최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0173504 (2005-06-30) |
등록번호 | US-8611311 (2013-12-17) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 1 인용 특허 : 109 |
Methods and systems for estimating and canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interf
Methods and systems for estimating and canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence. The pilot interference estimates due to a plurality of interfering multipaths are accumulated to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.
1. A receiver unit configured to receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the receiver unit comprising: a processor configured to:determine a first channel estimate for the first signal instance;use the
1. A receiver unit configured to receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the receiver unit comprising: a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance; anda buffer configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance,wherein the buffer is further configured to accumulate (a) the estimated first pilot according to a first estimated time offset of the first signal instance and (b) the estimated second pilot according to a second estimated time offset of the second signal instance. 2. A receiver unit configured to receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the receiver unit comprising: a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance;a buffer configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance, anda sample buffer configured to store the wireless signal at a sample rate equal to a multiple of a chip rate of the wireless signal. 3. The receiver unit of claim 2, wherein the sample rate of the sample buffer is equal to a sample rate of the buffer accumulating the estimated pilots. 4. A receiver unit configured to: receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the receiver unit comprising: a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance; anda buffer configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance, and wherein the processor is further configured to:determine a first noise estimate of the first signal instance;derive a cancellation factor a based on the first channel estimate and the first noise estimate;multiply the first channel estimate by the cancellation factor to produce a weighted channel estimate; anduse the weighted channel estimate and the spread pilot signal associated with the first signal instance to estimate the first pilot of the first signal instance. 5. The receiver unit of claim 4, wherein the cancellation factor a is derived from: α=[(h2/Nt)×N][1+(h2/Nt)×N]where h is the first channel estimate, Nt is the first noise estimate, and N is a number of samples used to estimate h and Nt of the first signal instance. 6. The receiver unit of claim 4, wherein the cancellation factor ranges from 0 to 1.0. 7. The receiver unit of claim 4, wherein the cancellation factor ranges from 0 to a value greater than 1.0. 8. The receiver unit of claim 4, further comprising a look-up table with sets of channel estimates and noise estimates corresponding to cancellation factors. 9. A receiver unit configured to receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the receiver unit comprising: a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance; anda buffer configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance, wherein the processor is further configured to:multiply the first channel estimate by a convolution of a transmit pulse and a receive filter function; andperform a convolution of (a) the spread pilot signal associated with the first signal instance and (b) a product of the first channel estimate and the convolution of the transmit pulse and the receive filter function to estimate the first pilot of the first signal instance. 10. The receiver unit of claim 9, wherein the transmit pulse is defined by a Code Division Multiple Access (CDMA) standard. 11. The receiver unit of claim 9, wherein the processor is configured to downsample a rate of at least one of (a) the convolution of the transmit pulse and the receive filter function, and (b) the convolution of (i) the spread pilot signal associated with the first signal instance and (ii) the product of the first channel estimate and the convolution of the transmit pulse and the receive filter function to match a rate of the buffer. 12. The receiver unit of claim 9, wherein the processor is configured to upsample a rate of at least one of (a) the convolution of the predetermined transmit pulse and the receive filter function, and (b) the convolution of (i) the spread pilot signal associated with the first signal instance and (ii) the product of the first channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function to match a rate of the buffer. 13. The receiver unit of claim 9, wherein the processor is configured to: decimate samples of the convolution of the pre-determined transmit pulse and the receive filter function according to a phase associated with an estimated time offset of the first signal instance;multiply the first channel estimate by decimated samples of the convolution of the pre-determined transmit pulse and the receive filter function; andperform a convolution of the spread pilot signal associated with the first signal instance and the product of the first channel estimate and the decimated samples to estimate the first pilot of the first signal instance. 14. The receiver unit of claim 9, further comprising a polyphase finite impulse response filter (FIR) configured to: decimate samples of the convolution of the pre-determined transmit pulse and the receive filter function according to a phase associated with an estimated time offset of the first signal instance;multiply the first channel estimate by decimated samples of the convolution of the pre-determined transmit pulse and the receive filter function; andperform a convolution of the spread pilot signal associated with the first signal instance and the product of the first channel estimate and the decimated samples to estimate the first pilot of the first signal instance. 15. The receiver unit of claim 9, further comprising a filter table of pre-determined filter coefficients that correspond to a plurality of different phases, the processor being configured to select a phase and corresponding filter coefficients based on an estimated time offset of the first signal instance. 16. A receiver unit configured to: receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the receiver unit comprising:a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance; anda buffer configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance, and wherein the processor is configured to determine the first channel estimate and use the first channel estimate and spread pilot signal associated with the first signal instance to estimate the first pilot of the first signal instance substantially in parallel with determining the second channel estimate and using the second channel estimate and spread pilot signal associated with the second signal instance to estimate the second pilot of the second signal instance. 17. A communication system comprising: a base station configured to receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the base station comprising:a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance; anda memory configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance, wherein the processor is further configured tomultiply the first channel estimate by a convolution of a pre-determined transmit pulse and a receive filter function; andperform a convolution of (a) a spread pilot signal associated with the first signal instance and (b) a product of the first channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function to estimate the first pilot of the first signal instance. 18. A communication system comprising: a base station configured to receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the base station comprising:a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance; anda memory configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance,wherein the base station comprises a plurality of antennas and a plurality of buffers in the memory, each buffer being configured to accumulate the estimated pilots of signal instances received by one of the antennas. 19. A communication system comprising: a base station configured to receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the base station comprising:a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance; anda memory configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance,wherein the base station comprises a plurality of antennas, the memory having a single buffer configured to accumulate the estimated pilots of signal instances received by the plurality of the antennas. 20. A communication system comprising: a base station configured to receive a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal, the base station comprising:a processor configured to:determine a first channel estimate for the first signal instance;use the first channel estimate and a spread pilot signal associated with the first signal instance to estimate a first pilot of the first signal instance;determine a second channel estimate for the second signal instance; anduse the second channel estimate and a spread pilot signal associated with the second signal instance to estimate a second pilot of the second signal instance; anda memory configured to accumulate the estimated first and second pilots, the processor being configured to subtract the accumulated, estimated first and second pilots from the received signal to estimate a pilot-canceled received signal, the processor being configured to use the estimated pilot-canceled received signal to demodulate data of the first signal instance,wherein the base station comprises X number of antennas and Y number of buffers in the memory, X being greater than Y, wherein at least one buffer is configured to accumulate estimated pilots of signal instances received by two or more antennas. 21. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots;subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal; andbuffering the received wireless signal at a sample rate equal to a multiple of a chip rate. 22. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein determining the first channel estimate for the first signal instance comprises:despreading samples of the received signal with a spreading sequence associated with the first signal instance to provide despread samples;de-channelizing the despread samples with a pilot channelization code to provide pilot symbols; andfiltering the pilot symbols to provide the first channel estimate. 23. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein determining the first channel estimate for the first signal instance uses a first segment of data samples from the received signal, the first estimated pilot corresponding to the first segment of data samples. 24. The method of claim 23, wherein the first segment comprises data samples for a time period of the received signal. 25. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots;subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal;determining a noise estimate of the first signal instance;deriving a cancellation factor based on the first channel estimate and the noise estimate of the first signal instance;multiplying the first channel estimate by the cancellation factor to produce a weighted channel estimate; andusing the weighted channel estimate and a spread pilot signal associated with the first signal instance to estimate the first pilot of the first signal instance. 26. The method of claim 25, wherein deriving the cancellation factor α uses: α=[(h2/Nt)×N][1+(h2/Nt)×N]where h is the first channel estimate, Nt is the noise estimate, and N is a number of samples used to estimate h and Nt for the first signal instance. 27. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots;subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal;decimating samples of the convolution of the pre-determined transmit pulse and the receive filter function according to a phase associated with an estimated time offset of the first signal instance;multiplying the first channel estimate by decimated samples of the convolution of the pre-determined transmit pulse and the receive filter function; andperforming a convolution of a spread pilot signal and the product of the first channel estimate and the decimated samples to estimate the first pilot of the first signal instance. 28. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots;subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal;electing a phase based on an estimated time offset of the first signal instance;using the selected phase to retrieve pre-determined filter coefficients, the pre-determined filter coefficients corresponding to the convolution of the pre-determined transmit pulse and the receive filter function; andmultiplying the first channel estimate by the retrieved filter coefficients. 29. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance; andaccumulating the estimated first and second pilots;subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein using the product of the first channel estimate and the convolution to estimate the first pilot of the first signal instance comprises performing a convolution of (a) the product of the channel estimate and the convolution and (b) a spread pilot signal associated with the first signal instance. 30. The method of claim 29, wherein the first channel estimate, the spread pilot signal associated with the first signal instance, and the first estimated pilot correspond to a first segment of the received signal, the first segment comprising data samples for a time period of the received signal. 31. The method of claim 29, wherein the spread pilot signal associated with the first signal instance has a phase corresponding to an arrival time of the first signal instance. 32. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots;subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal; andusing the estimated pilot-canceled received signal to demodulate data of the first signal instance,wherein using the estimated pilot-canceled received signal to demodulate data of the first signal instance comprises:despreading samples of the estimated pilot-canceled received signal with a spreading sequence for the first signal instance to provide despread samples;de-channelizing the despread samples with a data channelization code to provide data symbols; anddemodulating the data symbols with the first channel estimate for the first signal instance to provide demodulated data for the first signal instance. 33. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein determining the first channel estimate, deriving the product of the first channel estimate and the convolution, and using the product to estimate the first pilot of the first signal instance occurs substantially in parallel with determining the second channel estimate, deriving the product of the second channel estimate and the convolution, and using the product to estimate the second pilot of the second signal instance. 34. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein said determining the first channel estimate, deriving the product of the first channel estimate and the convolution, and using the product to estimate the first pilot of the first signal instance occurs in a time division multiplexed manner with determining the second channel estimate, deriving the product of the second channel estimate and the convolution, and using the product to estimate the second pilot of the second signal instance. 35. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein accumulating the estimated first and second pilots comprises accumulating (a) the estimated first pilot according to a first estimated time offset of the first signal instance and (b) the estimated second pilot according to a second estimated time offset of the second signal instance. 36. A method for canceling pilot interference in a wireless communication system, comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein accumulating the estimated first and second pilots occurs at a pre-determined sample rate, which is equal to a sample rate of the received signal. 37. The method of claim 36, wherein the sample rate is a multiple of a chip rate. 38. An apparatus for canceling pilot interference in a wireless communication system, comprising: means for receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;means for determining a first channel estimate for the first signal instance;means for deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;means for using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;means for determining a second channel estimate for the second signal instance;means for deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;means for using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;means for accumulating the estimated first and second pilots;means for subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal; andmeans for buffering the received wireless signal at a sample rate equal to a multiple of a chip rate. 39. An apparatus for canceling pilot interference in a wireless communication system, comprising: means for receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;means for determining a first channel estimate for the first signal instance;means for deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;means for using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;means for determining a second channel estimate for the second signal instance;means for deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;means for using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;means for accumulating the estimated first and second pilots; andmeans for subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein means for determining the first channel estimate for the first signal instance uses a first segment of data samples from the received signal, the first estimated pilot corresponding to the first segment of data samples. 40. An apparatus for canceling pilot interference in a wireless communication system, comprising: means for receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;means for determining a first channel estimate for the first signal instance;means for deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;means for using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;means for determining a second channel estimate for the second signal instance;means for deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;means for using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance; andmeans for accumulating the estimated first and second pilots;means for subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein means for using the product of the first channel estimate and the convolution to estimate the first pilot of the first signal instance comprises means for performing a convolution of (a) the product of the channel estimate and the convolution and (b) a spread pilot signal associated with the first signal instance. 41. An apparatus for canceling pilot interference in a wireless communication system, comprising: means for receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;means for determining a first channel estimate for the first signal instance;means for deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;means for using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;means for determining a second channel estimate for the second signal instance;means for deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;means for using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;means for accumulating the estimated first and second pilots; andmeans for subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein determining the first channel estimate, deriving the product of the first channel estimate and the convolution, and using the product to estimate the first pilot of the first signal instance occurs substantially in parallel with determining the second channel estimate, deriving the product of the second channel estimate and the convolution, and using the product to estimate the second pilot of the second signal instance. 42. An apparatus for canceling pilot interference in a wireless communication system, comprising: means for receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;means for determining a first channel estimate for the first signal instance;means for deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;means for using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;means for determining a second channel estimate for the second signal instance;means for deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;means for using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;means for accumulating the estimated first and second pilots; andmeans for subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein said determining the first channel estimate, deriving the product of the first channel estimate and the convolution, and using the product to estimate the first pilot of the first signal instance occurs in a time division multiplexed manner with determining the second channel estimate, deriving the product of the second channel estimate and the convolution, and using the product to estimate the second pilot of the second signal instance. 43. An apparatus for canceling pilot interference in a wireless communication system, comprising: means for receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;means for determining a first channel estimate for the first signal instance;means for deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;means for using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;means for determining a second channel estimate for the second signal instance;means for deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;means for using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;means for accumulating the estimated first and second pilots; andmeans for subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein means for accumulating the estimated first and second pilots comprises means for accumulating (a) the estimated first pilot according to a first estimated time offset of the first signal instance and (b) the estimated second pilot according to a second estimated time offset of the second signal instance. 44. An apparatus for canceling pilot interference in a wireless communication system, comprising: means for receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;means for determining a first channel estimate for the first signal instance;means for deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;means for using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;means for determining a second channel estimate for the second signal instance;means for deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;means for using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;means for accumulating the estimated first and second pilots; andmeans for subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein accumulating the estimated first and second pilots occurs at a pre-determined sample rate, which is equal to a sample rate of the received signal. 45. A non-transitory computer-readable medium, comprising codes for performing a method for canceling pilot interference in a wireless communication system, the method comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots;subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal; andbuffering the received wireless signal at a sample rate equal to a multiple of a chip rate. 46. A non-transitory computer-readable medium, comprising codes for performing a method for canceling pilot interference in a wireless communication system, the method comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein determining the first channel estimate for the first signal instance uses a first segment of data samples from the received signal, the first estimated pilot corresponding to the first segment of data samples. 47. A non-transitory computer-readable medium, comprising codes performing a method for canceling pilot interference in a wireless communication system, the method comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance; andaccumulating the estimated first and second pilots;subtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein using the product of the first channel estimate and the convolution to estimate the first pilot of the first signal instance comprises performing a convolution of (a) the product of the channel estimate and the convolution and (b) a spread pilot signal associated with the first signal instance. 48. A non-transitory computer-readable medium, comprising codes for performing a method for canceling pilot interference in a wireless communication system, the method comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein determining the first channel estimate, deriving the product of the first channel estimate and the convolution, and using the product to estimate the first pilot of the first signal instance occurs substantially in parallel with determining the second channel estimate, deriving the product of the second channel estimate and the convolution, and using the product to estimate the second pilot of the second signal instance. 49. A non-transitory computer-readable medium, comprising codes for performing a method for canceling pilot interference in a wireless communication system, the method comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein said determining the first channel estimate, deriving the product of the first channel estimate and the convolution, and using the product to estimate the first pilot of the first signal instance occurs in a time division multiplexed manner with determining the second channel estimate, deriving the product of the second channel estimate and the convolution, and using the product to estimate the second pilot of the second signal instance. 50. A non-transitory computer-readable medium, comprising codes for performing a method for canceling pilot interference in a wireless communication system, the method comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein accumulating the estimated first and second pilots comprises accumulating (a) the estimated first pilot according to a first estimated time offset of the first signal instance and (b) the estimated second pilot according to a second estimated time offset of the second signal instance. 51. A non-transitory computer-readable medium, comprising codes for performing a method for canceling pilot interference in a wireless communication system, the method comprising: receiving a wireless signal comprising at least first and second signal instances, each signal instance comprising data and a pilot signal;determining a first channel estimate for the first signal instance;deriving a product of the first channel estimate and a convolution of a pre-determined transmit pulse and a receive filter function;using the product of the first channel estimate and the convolution to estimate a first pilot of the first signal instance;determining a second channel estimate for the second signal instance;deriving a product of the second channel estimate and the convolution of the pre-determined transmit pulse and the receive filter function;using the product of the second channel estimate and the convolution to estimate a second pilot of the second signal instance;accumulating the estimated first and second pilots; andsubtracting the accumulated, estimated first and second pilots from the received signal to derive an estimated pilot-canceled received signal,wherein accumulating the estimated first and second pilots occurs at a pre-determined sample rate, which is equal to a sample rate of the received signal.
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