Joint interference cancellation of pilot, overhead and traffic channels
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-001/00
H04B-015/00
출원번호
US-0193546
(2005-07-29)
등록번호
US-8406695
(2013-03-26)
발명자
/ 주소
Hou, Jilei
Pfister, Henry David
Smee, John Edward
Tomasin, Stefano
출원인 / 주소
QUALCOMM Incorporated
대리인 / 주소
Patel, Rupit M.
인용정보
피인용 횟수 :
8인용 특허 :
118
초록
A method and system for interference cancellation (IC). One aspect relates to traffic interference cancellation. Another aspect relates to joint IC for pilot, overhead and data. Another aspect relates to improved channel estimation. Another aspect relates to adaptation of transmit subchannel gains.
대표청구항▼
1. A method, comprising: receiving samples of signals transmitted from a plurality of access terminals;comparing demodulated outputs of an overhead channel with a threshold, wherein the overhead channel comprises at least one of a Reverse Rate Indicator (RRI) channel, Data Request Control (DRC) chan
1. A method, comprising: receiving samples of signals transmitted from a plurality of access terminals;comparing demodulated outputs of an overhead channel with a threshold, wherein the overhead channel comprises at least one of a Reverse Rate Indicator (RRI) channel, Data Request Control (DRC) channel, and Data Source Control (DSC) channel;if the demodulated outputs of the overhead channel are above the threshold, decoding the overhead channel with a symbol-based maximum-likelihood detector;using decoded overhead channel bits to reconstruct the overhead channel;canceling overhead channel data from the received samples; andafter canceling the overhead channel data, processing the samples to obtain traffic data sent by at least one of the access terminals. 2. The method of claim 1, wherein the signals comprise Code Division Multiple Access (CDMA) signals. 3. The method of claim 1, further comprising storing the received samples in a buffer and canceling the overhead channel data from the stored, received samples. 4. The method of claim 1, wherein the overhead channel comprises an Acknowledge (ACK) channel. 5. The method of claim 1, wherein the overhead channel comprises at least one of at least one of a dedicated physical control channel (DPCCH), an enhanced dedicated physical control channel (E-DPCCH), or a high-speed dedicated physical control channel (HS-DPCCH). 6. The method of claim 1, wherein the traffic data is sent by one or more users in at least one of an EV-DO Release 0 format or an EV-DO Revision A format. 7. The method of claim 1, wherein the traffic data is sent by one or more users in at least one of a dedicated physical data channel (DPDCH) format or an enhanced dedicated physical data channel (E-DPDCH) format. 8. The method of claim 1, wherein the overhead channel comprises an auxiliary pilot channel, the method further comprising reconstructing the auxiliary pilot channel based on a channel estimate. 9. A method, comprising: receiving samples of signals transmitted from a plurality of access terminals;reconstructing an overhead channel by: scaling each decoded overhead signal by a gain;covering the scaled, decoded overhead signal by a Walsh code;summing a plurality of covered, scaled, decoded overhead signals;spreading the summed, covered, scaled, decoded overhead signals by a pseudo-random noise (PN) seguence; andfiltering the spread, summed, covered, scaled, and decoded overhead signals through a channel-scaled filter;canceling overhead channel data from the received samples; andafter canceling the overhead channel data, processing the samples to obtain traffic data sent by at least one of the access terminals. 10. The method of claim 9, wherein the signals comprise Code Division Multiple Access (CDMA) signals. 11. The method of claim 9, further comprising storing the received samples in a buffer and canceling the overhead channel data from the stored, received samples. 12. The method of claim 9, wherein the overhead channel comprises an Acknowledge (ACK) channel. 13. The method of claim 9, wherein the overhead channel comprises at least one of at least one of a dedicated physical control channel (DPCCH), an enhanced dedicated physical control channel (E-DPCCH), or a high-speed dedicated physical control channel (HS-DPCCH). 14. The method of claim 9, wherein the traffic data is sent by one or more users in at least one of an EV-DO Release 0 format or an EV-DO Revision A format. 15. The method of claim 9, wherein the traffic data is sent by one or more users in at least one of a dedicated physical data channel (DPDCH) format or an enhanced dedicated physical data channel (E-DPDCH) format. 16. The method of claim 9, wherein the overhead channel comprises an auxiliary pilot channel, the method further comprising reconstructing the auxiliary pilot channel based on a channel estimate. 17. A method, comprising: receiving samples of signals transmitted from a plurality of access terminals, the samples comprising pilot channel data, overhead channel data and traffic channel data; andcanceling at least a portion of the pilot channel data, overhead channel data and traffic channel data in the samples by: determining channel estimates for the plurality of access terminals;using the channel estimates to cancel pilot channel data in the samples from all access terminals;selecting a set of one or more access terminals from the plurality of access terminals;for the set of one or more access terminals, demodulating and decoding overhead channel data and traffic channel data;determining which overhead channel data and traffic channel data decoded correctly;for the correctly decoded overhead channel data and traffic channel data, reconstructing overhead channel data and traffic channel data; andcanceling at least a portion of the reconstructed overhead channel data and traffic channel data in the samples. 18. The method of claim 17, wherein the signals comprise Code Division Multiple Access (CDMA) signals. 19. The method of claim 17, further comprising storing the received samples in a buffer and canceling the portion of pilot channel data, overhead channel data and traffic channel data in the stored, received samples. 20. The method of claim 17, wherein the decoding, reconstructing and canceling occurs in a sequential manner for one access terminal then another access terminal. 21. The method of claim 17, further comprising selecting another set of one or more access terminals from the plurality of access terminals and repeating said demodulating, decoding, reconstructing and canceling. 22. The method of claim 17, further comprising controlling transmit power of the access terminals based on the determined channel estimates. 23. The method of claim 17, wherein the selected set of one or more access terminals have a packet terminate at a current slot boundary. 24. The method of claim 17, further comprising storing the received samples in a buffer and canceling at least a portion of the pilot channel data, overhead channel data and traffic channel data in the stored, received samples. 25. The method of claim 17, further comprising: deriving a refined channel estimate; andbased on the refined channel estimate, removing a revised estimate of interference from at least one of the pilot channel data, overhead channel data and traffic channel data. 26. The method of claim 17, further comprising removing a residual pilot based on a refined channel estimate. 27. A method, comprising: receiving samples of signals transmitted from a plurality of access terminals, the samples comprising pilot channel data, overhead channel data and traffic channel data; andcanceling at least a portion of the pilot channel data, overhead channel data and traffic channel data in the samples by: determining channel estimates for the plurality of access terminals;selecting a set of one or more access terminals from the plurality of access terminals;for the set of one or more access terminals, re-estimating channel estimates from the pilot channel data;for the set of one or more access terminals, demodulating and decoding overhead channel data;for the set of one or more access terminals, demodulating and decoding traffic channel data;determining which overhead channel data and traffic channel data decoded correctly;for access terminals whose traffic channel data was successfully decoded, reconstructing pilot channel data, overhead channel data and traffic channel data; andcanceling at least a portion of the reconstructed pilot channel data, overhead channel data and traffic channel data in the samples. 28. The method of claim 27, further comprising storing the received samples in a buffer and canceling at least a portion of the pilot channel data, overhead channel data and traffic channel data in the stored, received samples. 29. The method of claim 27, further comprising selecting another set of one or more access terminals from the plurality of access terminals and repeating said demodulating, decoding, reconstructing and canceling. 30. The method of claim 27, wherein the decoding, reconstructing and canceling occurs in a sequential manner for one access terminal then another access terminal. 31. The method of claim 27, further comprising controlling transmit power of the access terminals based on the determined channel estimates. 32. The method of claim 27, wherein the selected set of one or more access terminals have a packet terminate at a current slot boundary. 33. The method of claim 27, further comprising: deriving a refined channel estimate; andbased on the refined channel estimate, removing a revised estimate of interference from at least one of the pilot channel data, overhead channel data and traffic channel data. 34. The method of claim 27, further comprising removing a residual pilot based on a refined channel estimate. 35. A base station comprising: a memory configured to store data samples of signals received from a plurality of access terminals, the samples comprising pilot channel data, overhead channel data and traffic channel data;a channel estimator configured to determine channel estimates for the plurality of access terminals;a selector configured to select a set of one or more access terminals from the plurality of access terminals;a demodulator configured to demodulate overhead channel data and traffic channel data for the selected set of one or more access terminals;a decoder configured to decode demodulated overhead channel data and traffic channel data and determine which overhead channel data and traffic channel data decoded correctly;a reconstruction unit configured to reconstruct overhead channel data and traffic channel data for the correctly decoded overhead channel data and traffic channel data, the reconstruction unit being further configured to reconstruct pilot channel data using the channel estimates; anda subtractor configured to subtract at least a portion of the reconstructed pilot channel data, reconstructed overhead channel data, and reconstructed traffic channel data from the samples stored in the memory. 36. The base station of claim 35, wherein the demodulator comprises a rake receiver with a plurality of finger processing units to process multipath signals, each finger processing unit having a unique delay to process samples from the memory. 37. The base station of claim 35, wherein the reconstruction unit is configured to reconstruct data by at least one of re-encoding, re-interleaving, re-modulating, re-applying a data channel gain, and re-spreading. 38. A computer-readable medium storing a software program executable by one or more processors, comprising: means for receiving samples of signals transmitted from a plurality of access terminals;means for comparing demodulated outputs of an overhead channel with a threshold, wherein the overhead channel comprises at least one of a Reverse Rate Indicator (RRI) channel, Data Request Control (DRC) channel, and Data Source Control (DSC) channel;means for decoding the overhead channel with a symbol-based maximum-likelihood detector, if the demodulated outputs of the overhead channel are above the threshold;means for using decoded overhead channel bits to reconstruct the overhead channel;means for canceling overhead channel data from the received samples; andmeans for processing the samples to obtain traffic data sent by at least one of the access terminals, after canceling the overhead channel data. 39. The computer-readable medium of claim 38, wherein the signals comprise Code Division Multiple Access (CDMA) signals. 40. The computer-readable medium of claim 38, further comprising means for storing the received samples in a buffer and means for canceling the overhead channel data from the stored, received samples. 41. The computer-readable medium of claim 38, wherein the overhead channel comprises an Acknowledge (ACK) channel. 42. The computer-readable medium of claim 38, wherein the overhead channel comprises at least one of at least one of a dedicated physical control channel (DPCCH), an enhanced dedicated physical control channel (E-DPCCH), or a high-speed dedicated physical control channel (HS-DPCCH). 43. The computer-readable medium of claim 38, wherein the traffic data is sent by one or more users in at least one of an EV-DO Release 0 format or an EV-DO Revision A format. 44. The computer-readable medium of claim 38, wherein the traffic data is sent by one or more users in at least one of a dedicated physical data channel (DPDCH) format or an enhanced dedicated physical data channel (E-DPDCH) format. 45. The computer-readable medium of claim 38, wherein the overhead channel comprises an auxiliary pilot channel, the computer-readable medium further comprising means for reconstructing the auxiliary pilot channel based on a channel estimate. 46. A system, comprising: means for receiving samples of signals transmitted from a plurality of access terminals;means for comparing demodulated outputs of an overhead channel with a threshold, wherein the overhead channel comprises at least one of a Reverse Rate Indicator (RRI) channel, Data Request Control (DRC) channel, and Data Source Control (DSC) channel;means for decoding the overhead channel with a symbol-based maximum-likelihood detector, if the demodulated outputs of the overhead channel are above the threshold;means for using decoded overhead channel bits to reconstruct the overhead channel;means for canceling overhead channel data from the received samples; andmeans for processing the samples to obtain traffic data sent by at least one of the access terminals, after canceling the overhead channel data. 47. The system of claim 46, wherein the signals comprise Code Division Multiple Access (CDMA) signals. 48. The system of claim 46, further comprising means for storing the received samples in a buffer and means for canceling the overhead channel data from the stored, received samples. 49. The system of claim 46, wherein the overhead channel comprises an Acknowledge (ACK) channel. 50. The system of claim 46, wherein the overhead channel comprises at least one of at least one of a dedicated physical control channel (DPCCH), an enhanced dedicated physical control channel (E-DPCCH), or a high-speed dedicated physical control channel (HS-DPCCH). 51. The system of claim 46, wherein the traffic data is sent by one or more users in at least one of an EV-DO Release 0 format or an EV-DO Revision A format. 52. The system of claim 46, wherein the traffic data is sent by one or more users in at least one of a dedicated physical data channel (DPDCH) format or an enhanced dedicated physical data channel (E-DPDCH) format. 53. The system of claim 46, wherein the overhead channel comprises an auxiliary pilot channel, the system further comprising means for reconstructing the auxiliary pilot channel based on a channel estimate.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (118)
Dalgleish, Robert; Kendall, Martin, Adaptive forward power management algorithm for traffic hotspots.
Heo,Seo Weon; Ahn,Seong Woo; Bae,Sang Min, Apparatus and method for canceling interference signals in a receiver for a packet data communication system.
Li,Jianjun; Kim,Sung Jin, Apparatus and method for generating and receiving traffic in a block spreading code division multiple access mobile communication system.
Kim, Sung-Jin; Kwak, Byung-Jae; Lee, Yong-Suk; Park, Seong-Ill; Choi, Ho-Kyu; Kim, Min-Koo; Kim, Beong-Jo; Lee, Hyun-Woo; Kim, Jae-Yoel; Park, Sang-Hwan, Apparatus and method for transmission diversity using more than two antennas.
Blakeney ; II Robert D. (San Diego CA) Weaver ; Jr. Lindsay A. (Boulder CO) Ziv Noam A. (San Diego CA) Williamson Paul T. (San Diego CA) Padovani Roberto (San Diego CA), Demodulation element assignment in a system capable of receiving multiple signals.
van Heeswyk Frank Martin,CAX ; Newson Paul,CAX, Interference cancellation system and method and CDMA receiver including an interference cancellation circuit.
Levin,Jeffrey A.; Wilborn,Thomas B.; Butler,Brian K.; Bender,Paul E., Method and apparatus for canceling pilot interference in a wireless communication system.
Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
Bergstrom Chad Scott ; Chuprun Jeffrey Scott ; Kleider John Eric ; Guzek Amy Michelle, Method and apparatus for performing interference suppression using modal moment estimates.
Holtzman, Jack; Chen, Tao, Method and apparatus for predicting favored supplemental channel transmission slots using transmission power measurements of a fundamental channel.
Willenegger,Serge; Malladi,Durga P.; Blanz,Josef J., Method and apparatus for reducing inter-channel interference in a wireless communication system employing a non-periodic interleaver.
Willenegger,Serge; Vayanos,Alkinoos Hector; Malladi,Durga P.; Tiedemann, Jr.,Edward G.; Grilli,Francesco; Blanz,Josef, Method and apparatus for reducing interference in a wireless communication system.
Chen, Tao; Wolf, Jack K.; Odenwalder, Joseph P.; Tiedemann, Jr., Edward G.; Butler, Brian K.; Wei, Yongbin, Method and system for utilization of an outer decoder in a broadcast services communication system.
Baier,Paul Walter; Weckerle,Martin; Haardt,Martin, Method for obtaining information regarding interference in the receiver of a message transmission system.
Rouphael, Antoine J.; Hoffmann, John E.; Nelson, Jr., George Rodney; Proctor, Jr., James A., Method for using a non-orthogonal pilot signal with data channel interference cancellation.
Ranta Pekka,FIX ; Jolma Petri,FIX ; Gandini Giulio,FIX ; Honkasalo Zhichun,FIX, Method of allocating frequency bands to different cells, and TDMA cellular radio system.
Chennakeshu Sandeep ; Ramesh Rajaram ; Bottomley Gregory E. ; Dent Paul W., Methods and apparatus for canceling adjacent channel signals in digital communications systems.
Willenegger, Serge; Chen, Tao; Vayanos, Alkinoos Hector; Wei, Yongbin, Multi-media broadcast and multicast service (MBMS) in a wireless communication system.
Willenegger, Serge; Chen, Tao; Vayanos, Alkinoos Hector; Wei, Yongbin, Multi-media broadcast and multicast service (MBMS) in a wireless communication system.
Willenegger,Serge; Chen,Tao; Vayanos,Alkinoos Hector; Wei,Yongbin, Multi-media broadcast and multicast service (MBMS) in a wireless communications system.
Huang Howard C. ; I Chih-Lin ; Brink Stephan ten,DEX ; Vannucci Giovanni, Pilot interference cancellation for a coherent wireless code division multiple access receiver.
Sugimoto, Hiroki; Lim, Teng Joon; Rasmussen, Lars; Cheah, Kok Leong; Sun, Sumei; Matsumoto, Yoshihiro; Oyama, Takashi, Receiving device and channel estimator for use in a CDMA communication system.
Seki Hiroyuki,JPX ; Tanaka Yoshinori,JPX ; Kobayakawa Shuji,JPX ; Toda Takeshi,JPX ; Tsutsui Masafumi,JPX, Signal to interference power ratio measuring apparatus and signal to interference power ratio measuring method as well as transmission power controlling method under CDMA communication system.
Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Weaver ; Jr. Lindsay A. (San Diego CA), Spread spectrum multiple access communication system using satellite or terrestrial repeaters.
Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Padovani Roberto (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA) Wheatley ; III Charles E. (Del Mar CA) Viterbi Andrew J. (La Jol, System and method for generating signal waveforms in a CDMA cellular telephone system.
Gilhousen, Klein S.; Jacobs, Irwin M.; Padovani, Roberto; Weaver, Jr., Lindsay A.; Wheatley, III, Charles E.; Viterbi, Andrew J., System and method for generating signal waveforms in a CDMA cellular telephone system.
Oates,John H., Wireless communication systems and methods for long-code communications for regenerative multiple user detection involving implicit waveform subtraction.
Oates,John H., Wireless communication systems and methods for long-code communications for regenerative multiple user detection involving pre-maximal combination matched filter outputs.
Coralli, Alessandro Vanelli; Pfister, Henry David; Hou, Jilei; Smee, John Edward; Padovani, Roberto; Butler, Brian K.; Levin, Jeffrey A.; Wilborn, Thomas B.; Bender, Paul E., Method and apparatus for canceling pilot interference in a wireless communication system.
Coralli, Alessandro Vanelli; Pfister, Henry David; Hou, Jilei; Smee, John Edward; Padovani, Roberto; Butler, Brian K; Levin, Jeffrey A; Wilborn, Thomas B; Bender, Paul E, Method and apparatus for canceling pilot interference in a wireless communication system.
Kim, Hak Seong; Seo, Han Byul; Lee, Dae Won; Kim, Ki Jun, Method and apparatus for reducing inter-cell interference in a wireless communication system.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.