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-0083708 (2005-03-17) |
등록번호 | US-9520972 (2016-12-13) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 1 인용 특허 : 381 |
Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The pattern allows for improved receipt of the pilot symbols transmitted. In addition, schemes for improving the ability to multiplex pilot symbols without interference and/or biasing from differe
Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The pattern allows for improved receipt of the pilot symbols transmitted. In addition, schemes for improving the ability to multiplex pilot symbols without interference and/or biasing from different mobile stations over the same frequencies and in the same time slots.
1. A wireless communication apparatus, comprising: at least one antenna;a memory that stores: at least one time selective pilot pattern comprising first and second clusters of time selective pilot symbols, said at least one time selective pilot pattern corresponding to a plurality of pilot symbols l
1. A wireless communication apparatus, comprising: at least one antenna;a memory that stores: at least one time selective pilot pattern comprising first and second clusters of time selective pilot symbols, said at least one time selective pilot pattern corresponding to a plurality of pilot symbols located in pilot symbol clusters each of which comprises a plurality of contiguous pilot symbols spanning multiple frequency tones and one symbol period, wherein the first and second clusters of time selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of time selective pilot symbols is assigned to a maximum or minimum frequency of a hop region and none of the pilot symbols in the first and second clusters of time selective pilot symbols are assigned to a first or last symbol period of the hop region, andat least one frequency selective pilot pattern comprising first and second clusters of frequency selective pilot symbols, said at least one frequency selective pilot pattern corressponding to another plurality of pilot symbols located in pilot symbol clusters each of which comprises a plurality of contiguous pilot symbols spanning multiple symbol periods and one frequency subcarrier, wherein the first and second clusters of frequency selective pilot symbols have orthogonal pilot symbols , and wherein only one pilot symbol in each of the first and second clusters of frequency selective pilot symbols is assigned to the first or last symbol period of the hop region and none of the pilot symbols in the first and second clusters of frequency selective pilot symbols are assigned to the maximum or minimum frequency of the hop region; anda processor coupled with the at least one antenna and the memory, the processor configured to select one pilot pattern of the at least one time selective pilot pattern or the at least one frequency selective pilot pattern, wherein the processor is configured to place the pilot symbols of the selected pilot pattern close to the edges of the hop region according to a first order approximation of a communications channel. 2. The wireless communication apparatus of claim 1, wherein the at least one time selective pilot pattern comprises a plurality of time selective pilot patterns, the at least one frequency selective pilot pattern comprises a plurality of frequency selective pilot patterns, and wherein the processor is configured to select at least one of the plurality of time selective pilot patterns or at least one of the plurality of frequency selective pilot patterns. 3. The wireless communication apparatus of claim 1, wherein the processor is adapted to select a time selective pilot pattern or a frequency selective pilot pattern based upon a parameter. 4. The wireless communication apparatus of claim 3, wherein the parameter comprises a predetermined threshold. 5. The wireless communication apparatus of claim 3, wherein the parameter is dynamically updated in response to a signal received at the wireless communication apparatus. 6. The wireless communication apparatus of claim 3, wherein the parameter comprises a pre-determined optimization of the network in which the wireless communication apparatus is to operate. 7. The wireless communication apparatus of claim 1, wherein the memory further stores a plurality of sequences that are orthogonal to each other sequence of the plurality of sequences and wherein the processor is configured to selectively instruct multiplication of the pilot symbols of the pilot pattern with some of the sequences of the plurality of sequences prior to transmission of the pilot pattern. 8. The wireless communication apparatus of claim 7, wherein the memory further stores another plurality of sequences and wherein the processor is configured to selectively instruct multiplication of the pilot symbols of the pilot pattern with both some of the sequences of the plurality of sequences and some of the another plurality of sequences prior to transmission of the pilot pattern. 9. The wireless communication apparatus of claim 1, wherein the memory is adapted to store a frequency selective pilot pattern having quasi-orthogonal pilot symbols. 10. The wireless communication apparatus of claim 1, wherein the memory is adapted to store a time selective pilot pattern having quasi-orthogonal pilot symbols. 11. A method of pilot symbol transmission in a wireless communication system, comprising: obtaining information regarding channel conditions of a channel from at least one sector of a base station;determining a selectivity of the channel based upon the information;choosing a pattern of pilot symbols based upon the selectivity of the channel, wherein the pattern of pilot symbols is selected from at least one time selective pilot pattern comprising first and second clusters of time selective pilot symbols, said at least one time selective pilot pattern corresponding to a plurality of pilot symbols located in pilot symbol clusters each of which comprises a plurality of contiguous pilot symbols spanning multiple frequency tones and one symbol period, wherein the first and second clusters of time selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of time selective pilot symbols is assigned to a maximum or minimum frequency of a hop region and none of the pilot symbols in the first and second clusters of time selective pilot symbols are assigned to a first or last symbol period of the hop region, and at least one frequency selective pilot pattern comprising first and second clusters of frequency selective pilot symbols, said at least one frequency selective pilot pattern corresponding to another plurality of pilot symbols located in pilot symbol clusters each of which comprises a plurality of contiguous pilot symbols spanning multiple symbol periods and one frequency subcarrier, wherein the first and second clusters of frequency selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of frequency selective pilot symbols is assigned to the first or last symbol period of the hop region and none of the pilot symbols in the first and second clusters of frequency selective pilot symbols are assigned to the maximum or minimum frequency of the hop region; andplacing the pilot symbols of the selected pilot pattern close to the edges of the hop region according to a first order approximation of a communications channel. 12. The method of claim 11, wherein in the step of determining the selectivity of the channel the channel is classified as frequency selective or time selective. 13. H The method of claim 11, wherein in the step of determining the selectivity of the channel, a frequency selectivity and a time selectivity is determined. 14. The method of claim 11, wherein in the step of choosing the pattern of clustered pilot symbols the clustered pilot symbols are optimized for one or both frequency selective and time selective conditions. 15. The method of claim 11, further comprising transmitting information indicating the pattern of clustered pilot symbols to a plurality of users so that the users transmit pilot symbols according to the pattern to the sector of the base station. 16. A wireless communication apparatus capable of transmitting a plurality of symbols each of which is transmitted utilizing a frequency subcarrier of a group of contiguous frequency subcarriers that range from a minimum frequency to a maximum frequency and during a symbol period of a group of contiguous symbol periods that range from a first symbol period to a last symbol period, the wireless communication apparatus comprising: at least one antenna;a memory that stores a plurality of time selective pilot patterns comprising first and second clusters of time selective pilot symbols each comprising a plurality of clusters each of which comprises a plurality of contiguous pilot symbols located in pilot symbol clusters each of which comprises a plurality of contiguous pilot symbols spanning multiple frequency tones and one symbol period, wherein the first and second clusters of time selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of time selective pilot symbols is assigned to a maximum or minimum frequency of a hop region and none of the pilot symbols in the first and second clusters of time selective pilot symbols are assigned to a first or last symbol period of the hop region, and at least one frequency selective pilot pattern comprising first and second clusters of frequency selective pilot symbols, the at least one frequency selective pilot pattern corresponding to another plurality of pilot symbols located in pilot symbol clusters each of which comprises a plurality of contiguous pilot symbols spanning multiple symbol periods and one frequency subcarrier, wherein the first and second clusters of frequency selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of frequency selective pilot symbols is assigned to the first or last symbol period of the hop region and none of the pilot symbols in the first and second clusters of frequency selective pilot symbols are assigned to the maximum or minimum frequency of the hop region; anda processor coupled with the plurality of antennas and the memory, the processor configured to cause one pilot pattern of the plurality of pilot patterns to be transmitted from the at least one antenna during the group of contiguous symbol periods utilizing the group of contiguous frequency subcarriers, wherein the processor is configured to place the pilot pattern close to the edges of the hop region according to a first order approximation of a communications channel. 17. The wireless communication apparatus of claim 16, wherein the plurality of pilot patterns comprise at least one time selective pilot pattern and at least one frequency selective pilot pattern. 18. The wireless communication apparatus of claim 16, wherein the memory further stores a plurality of sequences that are orthogonal to each other sequence of the plurality of sequences and wherein the processor is configured to selectively instruct multiplication of the pilot symbols of the pilot pattern with some of the sequences of the plurality of sequences prior to decoding the pilot symbols. 19. The wireless communication apparatus of claim 16, wherein the memory further stores a plurality of sequences that are quasi-orthogonal to each other sequence of the plurality of sequences and wherein the processor is configured to selectively instruct multiplication of the pilot symbols of the pilot pattern with some of the sequences of the plurality of sequences prior to decoding the pilot symbols. 20. The wireless communication apparatus of claim 19, wherein the memory further stores another plurality of sequences and wherein the processor is configured to selectively instruct multiplication of the pilot symbols of the pilot pattern with both some of the sequences of the plurality of sequences and some of the another plurality of sequences prior to decoding the pilot symbols. 21. The wireless communication apparatus of claim 16, wherein the processor is configured to select selects the pilot pattern to be transmitted based upon an instruction received at the at least one antenna. 22. The wireless communication apparatus of claim 16, wherein the at least one antenna comprises a plurality of antennas and wherein the processor is configured to cause multiple pilot patterns of the plurality of pilot patterns to be transmitted from the multiple antennas during the group of contiguous symbol periods utilizing the group of contiguous frequency subcarriers. 23. The wireless communication apparatus of claim 22, wherein the memory further stores a plurality of sequences that are orthogonal to each other sequence of the plurality of sequences and wherein the processor is configured to selectively instruct multiplication of the pilot symbols of each of the multiple pilot pattern with a different sequences of the plurality of sequences prior to transmission of the multiple pilot patterns. 24. The wireless communication apparatus of claim 16, wherein the processor is configured to utilize one pilot pattern of the plurality of pilot patterns to decode multiple pilot symbol groups transmitted by a plurality of wireless devices and received at the at least one antenna. 25. A non-transitory computer readable medium encoded with computer executable instructions for reading a data packet for transmission in a wireless network, the data packet including a preamble portion that identifies a cluster pilot pattern having a plurality of time or frequency selective clusters to be transmitted by a receiver of the data packet including at least one each of a frequency-selective pilot pattern or a time-selective pilot pattern, wherein the time selective pattern comprises first and second clusters of time selective pilot symbols and the first and second clusters of time selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of time selective pilot symbols is assigned to a maximum or minimum frequency of a hop region and none of the pilot symbols in the first and second clusters of time selective pilot symbols are assigned to a first or last symbol period of the hop region, and wherein the frequency selective pilot pattern comprises first and second clusters of frequency selective pilot symbols and the first and second clusters of frequency selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of frequency selective pilot symbols is assigned to the first or last symbol period of the hop region and none of the pilot symbols in the first and second clusters of frequency selective pilot symbols are assigned to the maximum or minimum frequency of the hop region, and instructions for placing the symbols of the cluster pilot pattern close to the edges of the hop region according to a first order approximation of a communications channel. 26. The computer readable medium of claim 25, wherein the computer executable instructions are adapted to read a packet having a preamble portion that includes information as to which sequence of a plurality of orthogonal sequences available at a receiver is to be utilized by the receiver of the data packet to multiply the samples that comprise pilot symbols of the pilot pattern prior to transmission of the pilot symbols by the receiver of the data packet. 27. A non-transitory computer readable medium encoded with: computer executable instructions for pilot symbol transmission in a wireless communication system, the computer executable instructions comprising:instructions for obtaining information regarding channel conditions from at least a sector of a base station;instructions for determining, based upon the information, a selectivity of the channel;instructions for setting a pattern of pilot symbols having a plurality of time or frequency selective clusters based upon the selectivity of the channel, wherein the time selective pattern comprises first and second clusters of time selective pilot symbols and the first and second clusters of time selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of time selective pilot symbols is assigned to a maximum or minimum frequency of a hop region and none of the pilot symbols in the first and second clusters of time selective pilot symbols are assigned to a first or last symbol period of the hop region, and wherein the frequency selective pilot pattern comprises first and second clusters of frequency selective pilot symbols and the first and second clusters of frequency selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of frequency selective pilot symbols is assigned to the first or last symbol period of the hop region and none of the pilot symbols in the first and second clusters of frequency selective pilot symbols are assigned to the maximum or minimum frequency of the hop region; andinstructions for placing the pattern of pilot symbols close to the edges of the hop region according to a first order approximation of a communications channel. 28. A processing system comprising: an input port;an output port; andprocessing circuitry configured to: obtain information from an input port regarding channel conditions from at least a sector of a base station;determine, based upon the information, a selectivity of the channel;set a pattern of clustered pilot symbols having a plurality of time or frequency selective clusters based upon the selectivity of the channel and to output a selection of the set pattern of pilot symbols through the output port, wherein the time selective pattern comprises first and second clusters of time selective pilot symbols and the first and second clusters of time selective pilot symbols have orthogonal pilot symbol , and wherein only one pilot symbol in each of the first and second clusters of time selective pilot symbols is assigned to a maximum or minimum frequency of a hop region and none of the pilot symbols in the first and second clusters of time selective pilot symbols are assigned to a first or last symbol period of the hop region, and wherein the frequency selective pilot pattern comprises first and second clusters of frequency selective pilot symbols and the first and second clusters of frequency selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of frequency selective pilot symbols is assigned to the first or last symbol period of the hop region and none of the pilot symbols in the first and second clusters of frequency selective pilot symbols are assigned to the maximum or minimum frequency of the hop region; andplace the pilot pattern of pilot symbols close to the edges of the hop region according to a first order approximation of a communications channel. 29. A non-transitory computer-readable medium encoded with instructions for processing a communication signal, the instructions comprising code for: obtaining information regarding channel conditions from at least a sector of a base station;determining, based upon the information, a selectivity of the channel;setting a pattern of pilot symbols having a plurality of time or frequency selective clusters based upon the selectivity of the channel, wherein the time selective pattern comprises first and second clusters of time selective pilot symbols and the first and second clusters of time selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of time selective pilot symbols is assigned to a maximum or minimum frequency of a hop region and none of the pilot symbols in the first and second clusters of time selective pilot symbols are assigned to a first or last symbol period of the hop region, and wherein the frequency selective pilot pattern comprises first and second clusters of frequency selective pilot symbols and the first and second clusters of frequency selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of frequency selective pilot symbols is assigned to the first or last symbol period of the hop region and none of the pilot symbols in the first and second clusters of frequency selective pilot symbols are assigned to the maximum or minimum frequency of the hop region; andplacing the pattern of pilot symbols close to the edges of the hop region according to a first order approximation of a communications channel.
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