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-0431969 (2006-05-10) |
등록번호 | US-8885628 (2014-11-11) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 28 인용 특허 : 370 |
In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA (LFDMA), a transmitter generates modulation symbols for different types of data (e.g., traffic data, signaling, and pilot) and performs code division multiplexing (CDM) on
In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA (LFDMA), a transmitter generates modulation symbols for different types of data (e.g., traffic data, signaling, and pilot) and performs code division multiplexing (CDM) on at least one data type. For example, the transmitter may apply CDM on signaling and/or pilot sent on frequency subbands and symbol periods that are also used by at least one other transmitter. To apply CDM to a given data type (e.g., signaling), the transmitter performs spreading on the modulation symbols for that data type with an assigned spreading code. CDM may be applied across symbols, samples, samples and symbols, frequency subbands, and so on. The transmitter may perform scrambling after the spreading. The transmitter generates SC-FDMA symbols of the same or different symbol durations for traffic data, signaling, and pilot and transmits the SC-FDMA symbols.
1. An apparatus for wireless communication, comprising: a processor operative to generate a modulation symbol for control information, to spread the modulation symbol for the control information with a spreading code by replicating the modulation symbol L times and multiplying the replicated modulat
1. An apparatus for wireless communication, comprising: a processor operative to generate a modulation symbol for control information, to spread the modulation symbol for the control information with a spreading code by replicating the modulation symbol L times and multiplying the replicated modulation symbols with L chips of the spreading code to obtain L spread modulation symbols, where L is a length of the spreading code, and to generate at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols and a set of contiguous subcarriers used for transmission; anda memory coupled to the processor. 2. The apparatus of claim 1, wherein the processor is operative to perform spreading over at least one symbol period used by at least two transmitters for transmission. 3. The apparatus of claim 1, wherein the processor is operative to perform scrambling with a scrambling code. 4. The apparatus of claim 3, wherein different sectors are assigned different scrambling codes. 5. The apparatus of claim 1, wherein the processor is operative to perform spreading across symbols. 6. The apparatus of claim 1, wherein the processor is operative to generate L SC-FDMA symbols based on the L spread modulation symbols. 7. The apparatus of claim 1, wherein the processor is operative to generate an SC-FDMA symbol, to replicate the SC-FDMA symbol L times, and to multiply the replicated SC-FDMA symbols with the L chips of a-the spreading code. 8. The apparatus of claim 1, wherein the processor is operative to perform spreading across samples. 9. The apparatus of claim 1, wherein the processor is operative to generate a single SC-FDMA symbol based on the L spread modulation symbols. 10. The apparatus of claim 1, wherein the processor is operative to perform spreading across both symbols and samples. 11. The apparatus of claim 1, wherein the processor is operative to generate at least two SC-FDMA symbols based on the L spread modulation symbols. 12. The apparatus of claim 1, wherein the processor is operative to perform spreading across subcarriers. 13. The apparatus of claim 1, wherein at least one other spreading code is not assigned to any transmitter and is reserved for interference estimation. 14. The apparatus of claim 1, wherein the processor is operative to generate modulation symbols for at least two types of data and to perform spreading for at least one type of data among the at least two types of data. 15. The apparatus of claim 1, wherein the processor is operative to generate modulation symbols for traffic data and control information and to perform spreading for control information. 16. The apparatus of claim 1, wherein the processor is operative to generate SC-FDMA symbols having at least two different durations. 17. The apparatus of claim 1, wherein the processor is operative to generate modulation symbols for traffic data and control information, to generate SC-FDMA symbols having a first duration for traffic data, and to generate SC-FDMA symbols having a second duration for control information, the second duration being shorter or longer than the first duration. 18. The apparatus of claim 1, wherein the processor is operative to generate modulation symbols for traffic data and pilot, to generate SC-FDMA symbols having a first duration for traffic data, and to generate SC-FDMA symbols having a second duration for pilot, the second duration being shorter or longer than the first duration. 19. The apparatus of claim 1, wherein the processor is operative to generate SC-FDMA symbols having a first duration for data sent without spreading and to generate SC-FDMA symbols having a second duration for data sent with spreading, the second duration being shorter or longer than the first duration. 20. The apparatus of claim 1, further comprising: a controller operative to determine different sets of subcarriers to use for transmission in different time slots based on a frequency hopping pattern. 21. A method of wireless communication, comprising: generating a modulation symbol for control information;spreading the modulation symbol for the control information with a spreading code by replicating the modulation symbol L times and multiplying the replicated modulation symbols with L chips of the spreading code to obtain L spread modulation symbols, where L is a length of the spreading code; andgenerating at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols and a set of contiguous subcarriers used for transmission. 22. The method of claim 21, further comprising: performing scrambling with a scrambling code. 23. The method of claim 21, wherein the spreading comprises spreading the modulation symbol with the spreading code across symbols, or across samples, or across subcarriers, or a combination thereof. 24. The method of claim 21, wherein the spreading comprises spreading the modulation symbol with the spreading code for at least one type of data among at least two types of data being transmitted. 25. The method of claim 21, further comprising: generating SC-FDMA symbols having at least two different durations for at least two types of data being transmitted. 26. The method of claim 21, further comprising: performing spreading over at least one symbol period used by at least two transmitters for transmission. 27. The method of claim 21, wherein the generating the at least one SC-FDMA symbol comprises generating L SC-FDMA symbols based on the L spread modulation symbols. 28. The method of claim 21, wherein the generating the at least one SC-FDMA symbol comprises generating a single SC-FDMA symbol based on the L spread modulation symbols. 29. An apparatus for wireless communication, comprising: means for generating a modulation symbol for control information;means for spreading the modulation symbol for the control information with a spreading code by replicating the modulation symbol L times and multiplying the replicated modulation symbols with L chips of the spreading code to obtain L spread modulation symbols, where L is a length of the spreading code; andmeans for generating at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols and a set of contiguous subcarriers used for transmission. 30. The apparatus of claim 29, further comprising: means for performing scrambling with a scrambling code. 31. The apparatus of claim 29, wherein the means for spreading comprises means for spreading the modulation symbol with the spreading code across symbols, or across samples, or across subcarriers, or a combination thereof. 32. The apparatus of claim 29, wherein the means for spreading comprises means for spreading the modulation symbol with the spreading code for at least one type of data among at least two types of data being transmitted. 33. The apparatus of claim 29, further comprising: means for generating SC-FDMA symbols having at least two different durations for at least two types of data being transmitted. 34. The apparatus of claim 29, further comprising: means for performing spreading over at least one symbol period used by at least two transmitters for transmission. 35. The apparatus of claim 29, wherein the means for generating the at least one SC-FDMA symbol comprises means for generating L SC-FDMA symbols based on the L spread modulation symbols. 36. The apparatus of claim 29, wherein the means for generating the at least one SC-FDMA symbol comprises means for generating a single SC-FDMA symbol based on the L spread modulation symbols. 37. An apparatus for wireless communication, comprising: a processor operative to receive at least one single-carrier frequency division multiple access (SC-FDMA) symbol comprising control information, to perform SC-FDMA demodulation on the at least one received SC-FDMA symbol to obtain received symbols from a set of contiguous subcarriers used for transmission in at least one symbol period, and to despread the received symbols with L chips of a spreading code to recover a modulation symbol for the control information, where L is a length of the spreading code; anda memory coupled to the processor. 38. The apparatus of claim 37, wherein multiple transmitters transmit SC-FDMA symbols with spreading in the at least one symbol period assigned to the transmitters for transmission. 39. The apparatus of claim 37, wherein the processor is operative to perform despreading across symbols, or across samples, or across subcarriers, or a combination thereof. 40. The apparatus of claim 37, wherein the processor is operative to perform descrambling with a scrambling code. 41. The apparatus of claim 37, wherein the processor is operative to derive an interference estimate based on at least one other spreading code not assigned to any transmitter. 42. The apparatus of claim 41, wherein the processor is operative to perform data detection based on the interference estimate. 43. The apparatus of claim 41, wherein the processor is operative to derive a channel estimate and to perform data detection based on the channel estimate and the interference estimate. 44. The apparatus of claim 37, wherein the processor is operative to obtain despread symbols for multiple antennas, to combine the despread symbols across the multiple antennas, and to perform data detection after combining across the multiple antennas. 45. The apparatus of claim 37, wherein the processor is operative to perform receiver spatial processing for SC-FDMA symbols transmitted without spreading by at least two transmitters in a symbol period. 46. The apparatus of claim 37, further comprising: a controller operative to determine different sets of subcarriers used for transmission in different time slots based on a frequency hopping pattern. 47. The apparatus of claim 37, wherein the processor is operative to perform SC-FDMA demodulation on L received SC-FDMA symbols to obtain received symbols for L symbol periods, and to despread the received symbols with the L chips of the spreading code to recover the modulation symbol. 48. The apparatus of claim 37, wherein the processor is operative to perform SC-FDMA demodulation on a single received SC-FDMA symbol to obtain received symbols for L sample periods or L subcarriers, and to despread the received symbols with the L chips of the spreading code to recover the modulation symbol. 49. A method of wireless communication, comprising: receiving at least one single-carrier frequency division multiple access (SC-FDMA) symbol comprising control information;performing SC-FDMA demodulation on the at least one received SC-FDMA symbol to obtain received symbols from a set of contiguous subcarriers used for transmission in at least one symbol period; anddespreading the received symbols with L chips of a spreading code to recover a modulation symbol for the control information, where L is a length of the spreading code. 50. The method of claim 49, wherein the despreading comprises despreading the received symbols with the spreading code across symbols, or across samples, or across subcarriers, or a combination thereof 51. The method of claim 49, further comprising: performing descrambling with a scrambling code. 52. The method of claim 49, further comprising: deriving an interference estimate based on at least one other spreading code not assigned to any transmitter. 53. The method of claim 49, wherein the performing SC-FDMA demodulation comprises performing SC-FDMA demodulation on L received SC-FDMA symbols to obtain received symbols for L symbol periods, and wherein the despreading comprises despreading the received symbols for the L symbol periods with the L chips of the spreading code to recover the modulation symbol. 54. The method of claim 49, wherein the performing SC-FDMA demodulation comprises performing SC-FDMA demodulation on a single received SC-FDMA symbol to obtain received symbols for L sample periods or L subcarriers, and wherein the despreading comprises despreading the received symbols for the L sample periods or the L subcarriers with the L chips of the spreading code to recover the modulation symbol. 55. An apparatus for wireless communication, comprising: means for receiving at least one single-carrier frequency division multiple access (SC-FDMA) symbol comprising control information;means for performing SC-FDMA demodulation on the at least one received SC-FDMA symbol to obtain received symbols from a set of contiguous subcarriers used for transmission in at least one symbol period; andmeans for despreading the received symbols with L chips of a spreading code to recover a modulation symbol for the control information, where L is a length of the spreading code. 56. The apparatus of claim 55, further comprising: means for performing descrambling with a scrambling code. 57. The apparatus of claim 55, wherein the means for despreading comprises means for despreading the received symbols with the spreading code across symbols, or across samples, or across subcarriers, or a combination thereof. 58. The apparatus of claim 55, further comprising: means for deriving an interference estimate based on at least one other spreading code not assigned to any transmitter. 59. The apparatus of claim 55, wherein the means for performing SC-FDMA demodulation comprises means for performing SC-FDMA demodulation on L received SC-FDMA symbols to obtain received symbols for L symbol periods, and wherein the means for despreading comprises means for despreading the received symbols for the L symbol periods with the L chips of the spreading code to recover the modulation symbol. 60. The apparatus of claim 55, wherein the means for performing SC-FDMA demodulation comprises means for performing SC-FDMA demodulation on a single received SC-FDMA symbol to obtain received symbols for L sample periods or L subcarriers, and wherein the means for despreading comprises means for despreading the received symbols for the L sample periods or the L subcarriers with the L chips of the spreading code to recover the modulation symbol. 61. A non-transitory computer-readable medium comprising: code for causing at least one processor to generate a modulation symbol for control information,code for causing the at least one processor to spread the modulation symbol for the control information with a spreading code by replicating the modulation symbol L times and multiplying the replicated modulation symbols with L chips of the spreading code to obtain L spread modulation symbols, where L is a length of the spreading code, andcode for causing the at least one processor to generate at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols and a set of contiguous subcarriers used for transmission. 62. A non-transitory computer-readable medium comprising: code for causing at least one processor to receive at least one single-carrier frequency division multiple access (SC-FDMA) symbol comprising control information,code for causing the at least one processor to perform SC-FDMA demodulation on the at least one received SC-FDMA symbol to obtain received symbols from a set of contiguous subcarriers used for transmission in at least one symbol period, andcode for causing the at least one processor to despread the received symbols with L chips of a spreading code to recover a modulation symbol for the control information, where L is a length of the spreading code.
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