Methods and apparatus for configuring a pilot symbol in a wireless communication system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04L-027/20
H03K-007/04
H03K-007/06
H03K-009/04
H03K-009/06
H04L-027/18
출원번호
US-0535940
(2006-09-27)
등록번호
US-8391410
(2013-03-05)
발명자
/ 주소
Wang, Michael Mao
출원인 / 주소
QUALCOMM Incorporated
인용정보
피인용 횟수 :
7인용 특허 :
41
초록▼
Methods and apparatus for constructing a pilot symbol for a communication frame transmitted in a wireless communication system, such as an OFDM system, are disclosed. In particular, the methods and apparatus generate at least one pseudo-random noise sequence having at least a predetermined length, w
Methods and apparatus for constructing a pilot symbol for a communication frame transmitted in a wireless communication system, such as an OFDM system, are disclosed. In particular, the methods and apparatus generate at least one pseudo-random noise sequence having at least a predetermined length, where the at least one pseudo-random noise sequence represents a system configuration of a wireless system. A time domain symbol sequence is modulated with the at least one pseudo-random noise sequence to create a timing acquisition pilot symbol. The modulated acquisition pilot symbol is further masked to a prescribed frequency profile and placed in a frame for wireless transmission. Accordingly, different system configurations can be communicated from a transmitter to a receiver with the acquisition pilot symbol modulated with correspondingly different pseudo-random noise sequences, while affording low complexity required to process the acquisition pilot symbol and a minimum peak to average power ratio when using QPSK modulation.
대표청구항▼
1. A transmitter comprising: a pseudo-random noise sequence generator configured to generate a plurality of pseudo-random noise sequences including a C number of pseudo-random noise subsequences, each pseudo-random noise sequence representing a different corresponding system information to be commun
1. A transmitter comprising: a pseudo-random noise sequence generator configured to generate a plurality of pseudo-random noise sequences including a C number of pseudo-random noise subsequences, each pseudo-random noise sequence representing a different corresponding system information to be communicated to a receiver, each pseudo-random noise subsequence representing a corresponding configuration of a C number of different wireless system configurations;a modulator configured to construct an acquisition pilot symbol by modulating a time domain symbol sequence with one of the plurality of pseudo-random noise sequences;a spectrum mask unit configured to mask the acquisition pilot symbol to a prescribed frequency profile; andan assembly unit configured to place the modulated acquisition pilot symbol in a frame for wireless transmission. 2. A transmitter as defined in claim 1, wherein the time domain symbol sequence utilized by the modulator is a QPSK time domain symbol sequence. 3. A transmitter as defined in claim 1, wherein at least one pseudo-random noise sequence of the plurality of pseudo-random noise sequences is configured to have a length at least twice the length of the time domain symbol sequence. 4. A transmitter as defined in claim 1, further comprising: a fast Fourier transform unit configured to convert the acquisition pilot symbol modulated by the modulator to frequency domain for use by the spectrum mask unit. 5. A transmitter as defined in claim 4, further comprising: an inverse fast Fourier transform unit configured to convert the acquisition pilot symbol to frequency domain after the acquisition pilot symbol has been processed by the spectrum mask unit. 6. A transmitter, comprising: a pseudo-random noise sequence generator configured to generate a pseudo-random noise sequence that corresponds to predefined system information to be communicated to a receiver;a modulator configured to construct an acquisition pilot symbol by modulating a time domain symbol sequence with the pseudo-random noise sequence;a spectrum mask unit configured to mask the acquisition pilot symbol to a prescribed frequency profile; andan assembly unit configured to place the modulated acquisition pilot symbol in a frame for wireless transmission;wherein the pseudo-random noise sequence generator is further configured to generate a C number of pseudo-random noise sequence segments, where each of the c number of pseudo-random noise sequence segments represents a different corresponding particular wireless system configuration of a C number of different wireless system configurations;wherein the pseudo-random noise sequence generator is further configured to generate the C number of sequences by: establishing a maximum length pseudo-random noise sequence having a number of bits as determined by the relationship 1+[log2∑c=0C-1N(c)] where N is the length of the time domain symbol sequence and c represents one of the C number of sequences, the maximum length pseudo-random noise sequence having with a length of at least 2∑c=0C-1N(c); anddividing the maximum length pseudo-random noise sequence into c non-overlapping pseudo-random noise segments each having a length 2N. 7. A method for constructing an acquisition pilot symbol comprising: generating a plurality of pseudo-random noise sequences having at least a predetermined length including a C number of pseudo-random noise subsequences, each pseudo-random noise sequence representing a different corresponding system information, each pseudo-random noise subsequence representing a corresponding configuration of a C number of different wireless system configurations;modulating a time domain symbol sequence with one of the plurality of pseudo-random noise sequences to create an acquisition pilot symbol;masking the acquisition pilot symbol to a prescribed frequency profile; andplacing the modulated and masked acquisition pilot symbol in a frame for wireless transmission. 8. A method as defined in claim 7, wherein the time domain symbol sequence is a QPSK time domain symbol sequence. 9. A method as defined in claim 7, wherein at least one pseudo-random noise sequence of the plurality of pseudo-random noise sequences is configured to have a length at least twice the length of the time domain symbol sequence. 10. A method as defined in claim 7, further comprising: converting the modulated acquisition pilot symbol to frequency domain with a fast Fourier transform prior to masking. 11. A method as defined in claim 10, further comprising: converting the acquisition pilot symbol to frequency domain using a inverse fast Fourier transform after the acquisition pilot symbol has been masked. 12. A method for constructing an acquisition pilot symbol, comprising: generating at least one pseudo-random noise sequence having at least a predetermined length, where the at least one pseudo-random noise sequence represents a system configuration of a wireless system;modulating a time domain symbol sequence with the at least one pseudo-random noise sequence to create an acquisition pilot symbol;masking the acquisition pilot symbol to a prescribed frequency profile; andplacing the modulated and masked acquisition pilot symbol in a frame for wireless transmission;wherein generating the at least one pseudo-random noise sequence includes generating a C number of pseudo-random noise sequence segments, where each of the C number of pseudo-random noise sequence segments represents a different corresponding particular wireless system configuration of a C number of different wireless system configurations;wherein generating the C number of pseudo-random noise sequences further includes: establishing a maximum length pseudo-random noise sequence having a number of bits as determined by the relationship 1+[log2∑c=0C-1N(c)] where N is the length of the time domain symbol sequence and c represents one of the C number of sequences, the maximum length pseudo-random noise sequence having with a length of at least 2∑c=0C-1N(c); anddividing the maximum length pseudo-random noise sequence into C non-overlapping PN segments each having a length 2N. 13. A processor for use in a wireless communication device comprising: a pseudo-random noise sequence generator configured to generate a plurality of pseudo-random noise sequences including a C number of pseudo-random noise subsequences, each pseudo-random noise sequence representing a different corresponding system information to be communicated to a receiver, each pseudo-random noise subsequence representing a corresponding configuration of a C number of different wireless system configurations;a modulator configured to construct an acquisition pilot symbol by modulating a time domain symbol sequence with one of the plurality of pseudo-random noise sequences;a spectrum mask unit configured to mask the acquisition pilot symbol to a prescribed frequency profile; andan assembly unit configured to place the modulated acquisition pilot symbol in a frame for wireless transmission. 14. A processor as defined in claim 13, wherein the time domain symbol sequence utilized by the modulator is a QPSK time domain symbol sequence. 15. A processor as defined in claim 13, wherein at least one pseudo-random noise sequence of the plurality of pseudo-random noise sequences is configured to have a length at least twice the length of the time domain symbol sequence. 16. A processor as defined in claim 13, further comprising: a fast Fourier transform unit configured to convert the acquisition pilot symbol modulated by the modulator to frequency domain for use by the spectrum mask unit. 17. A processor as defined in claim 16, further comprising: an inverse fast Fourier transform unit configured to convert the acquisition pilot symbol to frequency domain after the acquisition pilot symbol has been processed by the spectrum mask unit. 18. A processor, comprising: a pseudo-random noise sequence generator configured to generate a pseudo-random noise sequence that corresponds to predefined system information to be communicated to a receiver;a modulator configured to construct an acquisition pilot symbol by modulating a time domain symbol sequence with the pseudo-random noise sequence;a spectrum mask unit configured to mask the acquisition pilot symbol to a prescribed frequency profile; andan assembly unit configured to place the modulated acquisition pilot symbol in a frame for wireless transmission;wherein the pseudo-random noise sequence generator is further configured to generate a C number of pseudo-random noise sequence segments, where each of the c number of pseudo-random noise sequence segments represents a different corresponding particular wireless system configuration of a C number of different wireless system configurations;wherein the pseudo-random noise sequence generator is further configured to generate the C number of sequences by: establishing a maximum length pseudo-random noise sequence having a number of bits as determined by the relationship 1+[log2∑c=0C-1N(c)] where N is the length of the time domain symbol sequence and c represents one of the C number of sequences, the maximum length pseudo-random noise sequence having with a length of at least 2∑c=0C-1N(c); anddividing the maximum length pseudo-random noise sequence into C non-overlapping pseudo-random noise segments each having a length 2N. 19. An apparatus for use in a wireless communication device comprising: means for generating a plurality of pseudo-random noise sequences having at least a predetermined length including a C number of pseudo-random noise subsequences, each pseudo-random noise sequence representing a different corresponding system information, each pseudo-random noise subsequence representing a corresponding configuration of a C number of different wireless system configurations;means for modulating a time domain symbol sequence with one of the plurality of pseudo-random noise sequences to create an acquisition pilot symbol;means for masking the acquisition pilot symbol to a prescribed frequency profile; andmeans for placing the modulated and masked acquisition pilot symbol in a frame for wireless transmission. 20. An apparatus as defined in claim 19, wherein the time domain symbol sequence is a QPSK time domain symbol sequence. 21. An apparatus as defined in claim 19, wherein the means for generating the plurality of pseudo-random noise sequences is further configured to generate at least one pseudo-random noise sequence of the plurality of pseudo-random noise sequences to have a length at least twice the length of the time domain symbol sequence. 22. An apparatus as defined in claim 19, further comprising: means for converting the modulated acquisition pilot symbol to frequency domain with a fast Fourier transform prior to masking. 23. An apparatus as defined in claim 22, further comprising: means for converting the acquisition pilot symbol to frequency domain using a inverse fast Fourier transform after the acquisition pilot symbol has been masked. 24. A processor for use in a wireless communication device, comprising: means for generating at least one pseudo-random noise sequence having at least a predetermined length, where the at least one pseudo-random noise sequence represents a system configuration of a wireless system;means for modulating a time domain symbol sequence with the at least one pseudo-random noise sequence to create an acquisition pilot symbol;means for masking the acquisition pilot symbol to a prescribed frequency profile; andmeans for placing the modulated and masked acquisition pilot symbol in a frame for wireless transmission;wherein the means for generating the at least one pseudo-random noise sequence is further configured to generate a C number of pseudo-random noise sequence segments, where each of the C number of pseudo-random noise sequence segments represents a different corresponding particular wireless system configuration of a C number of different wireless system configurations;wherein the means for generating the pseudo-random noise sequences is further configured to generate the C number of pseudo-random noise sequences by: establishing a maximum length pseudo-random noise sequence having a number of bits as determined by the relationship 1+[log2∑c=0C-1N(c)] where N is the length of the time domain symbol sequence and c represents one of the C number of sequences, the maximum length PN sequence having with a length of at least 2∑c=0C-1N(c); anddividing the maximum length PN sequence into C non-overlapping PN segments each having a length 2N. 25. A non-transitory computer-readable medium encoded with a set of instructions, the instructions comprising: an instruction for generating a plurality of pseudo-random noise sequences having at least a predetermined length including a C number of pseudo-random noise subsequences, each pseudo-random noise sequence representing a different corresponding system information, each pseudo-random noise subsequence representing a corresponding configuration of a C number of different wireless system configurations;an instruction for modulating a time domain symbol sequence with one of the plurality of pseudo-random noise sequences to create an acquisition pilot symbol;an instruction for masking the acquisition pilot symbol to a prescribed frequency profile; andan instruction for placing the modulated and masked acquisition pilot symbol in a frame for wireless transmission. 26. A non-transitory computer-readable medium as defined in claim 25, wherein the time domain symbol sequence is a QPSK time domain symbol sequence. 27. A non-transitory computer-readable medium as defined in claim 25, wherein at least one pseudo-random noise sequence of the plurality of pseudo-random noise sequences is configured to have a length at least twice the length of the time domain symbol sequence. 28. A non-transitory computer-readable medium as defined in claim 25, further comprising: an instruction for converting the modulated acquisition pilot symbol to frequency domain with a fast Fourier transform prior to masking. 29. A non-transitory computer readable medium as defined in claim 28, further comprising: an instruction for converting the acquisition pilot symbol to frequency domain using a inverse fast Fourier transform after the acquisition pilot symbol has been masked. 30. A non-transitory computer readable medium encoded with a set of instructions, the instructions comprising: an instruction for generating at least one pseudo-random noise sequence having at least a predetermined length, where the at least one pseudo-random noise sequence represents a system configuration of a wireless system;an instruction for modulating a time domain symbol sequence with the at least one pseudo-random noise sequence to create an acquisition pilot symbol;an instruction for masking the acquisition pilot symbol to a prescribed frequency profile; andan instruction for placing the modulated and masked acquisition pilot symbol in a frame for wireless transmission;wherein the instruction for generating the at least one pseudo-random noise sequence includes an instruction for generating a C number of pseudo-random noise sequence segments, where each of the C number of pseudo-random noise sequence segments represents a different corresponding particular wireless system configuration of a C number of different wireless system configurations;wherein generating the C number of pseudo-random noise sequences further includes: an instruction for establishing a maximum length pseudo-random noise sequence having a number of bits as determined by the relationship 1+[log2∑c=0C-1N(c)] where N is the length of the time domain symbol sequence and c represents one of the C number of sequences, the maximum length PN sequence having with a length of at least 2∑c=0C-1N(c);andan instruction for dividing the maximum length PN sequence into C non-overlapping PN segments each having a length 2N.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (41)
Kim,Min Goo; Jang,Jae Sung, Apparatus and method for generating codes in communication system.
Kim Young-Sang,KRX ; Langinieux Francois,FRX, Frame synchronization method and apparatus for use in digital communication system utilizing OFDM method.
Lee Chong U. ; Moallemi Kamran ; Warren Robert L., Method and apparatus for embedding auxiliary data in a primary data signal using frequency and time domain processing.
Lee, Jeong-Goo; Ham, Seok-Jin, Method for recovering dropped call in mobile station for CDMA system and method for informing recovery of the dropped call.
Okumura, Yukihiko; Ando, Hidehiro, Multiplexing method and multiplexing device, and data signal transmission method and data signal transmission device.
Maltsev,Alexander A.; Pudeyev,Andrey V.; Soupikov,Alexei M.; Triaspolsky,Sergey A., Receiver and method to detect and synchronize with a symbol boundary of an OFDM symbol.
White Gregory Charles ; Emeott Stephen Paul, System for error control by subdividing coded information units into subsets reordering and interlacing the subsets, to produce a set of interleaved coded information units.
Mantravadi, Ashok; Chari, Murali Ramaswamy; Wang, Michael Mao; Ling, Fuyun; Vijayan, Rajiv; Krishnamoorthi, Raghuraman, System and method for frequency diversity.
Wang, Michael Mao; Chari, Murali Ramaswamy; Mantravadi, Ashok; Ling, Fuyun; Vijayan, Rajiv; Krishnamoorthi, Raghuraman, System and method for frequency diversity.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.