[특허]System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design

[미국특허] System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04J-011/00
출원번호	US-0204238 (2011-08-05)
등록번호	US-8441918 (2013-05-14)
발명자 / 주소	Ma, Jianglei Jia, Ming Zhu, Peiying Tong, Wen
출원인 / 주소	Apple Inc.
대리인 / 주소	Paradigm IP Law, PC
인용정보	피인용 횟수 : 18 인용 특허 : 22

초록 ▼

A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.

대표청구항 ▼

1. A method comprising: converting a frequency domain representation of a common sync sequence into a time domain representation;transmitting the time domain representation twice, preceded by a cyclic prefix of the time domain representation;wherein the common sync sequence is a complex sequence which is different for each transmit antenna of one transmitter, but which is common for respective transmit antennas of each transmitter within a communications network. 2. The method of claim 1 wherein converting a frequency domain representation of a common sync sequence into a time domain representation comprises mapping the common sync sequence to a set of non-adjacent orthogonal frequency division multiplexing (OFDM) sub-carriers and performing an inverse fast Fourier transform (IFFT). 3. The method of claim 1 wherein the common sync sequence is common to multiple base stations. 4. The method of claim 1 wherein the common sync sequence is transmitted on a common synchronization channel. 5. The method of claim 1 further comprising: multiplexing the frequency domain representation of the common sync sequence with a frequency domain representation of a dedicated pilot channel sequence; andconverting the frequency domain representation of the multiplexed sequences into the time domain representation. 6. The method of claim 1 further comprising: multiplexing the frequency domain representation of the common sync sequence with a frequency domain representation of broadcast channel information; andconverting the frequency domain representation of the multiplexed sequence and information into the time domain representation. 7. The method of claim 1 further comprising: multiplexing the frequency domain representation of the common sync sequence with a frequency domain representation of a dedicated pilot channel sequence and a frequency domain representation of broadcast channel information; andconverting the frequency domain representation of the multiplexed sequences and information into the time domain representation. 8. A network device comprising: at least two antennas;processing circuitry configured to: convert a frequency domain representation of a common sync sequence into a time domain representation;transmit the time domain representation twice, preceded by a cyclic prefix of the time domain representation;wherein the common sync sequence is a complex sequence which is different for each transmit antenna of one transmitter, but which is common for respective transmit antennas of each transmitter within a communications network. 9. The network device of claim 8 wherein the processing circuitry configured to convert the frequency domain representation of the common sync sequence into the time domain representation is configured to map the common sync sequence to a set of non-adjacent orthogonal frequency division multiplexing (OFDM) sub-carriers and perform an inverse fast Fourier transform (IFFT). 10. The network device of claim 8 wherein the common sync sequence is common to multiple base stations. 11. The network device of claim 8 wherein the common sync sequence is transmitted on a common synchronization channel. 12. The network device of claim 8, wherein the processing circuitry is further configured to: multiplex the frequency domain representation of the common sync sequence with a frequency domain representation of a dedicated pilot channel sequence; andconvert the frequency domain representation of the multiplexed sequences into the time domain representation. 13. The network device of claim 8, wherein the processing circuitry is further configured to: multiplex the frequency domain representation of the common sync sequence with a frequency domain representation of broadcast channel information; andconvert the frequency domain representation of the multiplexed sequence and information into the time domain representation. 14. The network device of claim 8, wherein the processing circuitry is further configured to: multiplex the frequency domain representation of the common sync sequence with a frequency domain representation of a dedicated pilot channel sequence and a frequency domain representation of broadcast channel information; andconvert the frequency domain representation of the multiplexed sequences and information into the time domain representation.

이 특허에 인용된 특허 (22) 인용/피인용 타임라인 분석

Sato Toru (Tokyo JPX) Saito Masafumi (Tokyo JPX), AFC in OFDM modulation by shift of a window along a reception sample sequence.
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Kim Young-Sang,KRX ; Langinieux Francois,FRX, Frame synchronization method and apparatus for use in digital communication system utilizing OFDM method.
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Mark Wallace ; Jay R. Walton ; Ahmad Jalali, Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system.
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Baum, Kevin L.; Nadgauda, Nikhil S., Method and apparatus for synchronizing an OFDM signal.
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Laroia,Rajiv; Li,Junyi; Rangan,Sundeep; Sampath,Hemanth T., Method and apparatus for time and frequency synchronization of OFDM communication systems.
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Li, Xiaodong; Liu, Hui; Yin, Hujun; Xing, Guanbin; Mu, Fuqi, Multi-carrier communications with group-based subcarrier allocation.
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Steven Richard Ring GB, Multidirectional communication systems.
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Mizoguchi, Masato; Onizawa, Takeshi; Kumagai, Tomoaki; Morikura, Masahiro, OFDM packet communication receiver system.
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Saito Masafumi,JPX ; Ikeda Tetsuomi,JPX, Orthogonal frequency division multiplexing transmission system and transmitter and receiver adapted to the same.
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Wang,Yi Hsu; Gilbert,Jeffrey M., Post-FFT scaling to reduce multiple effects.
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Mody,Apurva N.; Stuber,Gordon L., Preamble structures for single-input, single-output (SISO) and multi-input, multi-output (MIMO) communication systems.
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Higuchi Kenichi,JPX ; Sawahashi Mamoru,JPX ; Adachi Fumiyuki,JPX ; Ohno Koji,JPX ; Higashi Akihiro,JPX, Signal transmitting method, transmitter, receiver, and spread-spectrum code synchronizing method for mobile communication system.
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Brink Stephan ten,DEX ; van Nee Richard D. J.,NLX, Soft handover system for a multiple sub-carrier communication system and method thereof.
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Maekawa, Takuji; Usui, Takashi, Sync signal detection method and radio communication system.
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Ma,Jianglei; Tong,Wen; Wu,Shiquan, Synchronization in a multiple-input/multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system for wireless applications.
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Baum Kevin Lynn ; Nadgauda Nikhil Shashank, Synchronous coherent orthogonal frequency division multiplexing system, method, software and device.
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Ma, Jianglei; Jia, Ming; Zhu, Peiying; Tong, Wen, System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design.
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Yang,Lin; Yang,Zhi Xing, Terrestrial digital multimedia/television broadcasting system.
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Mody,Apurva N.; Stuber,Gordon L., Time and frequency synchronization in multi-input, multi-output (MIMO) systems.
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이 특허를 인용한 특허 (18) 인용/피인용 타임라인 분석

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Lastinger, Roc; Spenik, John; Woodbury, Brian C, MIMO methods and systems.
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Hung, Shao-Ping; Ho, Tien-Hsin; Tung, Tai-Lai; Chuang, Ching-Hsiang, Method and associated apparatus applied to receiver of wireless network for determining quantity of antennas of transmitter.
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Lastinger, Roc; Spenik, John; Woodbury, Brian C., Methods and apparatus for overlapping MIMO physical sectors.
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Lastinger, Roc; Spenik, John; Woodbury, Brian C., Methods and apparatus for overlapping MIMO physical sectors.
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Lastinger, Roc; Spenik, John; Woodbury, Brian C., Methods and apparatus for overlapping MIMO physical sectors.
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Lastinger, Roc; Spenik, John; Woodbury, Brian C., Methods and apparatus for overlapping MIMO physical sectors.
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Lastinger, Roc; Spenik, John; Woodbury, Brian C., Methods and apparatus for overlapping MIMO physical sectors.
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Lastinger, Roc; Spenik, John; Woodbury, Brian C., Methods and apparatus for overlapping MIMO physical sectors.
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Imamura, Daichi; Iwai, Takashi; Inogai, Kazunori; Futagi, Sadaki; Matsumoto, Atsushi, Sequence allocating method and sequence allocating apparatus.
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Ma, Jianglei; Jia, Ming; Zhu, Peiying; Tong, Wen, System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design.
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Ma, Jianglei; Jia, Ming; Zhu, Peiying; Tong, Wen, System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design.
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Ma, Jianglei; Jia, Ming; Zhu, Peiying; Tong, Wen, System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design.
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Oroskar, Siddharth S.; Vargantwar, Sachin R., Systems and methods for allocating fully-orthogonal and quasi-orthogonal spreading codes to access terminals in radio access networks based on a tolerance level for additional interference on a per-access-terminal basis.
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[미국특허] System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design 원문보기

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[미국특허] System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design 원문보기

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이 특허에 인용된 특허 (22) 인용/피인용 타임라인 분석

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