Source: http://www.google.com/patents/US8018975?dq=6,205,432
Timestamp: 2017-09-24 09:08:22
Document Index: 761501919

Matched Legal Cases: ['Application No. 10200', 'Application No. 10158841', 'Application No. 10161508', 'Application No. 10161516', 'Application No. 10183133', 'Application No. 10183138', 'Application No. 10183138', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10']

Patent US8018975 - Method and system for performing synchronization in OFDM systems - Google Patents
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...http://www.google.com/patents/US8018975?utm_source=gb-gplus-sharePatent US8018975 - Method and system for performing synchronization in OFDM systems
Publication number US8018975 B2
Application number US 11/529,245
Also published as CN1736052A, CN1736052B, CN101917264A, CN101917264B, CN101917265A, CN101917265B, CN101917377A, CN101917377B, DE60239213D1, EP1438799A2, EP1438799B1, EP2202907A1, EP2207297A1, EP2211516A1, EP2267959A2, EP2267959A3, EP2267960A2, EP2267960A3, EP2267961A2, EP2267961A3, EP2267962A2, EP2267962A3, US7548506, US7912012, US8085814, US8213292, US8441918, US8830816, US9172571, US9503161, US20030072255, US20070025236, US20070064586, US20070066362, US20090060076, US20120027136, US20120243626, US20120250787, US20130301400, US20140036823, US20160013925, US20170135006, WO2003034642A2, WO2003034642A3, WO2003034642B1
Publication number 11529245, 529245, US 8018975 B2, US 8018975B2, US-B2-8018975, US8018975 B2, US8018975B2
Inventors Jianglei Ma, Ming Jia, Peiying Zhu, Wen Tong
Patent Citations (48), Non-Patent Citations (38), Referenced by (20), Classifications (40), Legal Events (5)
Method and system for performing synchronization in OFDM systems
US 8018975 B2
24. A method according to claim 23 wherein another training sequence is received during an OFDM frame preamble.
In some embodiments, a coarse synchronization position is determined for each receive antenna and used for determining the respective fine synchronization position.
Referring again to FIG. 2B, it is noted that for non-header OFDM symbols, i.e. for the regular OFDM symbols 510, every OFDM symbol preferably also has a prefix. In “1K” mode, there are 32 prefix samples, and 1024 actual samples representing the FFT size, for a total of 1056 samples per symbol. In 1/2K mode, there is a 16 sample prefix, and then 512 samples per symbol (representing the FFT size) for a total of 528 samples/symbol. Advantageously, using the frame structure of FIG. 2B these different modes can be supported without changing the sampling frequency. When in 1/2K mode, there are twice as many OFDM symbols 510 per slot 506. The particular mode chosen at a given instant should be such that the prefix size is greater than the maximum channel delay in 1/K mode, more OFDM symbols are sent with fewer sub-carriers. This is more robust to high Doppler, because the symbol duration is shorter. Also, the spacing between the sub-carriers is larger further enhancing tolerance to Doppler. Thus, there is a unified frame structure which accommodates different FFT sizes, but with the same sampling rate a the receiver. Preferably the same preamble is used even for the different modes.
γ t ( n ) = ∑ i = 0 Nheader - 1 x ( n + i ) · x * ( n + i + N header )
γ f ( j , k ) ( i ) = ∑ m = 0 N SYNC - 1 R SYNC ( j , k ) ( m , i ) · PN SYNC * ( j ) ( m ) , i = 0 , … , 2 N
R(l,i)=R(l,i−1)·e i2π(k-1)/NFFT +x(n start(i)+N prefix)−x(n start(i−1)+N symbol−1)
n fine = arg max ( ∏ j = 1 N Tx ∏ l = 1 N Rx  γ f ( j , k ) ( i )  )
n fine ( k ) = arg max ( ∏ j = 1 N Tx  γ ( j , k ) ( i )  )
max ( ∏ j = 1 N Tx  γ ( j , j ) ( i )  ) > N threshold · 1 2 N + 1 · ∑ i = 0 2 N ∏ j = 1 N Tx  γ ( j , j ) ( i ) 
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U.S. Classification 370/509, 370/208, 370/503
International Classification H04B7/04, H04J3/06, H04B7/02, H04B7/06, H04J99/00, H04L5/02, H04J11/00, H04L27/26
Cooperative Classification H04W36/08, H04B7/022, H04L7/0008, H04L27/2602, H04B7/0697, H04B7/0413, H04L27/2613, H04L27/2628, H04L27/2663, H04L27/2607, H04L27/2675, H04L27/2665, H04L5/0023, H04L5/0037, H04B7/04, H04L5/0048, H04B7/0667, H04L27/2672, H04L27/2627
European Classification H04L5/00A3C, H04L27/26M3A1, H04L27/26M1, H04L5/00C5, H04L27/26M1G1, H04L27/26M1R3, H04L27/26M5C5A, H04L27/26M5C5B, H04L27/26M5C9A2, H04L27/26M5C9B1
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