Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Reexamination Certificate
2007-12-25
2007-12-25
To, Doris H. (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
C370S210000, C370S281000, C375S260000
Reexamination Certificate
active
10191801
ABSTRACT:
A method for synchronizing symbol timing and frequency of symmetric-identical (SI) Orthogonal Frequency Division Multiplexed signals (OFDM) wherein an SI preamble is used for calculation of the symbol timing and frequency synchronism offset of the OFDM signals out of the samples of the received signals is provided. The SI preamble includes a first sample group and a second sample group, being alternately arrayed several times, in which the first sample group includes a designated number of samples that are arrayed in order of arrival, while the second sample group includes the same number of samples with the first sample group, but in inverse order of arrival. Because distinctive correlation coefficients of the identical samples are very distinctive from each other, it is possible to estimate a starting point of the OFDM symbol more precisely. Using the SI preamble, both symbol synchronism and a fine frequency offset and a coarse frequency offset can be estimated. Moreover, the transmission efficiency and the overall capacity of the OFDM system are greatly improved.
REFERENCES:
patent: 5732113 (1998-03-01), Schmidl et al.
patent: 6658063 (2003-12-01), Mizoguchi et al.
patent: 6731594 (2004-05-01), Bohnke
patent: 6738443 (2004-05-01), Bohnke et al.
patent: 2001-0105898 (2001-11-01), None
The 2001 International Technical Conference on Circuits/Systems, Computers and Communicates vol. 1 Published Jul. 10, 2001.
A Fast Synchronization for OFDM Applications using a Symmetric-Identical Preamble published Jul. 10, 2001.
Moore Ian N.
Samsung Electronics Co,. Ltd.
Sughrue Mion Pllc.
To Doris H.
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