Multiplex communications – Generalized orthogonal or special mathematical techniques
Reexamination Certificate
2007-10-09
2007-10-09
Marcelo, Melvin (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
37
Reexamination Certificate
active
10259767
ABSTRACT:
An orthogonal frequency division multiplexing (OFDM) communications system transmits data on a plurality of subcarriers and has a featureless synchronization signal. The OFDM communications system transmits synchronization tones on pseudorandomly selected subcarriers. A receiver generates the same synchronization tones and performs a correlation on the received signal with the receiver synchronization tones. The correlation is performed at the beginning and the end of the synchronization symbol. A product of the two correlations results in a magnitude peak and a phase difference. The magnitude peak is used to determine the location in time of the sync symbol and the phase difference is used to determine the frequency offset of the received signal.
REFERENCES:
patent: 6373861 (2002-04-01), Lee
patent: 2006/0098752 (2006-05-01), Song et al.
“Time and Frequency Synchronization for OFDM using PN-Sequence Preambles”, by Fredrik Tufvesson et al. Proc. of IEEE Vehicular Technology Conference, Amsterdam, The Netherlands, Sep. 1999.
“Synchronization Requirements for Multi-user OFDM on Satellite Mobile and Two-path Rayleigh Fading Channels”, by Lei Wei et al. IEEE Transactions on Communications, vol. 43, No. 2/3/4, Feb./Mar./Apr. 1995.
Newhouse Michael N.
Zange Daniel M.
Eppele Kyle
Jensen Nathan O.
Marcelo Melvin
Rockwell Collins, Inc.
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