Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Reexamination Certificate
2006-07-04
2006-07-04
Nguyen, Chau (Department: 2661)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
C370S281000, C370S344000, C375S260000
Reexamination Certificate
active
07072289
ABSTRACT:
A method of estimating timing of at least one of the beginning and the end of a transmitted signal segment in the presence of time delay in a signal transmission channel. Each of a sequence of signal frames is provided with a pseudo-noise (PN) m-sequences, where the PN sequences satisfy selected orthogonality and closures relations. A convolution signal is formed between a received signal and the sequence of PN segments and is subtracted from the received signal to identify the beginning and/or end of a PN segment within the received signal. PN sequences are used for timing recovery, for carrier frequency recovery, for estimation of transmission channel characteristics, for synchronization of received signal frames, and as a replacement for guard intervals in an OFDM context.
REFERENCES:
patent: 6449245 (2002-09-01), Ikeda et al.
patent: 6487252 (2002-11-01), Kleider et al.
patent: 6567374 (2003-05-01), Bohnke et al.
patent: 2002/0034264 (2002-03-01), Vigil
patent: 2002/0122381 (2002-09-01), Wu et al.
Gong Ke
Yang Lin
Yang Zhi-Xing
Moore Ian N.
Nguyen Chau
Patent Law Group LLP
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