Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Reexamination Certificate
2003-12-27
2008-09-09
Backer, Firmin (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
C708S442000
Reexamination Certificate
active
07423960
ABSTRACT:
A novel and simplified orthogonal frequency division multiplexing (OFDM) equalizer uses a coordinate rotation digital computer (CORDIC) to convert the estimated channel effects from rectangular coordinate to polar coordinate and to compensate the phase error with the same CORDIC circuit of synchronization. The OFDM equalizer comprises: a fast Fourier transformer (FFT); a channel estimation circuit; a coordinate translator, comprising a CORDIC circuit, to translate the channel estimation value into a polar coordinate value; a pilot extractor to extract pilot signals and to track minor phase offsets of the received signal to synchronize phase of said received signal; a phase rotator to compensate phase of the received signal according to the channel estimation value and the phase tracking estimation value, to generate the real value and imaginary value of the phase compensated signal; and an amplitude adjustment circuit. The coordinate translator and the phase rotator use the same CORDIC circuit.
REFERENCES:
patent: 6772181 (2004-08-01), Fu et al.
patent: 6874006 (2005-03-01), Fu et al.
patent: 6922549 (2005-07-01), Lyons et al.
patent: 7203718 (2007-04-01), Fu et al.
Chuang Yuan-Shin
Peng Chia-Sheng
Wen Kuei-Ann
Backer Firmin
Ho Raymond J.
Oveissi David
Venable LLP
Wen Kuei-Ann
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