Orthogonal frequency division multiplexing (OFDM) equalizer

Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions

Reexamination Certificate

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C708S442000

Reexamination Certificate

active

10745754

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.

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