Orthogonal frequency division multiplexing receiver where...

Details Orthogonal frequency division multiplexing receiver where... Orthogonal frequency division multiplexing receiver where...

2005-02-08

2005-02-08

Pham, Chi (Department: 2667)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C375S147000, C375S260000, C375S136000

Reexamination Certificate

active

06853616

ABSTRACT:
An OFDM receiver for interlocking FFT window position recovery with sampling clock control, and a method thereof are provided. This method includes the steps of: extracting a pilot signal from fast-Fourier-transformed OFDM received signals, and detecting inter-pilot phase differences; averaging the detected phase differences for a symbol and normalizing the mean phase difference by dividing it into reference values corresponding to phase differences generated when FFT window errors of at least one sample exist; and simultaneously controlling the FFT window position offset using a value obtained by rounding off the normalized value, and the sampling clock offset using the difference between the round-off value and the normalized value.

REFERENCES:
patent: 5867478 (1999-02-01), Baum et al.
patent: 6122246 (2000-09-01), Marchok et al.
L. Litwin and M. Pugel. “The principles of OFDM”, http://rfdesign.com/, Jan. 1, 2001, pp. 30-48.*
H. Zou, B. McNair, and B. Daneshard, “An Intergrated OFDM Receiver for High-Speed Mobile Data Communications”, http://www.novidesic.com/pubs/globecom01_final3.pdf; Oct. 2001.

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