Coarse frequency estimation in an OFDM receiver based on...

Details Coarse frequency estimation in an OFDM receiver based on... Coarse frequency estimation in an OFDM receiver based on...

2007-09-25

2007-09-25

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S344000

Reexamination Certificate

active

10768073

ABSTRACT:
An OFDM receiver has an autocorrelation circuit configured for generating an autocorrelation result from samples of received short preamble symbols in a received data packet, where the autocorrelation circuit generates each autocorrelation result based on accumulation of the samples having been received for the short preamble symbols. Hence, by using all received samples of the short preamble symbols, the autocorrelation based on accumulated samples minimizes the effect of noise and provides a more accurate coarse frequency estimation result.

REFERENCES:
patent: 2002/0065047 (2002-05-01), Moose
patent: 2004/0005018 (2004-01-01), Zhu et al.
patent: 2005/0025264 (2005-02-01), Chen
Moose “A technique for orthogonal frequency division multiplexing frequency offset correction”, IEEE Transactions on Communications, vol. 42, Issue 10, Oct. 1994 pp. 2908-2914.
Jian Li, “Carrier frequency offset estimation for OFDM-based WLANs”, IEEE Signal Processing Letters, vol. 8, Issue 3, Mar. 2001 pp. 80-82.
IEEE Std. 802.11a-1999, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-speed Physial Layer in the 5 GHZ Band”, L.AN/MAN Standards Committee of the IEEE Computer Society, IEEE-SA Standards Board, Approved Sep. 16, 1999, New York, USA.

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