Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
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:
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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.
Hwang Chien-Meen
Li Yong
Zhou Xu
Advanced Micro Devices , Inc.
Ghebretinsae Temesghen
Manelli Denison & Selter PLLC
Torres Juan Alberto
Turkevich Leon R.
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