Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Reexamination Certificate
2008-01-29
2008-01-29
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
C375S343000, C375S344000
Reexamination Certificate
active
07324609
ABSTRACT:
An OFDM receiver has a DC offset estimator configured for determining a DC offset, in I and Q components of a received OFDM signal having been output by an analog front end, based on filtering prescribed subcarrier components from a preamble segment of the I and Q components. The OFDM receiver removes the determined DC offset from the I and Q components, resulting in respective corrected I and Q components having minimal DC offset.
REFERENCES:
patent: 6757344 (2004-06-01), Carleton
patent: 6816555 (2004-11-01), Sakoda
patent: 6961393 (2005-11-01), Cupo et al.
patent: 7010559 (2006-03-01), Rawlins et al.
patent: 7103090 (2006-09-01), Chang et al.
patent: 7151759 (2006-12-01), Ryan et al.
patent: 2002/0065047 (2002-05-01), Moose
patent: 2002/0097812 (2002-07-01), Wiss
patent: 2003/0128776 (2003-07-01), Rawlins et al.
patent: 2004/0002308 (2004-01-01), Eberle
patent: 2004/0203472 (2004-10-01), Chien
patent: 2004/0219884 (2004-11-01), Mo et al.
patent: 2004/0228424 (2004-11-01), Baldwin et al.
patent: 2005/0025041 (2005-02-01), Marsili
patent: 2005/0058227 (2005-03-01), Birkett et al.
patent: 2005/0111525 (2005-05-01), Driesen et al.
Heiskala “OFDM wireless LANs: A theoretical and practical guide”, SAMS 2002 pp. 66-73.
Moose, “A technique for orthogonal frequency division multiplexing frequency offset correction”, IEEE Transactions on Communications, vol. 42, Issue 10, Oct. 1994 pp. 2908-2914.
Miaoudakis, “Carrier frequency offset estimation and correction for Hiperlan/2 WLANs”, Proceedings, ISCC 2002, Seventh International Symposium on Computers and Communications, 2002. Jul. 1-4, 2002 pp. 693-698.
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 Physical Layer in the 5 GHZ Band”, LAN/MAN Standards Committee of the IEEE Computer Society, IEEE-SA Standards Board, Approved Sep. 16, 1999, New York, USA.
Hwang Chien-Meen
Kutagulla Harish
Zhou Xu
Advanced Micro Devices , Inc.
Ghayour Mohammed
Manelli Denison & Selter PLLC
Torres Juan Alberto
Turkevich Leon R.
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