Pulse or digital communications – Equalizers
Reexamination Certificate
2007-07-31
2007-07-31
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Equalizers
C375S346000
Reexamination Certificate
active
10367865
ABSTRACT:
A channel estimator, configured for supplying equalization coefficients to a frequency equalizer, is configured for determining equalizer coefficients for a received wireless signal based on a minimum equalization error-based estimation. The channel estimator is configured for identifying first and second long preambles from the received wireless signal, determining an equalization coefficient for a selected frequency based on a minimized cost function for the first and second long preambles relative to a prescribed preamble value for the selected frequency, and supplying the equalization coefficient for the selected frequency to a frequency equalizer for equalization of the received wireless signal.
REFERENCES:
Rouzet, “D4: Exploration of the HIPERLAN/2 standard and comparison with other wireless LAN standards”, EASY,Jan. 31, 2002.
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”, L.AN/MAN Standards Committee of the IEEE Computer Society, IEEE-SA Standards Board, Approved Sep. 16, 1999, New York, USA.
Larsson et al., “An Algorithm For Joint Symbol Timing and Channel Estimation for OFDM Systems”, IEEE, Aug. 6, 2001, pp. 393-396.
Hsu et al., “Design of an OFDM Receiver for High-speed Wireless LCN”, ISCAS 2001, Proceedings of the 1002 IEEE International Symposium on Circuits and Systems, New York, NY, IEEE vol. 1 of 5, May 6, 2001, pp. IV-558-IV-561.
Armour et al., “A Pre-FFT Equalizer Design for Application to Hiperlan/2”, IEEE, vol. 4, Sep. 24, 2000, pp. 1690-1697.
Onozawa et al., “A Simple Adaptive Channel Estimation Scheme for OFDM Systems”, Vehicular Technology Conference, 1999, VTC 1999-Fall, IEEE VTS 50thAmsterdam, Netherlands, Sep. 19-22, 1999, Piscataway, NJ, USA, IEEE, US, Sep. 19, 1999, pp. 279-283.
Hou Ping
Hwang Chien-Meen
Shen Jia-Pei
Advanced Micro Devices , Inc.
Ghebretinsae Temesghen
Manelli Denison & Selter PLLC
Torres Juan Alberto
Turkevich Leon R.
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