Channel tracking using step size based on norm-1 based...

Details Channel tracking using step size based on norm-1 based... Channel tracking using step size based on norm-1 based...

2008-04-22

2008-04-22

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S149000, C375S130000, C375S346000, C375S354000, C375S355000

Reexamination Certificate

active

10839265

ABSTRACT:
A channel tracking module, configured for generating updated equalization coefficients for a frequency equalizer, is configured for determining a digital-based error value between equalized signals output by the frequency equalizer relative to predicted signals, for each subcarrier frequency of an OFDM symbol. The channel tracking module determines an accumulated error based on accumulating the digital-based error values for all the subcarrier frequencies of the OFDM symbol, for a prescribed successive number of OFDM symbols. The channel tracking module also determines a step size based on the accumulated error and relative to a prescribed step function configured for optimizing equalizer adjustments within stability limits. The channel tracking updates the equalization coefficients for each subscarrier frequency based on the accumulated error and the step size. Hence, the channel tracking module can be implemented in an economical manner while ensuring optimum equalizer adjustments within stability limits that ensure convergence of the equalization coefficients.

REFERENCES:
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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.

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