Apparatus and method for channel quality estimation and link...

Telecommunications – Radiotelephone system – Zoned or cellular telephone system

Reexamination Certificate

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C455S067110, C455S464000, C370S208000, C370S210000

Reexamination Certificate

active

07116981

ABSTRACT:
A method for channel quality estimation and link adaptation for an OFDM wireless communication system includes: (a) estimating a channel gain and a noise power, and measuring an SNR in consideration of the estimated channel gain and noise power; (b) calculating a correlation value between an externally received preamble signal and a known preamble signal, and estimating a delay spread; (c) measuring the quality status of a channel in consideration of the measured SNR and the estimated delay spread; and (d) determining parameters including transmit power, data modulation mode, and data rate, according to the measured quality status of the channel, and performing a link adaptation using a protocol for acknowledging a normal signal transmission as well as using the SNR and the delay spread.

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patent: 1020020041196 (2002-06-01), None
Paul Lettieri et al., Adaptive Frame Length Control for Improving Wireless Link Throughput, Range, and Energy Efficiency, 0-7803-4383-2/98; 1998 IEEE (pp. 564-571).
Daji Qiao et al., Goodput Enhancement of IEEE 802.11a Wireless LAN via Link Adaptation, 0-7803-7097-1/01, 2001 IEEE (pp. 1995-2000).

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