Patent ID: 7116981
Filing Date: 2006-10-03
Classification: H04L

Abstract:
1. A method for channel quality estimation and link adaptation, which is for an orthogonal frequency division multiplexing (OFDM) wireless communication system, the method comprising: (a) estimating a channel gain and a noise power, and measuring a signal-to-noise ratio in consideration of the estimated channel gain and the estimated noise power; (b-1) calculating a correlation value between an externally received preamble signal and a known preamble signal, and estimating a delay spread; (b-2) calculating a maximum of the calculated correlation value and determining a normalized accumulated power estimate using the calculated maximum; (c) measuring the quality status of a channel in consideration of the measured signal-to-noise ratio 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.