Patent ID: 7215646
Filing Date: 2007-05-08
Classification: H04L

Abstract:
1. In a wireless communication system including at least one wireless transmit/receive unit (WTRU), and at least one Node-B, the Node-B communicating with the WTRU via a wireless communication channel, a method of estimating the quality of the wireless communication channel comprising: (a) the WTRU receiving a modulated signal from the Node-B via the wireless communication channel; (b) a channel estimator in the WTRU performing a channel estimation on the modulated signal to obtain a channel estimate; (c) a pre-demodulation signal-to-interference (SIR) estimator in the WTRU performing a SIR estimation on a channel estimate output by the channel estimator to obtain a pre-demodulation SIR estimate; (d) a demodulator in the WTRU demodulating the modulated signal based on a channel estimate output by the channel estimator to obtain a demodulated signal; (e) a post-demodulation SIR estimator in the WTRU performing a SIR estimation on a demodulated signal output by the demodulator to obtain a post-demodulation SIR estimate; (f) a channel quality estimator in the WTRU receiving the pre-demodulation SIR estimate from the pre-demodulation SIR estimator; (g) the channel quality estimator receiving the post-demodulation SIR estimate from the post-demodulation SIR estimator; and (h) the channel quality estimator estimating the quality of the wireless communication channel based on the pre-demodulation SIR estimate, the post-demodulation SIR estimate and additional information including at least one of delay spread, transmit power and WTRU velocity information.