Estimation of channel impulse response in a communication receiver

摘要

Embodiments herein provide using extreme value theory (EVT) as a diagnostic to decide which taps are significant. In the low SINR scenario, embodiments herein also provide the following options; i) Fix the model order to a finite value smaller than the model order assumed for the initial CIR estimate. In the case of OFDM based systems, the model order of the CIR is fixed to a value much smaller that the cyclic prefix length. ii) Use the EVT based method to detect significant tap locations and only keep those tap locations such that the CIR length is again restricted to a value smaller than the model order of the initial channel estimate.

主权项

1. A method for estimating the Channel Impulse Response (CIR) for a received signal in a receiver in a communication system, said method comprising:
computing a coarse channel estimate at pilot locations in said received signal; computing a channel power estimate using the computed coarse channel estimate; estimating a sum of interference power and a thermal noise variance; computing an optimal regularization term using said sum of interference power, said thermal noise variance, and said channel power estimate; computing an optimally regularized Modified Least Square (MLS) estimate using said optimal regularization term; computing a variance of noise in said regularized MLS estimate; identifying probable multipath tap locations in said received signal using said MLS estimate and said variance of noise in said regularized MLS estimate; classifying said probable multipath locations into significant multipath locations and locations with noise; and estimating the CIR using said significant multipath locations.