SYSTEMS AND METHODS FOR ENHANCED CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEMS

摘要

Disclosed herein are methods and apparatus for enhancing the estimation o f channel response in a wireless communication system. An apparatus (and ass ociated method) for optimizing channel estimation in a communication system includes a receiving antenna; a receiver adapted to receive a signal from th e receiving antenna; an initial channel estimator module adapted to select a selected channel from among one or more channels in the communication syste m and to determine, for the selected channel, an initial channel estimate ba sed upon the received signal; a transformation module adapted to transform t he initial channel estimate into an initial impulse response estimate compri sing a sequence of samples; a filtering module adapted to select a sub-seque nce of samples from the sequence of samples and generate a truncated initial impulse response estimate by setting to zero the samples in the initial imp ulse response estimate that are not in the selected sub-sequence of samples; and a maximum likelihood channel estimating module adapted to compute a tim e domain weighted impulse response estimate using the truncated time domain impulse response estimate for the selected channel and to compute a maximum likelihood channel estimate for the selected channel by transforming the tim e domain weighted impulse response estimate into the frequency domain.