Patent ID: 6314147
Filing Date: 2001-11-06
Classification: H04B,H04L

Abstract:
In a digital receiver comprising a linear filter and a Viterbi equalizer, a method for providing estimated symbols corresponding to desired symbols from a received signal comprising the desired symbols, co-channel interference (CCI), and inter-symbol interference (ISI), the method comprising the steps of:a) coupling the received signal through a plurality of spatially-separated antennas to corresponding inputs of the linear filter;b) passing the received signal through the linear filter to provide an intermediate signal with substantially reduced CCI content and substantially equivalent ISI content compared to that of the received signal; andc) passing the intermediate signal through the Viterbi equalizer to substantially remove the ISI and provide the estimated symbols;wherein the step of passing the received signal through the linear filter further comprises the steps of:i) determining a first channel estimate from the received signal;ii) convolving known training symbols with the first channel estimate to obtain a reference signal;iii) applying minimum mean-square error (MMSE) criteria to the difference between the intermediate signal and the reference signal to compute coefficients for the linear filter; andiv) filtering the received signal in accordance with the coefficients to produce the intermediate signal.