On MMSE real-time antenna array processing using fourth-order statistics in the US cellular TDMA system

The antenna array processing problem in the reverse link of the current US digital cellular communication system is studied and higher than second-order statistics (HOS) baseband processing is proposed as a possible candidate solution. The approach, based on the minimization of the mean squared error using fourth-order cumulants alone, is non-blind because the knowledge of the synchronization sequences of the IS-136 system is fully exploited. A recursive total least squares algorithm is used in the adaptive implementation to mitigate the effects of high error variance in the estimates of the cumulants based on sample-statistics. The method is very effective in a fast fading environment and strong cochannel interference