Patent ID: 8094699
Filing Date: 2012-01-10
Classification: H04B

Abstract:
1. A method for demodulating a multiuser signal using channel decoders for a multiple-access communication system, the method comprising: receiving a signal containing information for a plurality of users in a multiple-access communication system employing spreading sequences; despreading the received signal using a signature sequence for each user to produce individual user signals having multiple-access interference (MAI); determining channel estimates associated with each of the individual user signals; and decoding each of the individual user signals using a channel decoder that computes a log-likelihood ratio (LLR) based on an equation for the time-varying variance of the MAI in the individual user signals in which the channel estimates of the received signals of other users are represented by fading coefficients due to the MAI from the received signals of the other users experienced by the individual user signal being decoded.