Patent ID: 8654882
Filing Date: 2014-02-18
Classification: H04B,H04L

Abstract:
1. A receiver in a multiple-input multiple-output (MIMO) system, the receiver comprising: a channel estimator configured for estimating a channel based on a receive signal; a minimum mean square error (MMSE) based reciprocal log likelihood ratio (R-LLR) calculator, coupled to the channel estimator, and configured for calculating an R-LLR based on the receive signal and the estimated channel; and a channel decoder, coupled to the MMSE based R-LLR calculator, and configured for decoding the channel and the receive signal based on the calculated R-LLR, wherein the R-LLR is calculated based on reciprocity, and wherein when SINR information for each stream is available or the SINRs for each stream are different, the MMSE based R-LLR calculator is configured for: estimating the transmit symbol by calculating the MMSE solution based on the receive signal and the estimated channel; performing slicing on the estimated transmit symbol; testing whether the reciprocity of the sliced transmit symbol is established or not; calculating an LLR based on the estimated transmit symbol and the sliced transmit symbol; and calculating an R-LLR in which a priori term is added to the LLR, based on the calculated LLR and the establishment or not of the reciprocity.