Patent ID: 8000416
Filing Date: 2011-08-16
Classification: H04L

Abstract:
1. A method for generating soft output for a received signal in a multiple input, multiple output (MIMO) receiver, comprising: estimating a channel matrix H from signals y received at a plurality of antennas via corresponding channels; decomposing, using M parameters, the channel matrix H to obtain a unitary matrix Q and upper triangular matrix R; determining, in an M parameter QR decomposition (QRD-M) detection unit, a set of candidate decision vectors based on the matrices Q and R and the received signals y; determining, in a Markov chain Monte Carlo (MCMC) detection unit, an important subset of the set of candidate decision vectors; and determining, in a log-likelihood ratio unit, a soft output using the important subset, wherein a relation between transmitted signals d and the received signals y is y=Hd+n, where y ε C where H=QR, Q ε C N ×N is the unitary matrix and where T ε C N ×N is the upper-triangular matrix, and wherein the MCMC detection unit determines a Euclidean distances according to where |ω| 2 is the Euclidean distance, r k , t k,l ,d l are the entries of vectors r,d and matrix T.