Patent ID: 8693588
Filing Date: 2014-04-08
Classification: H04L

Abstract:
1. A method for wireless communications, comprising: receiving a signal originating from at least two streams of modulation symbols transmitted from an apparatus; processing the signal to obtain soft symbol estimates and signal-to-noise ratio estimates for the at least two streams; determining a set of candidate constellation points for a first of the at least two streams based on one of the soft symbol estimates for the first stream and one of the signal-to-noise ratio estimates for the first stream; cancelling each of the candidate constellation points from the received signal to obtain an updated received signal for each candidate constellation point from the set; determining, for each of the candidate constellation points, a refined soft symbol estimate and an effective signal-to-noise ratio for a second of the at least two streams based at least on the updated received signal and the signal-to-noise ratio estimates; and computing a log-likelihood ratio for a bit of the second stream based at least on the effective signal-to-noise ratio and the refined soft symbol estimates associated with all the candidate constellation points from the set.