Patent ID: 8855221
Filing Date: 2014-10-07
Classification: H04L

Abstract:
1. A receiver for use in an orthogonal frequency division multiplexing (OFDM) wireless communication system to receive signals from a transmitter that transmits the signals using OFDM and bit interleaved coded modulation, the receiver comprising: an inner decoder structure having an adaptive front end, the inner decoder structure communicatively coupled to receive extrinsic information, the adaptive front end to utilize the extrinsic information from one or more prior decoder iterations and channel information corresponding to a portion of the received signals, to generate one or more filtered signal estimates, and to receive the one or more filtered signal estimates, the inner decoder structure having a soft output M-algorithm (SOMA) based multiple-in multiple-out (MIMO) demapper that utilizes the one or more filtered signal estimates to perform inner demapping over each tone, wherein the adaptive front end modifies subspace decomposition and metric calculations for each level of a tree utilized by the SOMA demapping; and an outer decoder communicatively coupled with the inner decoder to perform iterative decoding and to provide extrinsic information related to the iterative decoding to the adaptive front end.