Patent ID: 8331495
Filing Date: 2012-12-11
Classification: H04L

Abstract:
1. A method in a wireless communication receiver of decoding modem bits from a received sequence of symbols comprising: computing joint metrics, performed by a processor of the wireless communication receiver, each joint metric corresponding to a subset of the modem bits conveyed in the received sequence of symbols and indicating likelihoods for those modem bits taking on certain bit values, wherein computing the joint metrics comprises of computing Equation 7 comprising: where triplet (i,j,k) denotes two consecutive connected branches, (i,j) from index t, and (j,k) from index t+1, set ω′(x,y) contains the triplets (i,j,k), where branch (i,j) has bit x set to 0 or 1, and branch (j,k) has bit y set to 0 or 1, M generating side information for at least some of the modem bits represented in the joint metrics, wherein the side information for a given modem bit indicates that the given modem bit is more likely to have a particular bit value; combining each joint metric with the side information for one or more modem bits represented in the joint metric, to obtain refined soft values for one or more remaining modem bits represented in the joint metric; for those remaining modem bits that are coded, decoding the refined soft values to recover corresponding modem bits from the received sequence of symbols, and for those remaining modem bits that are uncoded, producing an improved estimate.