Title :
Efficient Computation of EXIT Functions for Nonbinary Iterative Decoding
Author :
Kliewer, Jorg ; Ng, Soon Xin ; Hanzo, Lajos
Author_Institution :
Commun. Res. Group, Southampton Univ.
Abstract :
The calculation of nonbinary extrinsic information transfer charts for the iterative decoding of concatenated index-based codes is addressed. We show that the extrinsic information at the output of a constituent a posteriori probability decoder can be calculated with very low complexity, where expensive histogram measurements are not required any more. An example for turbo trellis-coded modulation demonstrates the capabilities of the proposed approach
Keywords :
concatenated codes; iterative decoding; maximum likelihood decoding; trellis coded modulation; turbo codes; EXIT functions; a posteriori probability decoder; concatenated index-based codes; extrinsic information transfer charts; nonbinary iterative decoding; turbo trellis-coded modulation; Concatenated codes; Convergence; H infinity control; Histograms; Information analysis; Iterative decoding; Modulation coding; Mutual information; Parity check codes; Probability; Extrinsic information transfer (EXIT) charts; nonbinary iterative decoding; turbo trellis-coded modulation (TTCM);
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2006.885050
