A new block-coded modulation scheme for Rayleigh fading channel,soft output decoding issues

摘要

We investigate the application of the sum-product algorithm to thedecoding of a q-ary block-coded modulation (BCM) scheme which is basedon extending the parity check equations of a binary block code to q-arysymbols. This is achieved by decomposing the code into a sub-code withan acyclic Tanner graph and its cosets which are represented by atrellis diagram. The combination of these two cycle-free graphs are usedto develop an efficient soft output decoding algorithm for the givencode