Patent ID: 7187728
Filing Date: 2007-03-06
Classification: H04L

Abstract:
1. A method of determining coding parameters of a convolution decoder for improving coding gain in a receiver for receiving carrier signals modulated with sixteen different digital states, comprising the step of: a) using a 2 ASK/8 PSK coding; b) selecting a deconvolution code for the decoder and determining all possible code word sequences with a free distance of the deconvolution code; c) forming possible mappings by allocating a partial set of 2 ASK/8 PSK channel bits into subsets; and d) selecting the possible mappings in which, after determining optimal radii of two amplitudes for each possible mapping, a minimal Euclidean distance produced between two possible subset becomes maximal thereby improving the coding gain, the optimal radii denoted by ac and c being determined by the following equations: in which d d d