Patent ID: 6516037
Filing Date: 2003-02-04
Classification: H03M,H04L

Abstract:
A method for use in a multilevel coded modulation arrangement comprising the steps ofencoding a first portion of a stream of input data using a first code, encoding a second portion of said stream of input data using a second code, generating sequences of signal points selected from a predetermined signaling constellation in response to the encoded first and second portions, said first code identifying sequences of signal point subsets, and applying said sequences of signal points to a channel, characterized in that said first code is such that every different pair of identified sequences of signal point subsets differs in at least M subset positions, where M is a desired level of time diversity, and said second code is such as to ensure that every different pair of valid sequences of signal points taken from the same sequence of signal differs in at least M signal point positions thereby providing an overall multilevel code of said desired level of time diversity and thereby does not cause an increase in the minimum distance between different ones of the sequences of signal points of said overall multilevel code.