Digital transmission system, decoder and decoding method

摘要

A digital transmission system utilizing data coding at the transmitter and data decoding at the receiver, the decoding being iterative, reliability data about soft decisions being calculated for each iteration. The last iteration results in a hard decision. Soft decisions are transformed so as to normalize the mean value of the reliability data, using evolutive weighting of the soft decisions with the received data. The coding is preferably a product code concatenated with a block code such as, for example, a Reed Solomon code. Such coding is well suited to upstream transmission in an interactive satellite communication system.