Koninklijke Philips Corporation N.V.

Américo Brajal

Antoine Chouly

Pierre Chanteau

Reynald Edouard

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.

Digital transmission system, decoder and decoding method

An antenna system () transmits return signals, for example, in the band Ka, based on signals received from a distribution network in the band from 2.5-3 GHz. The return signals are transmitted through the network from a user receiver (PC) with a frequency lying below 65 MHz, they are processed in a frequency converter (up-C) between the network and the antenna system so as to be delivered to the antenna system with a frequency lying in the 2.5-3 GHz band, and frequency management data received in the downstream channel are used in the frequency converter (up-C) for selecting the frequency in the 2.5-3 GHz band.

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Villeneuve-le-Roi, France

Américo Brajal