Method of processing signals in a viterbi decoder according to delayed decision feedback sequence estimation (DDFSE) algorithm

摘要

A method of digital telecommunication via an electrical cable is provided, whereby the symbols of a data stream to be transmitted are supplied as a transmission signal to a transmission path, after undergoing a digital-to-analog conversion. The transmission signal is received and sampled at the end of the transmission path on a receiving side. To further process the received signal on the receiving side, a Viterbi decoder operating on the basis of a trellis diagram is used. The Viterbi decoder uses a number of feedback filters to determine branch or path metrics in the trellis diagram, where this number is a function of the number of states in the trellis diagram. To determine the branch metrics in the trellis diagram, separate first feedback filters (8) are only used up to a specifiable number of symbol intervals in the trellis diagram, or up to a specifiable length of feedback filters for all states in the trellis diagram. A common feedback filter (9) is used for the other symbol intervals in the trellis diagram, to which the symbols of the path with the smallest path metrics at the end of the first feedback filter (8) in the trellis diagram are supplied.