Patent ID: 6222889
Filing Date: 2001-04-24
Classification: H03M

Abstract:
A trellis decoding system, comprising:a memory, fed by a sequence of received signals, for storing said sequence of received signals, such signals having been encoded prior to transmission by a trellis encoder as a sequence of symbols wherein each of the symbols represents an allowed transition from an originating state to a predetermined limited number of terminating states;a trellis decoder, fed by said sequence of received signals, for decoding the sequence of received signals; anda soft decision generator, responsive to the signals stored in the memory and to the output of the trellis decoder, for determining a soft decision parameter representative of confidence level of the trellis decoder in properly decoding the received signal into each one of the symbols and for tagging such soft decision parameter to each one of such symbols subsequent to the trellis decoder decoding the sequence of received signals into the corresponding sequence of symbols.