Patent ID: 6693568
Filing Date: 2004-02-17
Classification: H04L

Abstract:
In a receiver operable in a communication system to receive transmitted digital data, the transmitted digital data transmitted to the receiver upon a channel susceptible to distortion, the transmitted digital data of values at least representative of values of sending-station digital data, an improvement of apparatus for recovering values of the sending-station digital values responsive to detection at the receiver of the transmitted digital data, said apparatus comprising:a reliability indicia generator coupled to receive a sequence of the transmitted digital data, said reliability indicia generator for forming reliability indicia associated with possible values of a corresponding sequence of the sending-station digital data; a trellis detector coupled to said reliability indicia generator to receive indications of the reliability indicia formed by said reliability indicia generator and coupled to receive the indications of the transmitted digital data, said trellis detector defined by a matrix of nodes, said trellis detector for trellis-decoding the sequence of the transmitted digital data to detect the values thereof, said trellis detector of a trellis node-size reduced by at least one trellis node responsive to values of the indications of the reliability indicia.