Digitales Kommunikationsverfahren aufgrund weicher Entscheidungen und Apparat

摘要

A decoding apparatus (200) decodes a coherent, differentially encoded multi-level phase shift keying (DEPSK) modulated signal. A coherent receiver (101) receives and, subsequently, outputs the coherent DEPSK modulated signal to a metric computer (201). The metric computer (201) generates a soft decision metric @ (@ (n)) corresponding to the coherent DEPSK modulated signal which is outputted to a forward error correction (FEC) decoder (107). The FEC decoder (107) decodes the coherent DEPSK modulated signal in accordance with the soft decision metric @(@ (n)) corresponding to the coherent DEPSK modulated signal. <IMAGE>