Title :
Soft decision metrics for differentially encoded QPSK
Author :
Bisplinghoff, A. ; Cabirol, C. ; Langenbach, S. ; Sauer-Greff, W. ; Schmauss, B.
Author_Institution :
Univ. of Erlangen, Erlangen, Germany
Abstract :
We investigate phase slip aware soft decision metrics for coherently demodulated differentially encoded QPSK. A low-complexity approximation of a suitable metric has negligible penalty with practical soft decoders and is robust against residual phase noise.
Keywords :
Viterbi decoding; differential detection; matrix algebra; optical signal detection; phase noise; quadrature phase shift keying; QPSK; coherent detection; differentially encoded modulation; residual phase noise; soft decision metrics; soft decoders; Approximation methods; Bit error rate; Decoding; Measurement; Phase noise; Phase shift keying; Signal to noise ratio;
Conference_Titel :
Optical Communication (ECOC), 2011 37th European Conference and Exhibition on
Conference_Location :
Geneva
Print_ISBN :
978-1-4577-1918-9
