Burst error characteristics in probabilistic constellation shaping

Abstract

Bit error rate (BER) characteristics of Probabilistic Amplitude Shaping system is evaluated with a novel matching improvement operation at an inverse-distribution matcher (DM^-1) using soft information of log-likelihood ratio value as well as an interleaving of multiple BCH (Bose-Chaudhuri-Hocquenghem) codewords used as outer forward error correction (FEC). The obtained results show that the large size interleaver dramatically eliminates BER floor, while the proposed matching improvement operation successfully suppresses the increase in errors due to burst errors occurred in the DM^-1 process and low-density parity-check code (LDPC) process used as an internal FEC.