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A new coded modulation scheme is proposed. At the transmitter, theconcatenation of a distribution matcher and a systematic binary encoderperforms probabilistic signal shaping and channel coding. At the receiver, theoutput of a bitwise demapper is fed to a binary decoder. No iterative demappingis performed. Rate adaption is achieved by adjusting the input distribution andthe transmission power. The scheme is applied to bipolar amplitude shift keying(ASK) constellations with equidistant signal points and it is directlyapplicable to two-dimensional quadrature amplitude modulation (QAM). The schemeis implemented by using the DVB-S2 low-density parity-check (LDPC) codes. At aframe error rate of 1e-3, the new scheme operates within less than 1 dB of theAWGN capacity 0.5log2(1+SNR) at any spectral efficiency between 1 and 5bits/s/Hz by using only 5 modes, i.e., 4-ASK with code rate 2/3, 8-ASK with3/4, 16-ASK and 32-ASK with 5/6 and 64-ASK with 9/10.

Bandwidth Efficient and Rate-Matched Low-Density Parity-Check Coded Modulation