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

提出了一种新的编码调制方案，采用概率信号塑形和信道编码，通过调整输入分布和传输功率进行速率适应，并使用低密度奇偶校验码实现，适用于二维正交幅度调制，可在 1 至 5 比特 / 秒 / 赫兹的任何频谱效率下操作，而只需使用 5 种模式。