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

Georg Böcherer

doi:10.1109/TCOMM.2015.2494016

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

2015-12-01

638

Georg Böcherer *

Fabian Steiner

Patrick Schulte

DOI：10.1109/TCOMM.2015.2494016

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Abstract

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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 10(-3), the new scheme operates within less than 1.1 dB of the AWGN capacity 1/2 log(2)(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.

Keywords:

Rate adaptation

Probabilistic shaping

Bandlimited communication

Modulation

Amplitude-shift keying

Quadrature amplitude modulation

Forward error correction