Probabilistic Shaping for Protograph LDPC-Coded Modulation by Residual Source Redundancy

Probabilistic amplitude shaping (PAS) has proved to be a promising way to achieve the shaping gain for an additive white Gaussian noise channel with a distribution matcher (DM). However, the DM schemes may suffer a rate loss and increase both complexity and latency, when they are not suited for the...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 69; no. 7; pp. 4267 - 4281
Main Authors: Chen, Chen, Chen, Qiwang, Wang, Lin, He, Yu-Cheng, Chen, Yifan
Format: Journal Article
Language:English
Published: New York IEEE 01.07.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Channel coding
Coded modulation
Codes
Coding
Decoding
Design optimization
Floors
joint source and channel coding
Modulation
Parity check codes
probabilistic amplitude shaping
Probabilistic logic
Probability distribution
protograph LDPC codes
Random noise
Redundancy
residual source redundancy
Source code
Source coding
Statistical analysis
ISSN:0090-6778, 1558-0857
Online Access:Get full text
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Summary:Probabilistic amplitude shaping (PAS) has proved to be a promising way to achieve the shaping gain for an additive white Gaussian noise channel with a distribution matcher (DM). However, the DM schemes may suffer a rate loss and increase both complexity and latency, when they are not suited for the input bit stream with redundancy. In this paper, a novel PAS strategy is proposed for a joint source and channel coded modulation system, where the residual source redundancy after source coding can be exploited to obtain both shaping and coding gains. It is shown that the residual source redundancy can be controlled by choosing the row weight distribution for source code, thus making the probability distribution of the modulated symbols be optimized under an appropriate interleaver design. To guarantee the error-floor performance, the source code is constrained by predicting the probability distribution of source bits within target finite-length frames. By jointly designing source and channel codes, the residual source redundancy can also be exploited to achieve the coding gain. Compared with the state-of-the-art code pairs, the proposed code pairs have better error-floor performance, and achieve higher coding and shaping gains without suffering from the rate-loss and the latency caused by DM.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2021.3071117