Source-Constrained Hierarchical Modulation Systems With Protograph LDPC Codes: A Promising Transceiver Design for Future 6G-Enabled IoT

This work studies the transceiver design and convergence performance analysis for the hierarchical modulation (HM) systems with protograph-based low-density parity-check (P-LDPC) codes. Specifically, we first conceive new source-constrained (SC) coding scheme and inter-layer-cascaded (ILC) decoding...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications Vol. 43; no. 4; pp. 1103 - 1117
Main Authors: Yang, Zhaojie, Li, Yunye, Guan, Yong Liang, Fang, Yi
Format: Journal Article
Language:English
Published: New York IEEE 01.04.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
AWGN channels
bit-interleaved-coded modulation
Codes
Coding
Constraints
Data transmission
Decoding
Demodulation
Encoding
Error correcting codes
hierarchical modulation
Information systems
Internet of Things
low-density parity-check codes
Modulation
Multiplexing
Performance enhancement
Quadrature amplitude modulation
Quality of service
Simulation
Streams
Transceivers
transmission-rate adaptation
ISSN:0733-8716, 1558-0008
Online Access:Get full text
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Summary:This work studies the transceiver design and convergence performance analysis for the hierarchical modulation (HM) systems with protograph-based low-density parity-check (P-LDPC) codes. Specifically, we first conceive new source-constrained (SC) coding scheme and inter-layer-cascaded (ILC) decoding scheme tailored for the HM-based transmitter and receiver, respectively. Both the proposed SC coding and ILC decoding schemes form an enhanced version of bit-interleaved-coded HM (BIC-HM) systems, namely source-constrained HM (SC-HM) systems, providing a more reliable and flexible multi-data transmission solution. Moreover, according to the SC coding principle, we conceive a novel variable-node-degree-based (VND) multiplexing scheme to further improve the performance of the proposed SC-HM systems. Additionally, based on the ILC decoding framework, we devise a novel mutual information (MI) analysis tool, namely ILC-based extrinsic-information-transfer (ILC-EXIT) algorithm, to predict the decoding thresholds of the proposed P-LDPC-coded SC-HM systems. Theoretical and simulation results demonstrate that the proposed SC-HM systems significantly outperform the existing benchmarks in terms of error performance, decoding latency, and transmission-rate adaptation.
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ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2025.3531540