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User-Load-Compatible Masking Schemes for Raptor-Like Protograph-Based LDPC Codes in Gaussian Multiple Access Channels
- Source :
- IEEE Transactions on Vehicular Technology. 70:7652-7664
- Publication Year :
- 2021
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2021.
-
Abstract
- In this paper, the backward-compatible coding schemes are explored to achieve the near-capacity performances in dynamic LDPC-coded Gaussian multiple access channels (GMAC). Specifically, some user-load-compatible (ULC) masked edges in a raptor-like protograph are masked with the variation of user load $u$ . To distinguish the edges in a protograph, a multi-user protograph-based extrinsic information transfer (MU-PEXIT) chart is developed. Based on this chart, an iterative edge selection algorithm combined with a theoretical simplification is proposed to facilitate the selection of independent masked edge sets (MESs) for varying $u$ . To further decrease the complexity of the independent masking scheme, a nested version is presented, where the MESs for varying $u$ are nested and derived from the same mother MES. Meanwhile, nested selection algorithms are provided to select the nested MESs. Extensive simulation results demonstrate that the masked 5G-NR LDPC codes can maintain near-capacity performances regardless of the variation of $u$ . Besides, these ULC masked codes achieve comparable performances with the state-of-the-art LDPC codes which are specially re-designed in a static GMAC.
- Subjects :
- Masking (art)
Information transfer
Computer Networks and Communications
Computer science
Gaussian
Aerospace Engineering
symbols.namesake
Chart
Automotive Engineering
symbols
Enhanced Data Rates for GSM Evolution
Electrical and Electronic Engineering
Low-density parity-check code
Algorithm
Selection algorithm
Coding (social sciences)
Subjects
Details
- ISSN :
- 19399359 and 00189545
- Volume :
- 70
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Vehicular Technology
- Accession number :
- edsair.doi...........af6f13f73629a143c6b465d83c026716