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3D EXIT charts for analysing the 5G 3GPP new radio LDPC decoder

3D EXIT charts for analysing the 5G 3GPP new radio LDPC decoder
3D EXIT charts for analysing the 5G 3GPP new radio LDPC decoder
Density Parity Check (LDPC) codes have been selected to provide channel coding for data in the next generation of wireless communication standard referred to in practice as the 3GPP New Radio (NR). In contrast to the LDPC codes adopted in previous standards, the NR LDPC code can be considered to be a concatenation of a core LDPC code and a Low Density Generator Matrix (LDGM) code. This particular feature has the advantage of offering flexible coding rate, but it prevents the application of conventional extrinsic information transfer (EXIT) chart analysis. This paper characterizes this problem and addresses it using a novel reinterpretation of the NR LDPC factor graph. Based on this factor graph, a novel 3D EXIT chart technique is conceived for our three-stage scheme, which facilitates the visual characterisation of the NR LDPC decoder's iterative decoding convergence process for the first time. The proposed EXIT chart analysis accurately visualizes the mutual information exchange amongst the components of the NR LDPC decoder, which was not facilitated by the conventional 2D EXIT chart. We demonstrate the power of this technique by using it to design a novel iterative decoding activation order for the NR LDPC decoder, which reduces the decoding complexity by approximately 17% compared to a conventional flooding decoder. This is achieved without degrading its error correction capability. We conclude by discussing several other opportunities for exploiting the proposed 3D EXIT chart technique to improve the design of concatenated LDPC and LDGM codes.
NR LDPC code, EXIT chart analysis, NR LDPC Decoder design
2169-3536
Shao, Shuai
59ba0bf5-d953-4967-8655-4de394007f2a
Zhang, Yangyishi
d5f57adf-3d5c-4131-84b7-0113a4b2b2b7
Maunder, Robert
76099323-7d58-4732-a98f-22a662ccba6c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Shao, Shuai
59ba0bf5-d953-4967-8655-4de394007f2a
Zhang, Yangyishi
d5f57adf-3d5c-4131-84b7-0113a4b2b2b7
Maunder, Robert
76099323-7d58-4732-a98f-22a662ccba6c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Shao, Shuai, Zhang, Yangyishi, Maunder, Robert and Hanzo, Lajos (2020) 3D EXIT charts for analysing the 5G 3GPP new radio LDPC decoder. IEEE Access. (In Press)

Record type: Article

Abstract

Density Parity Check (LDPC) codes have been selected to provide channel coding for data in the next generation of wireless communication standard referred to in practice as the 3GPP New Radio (NR). In contrast to the LDPC codes adopted in previous standards, the NR LDPC code can be considered to be a concatenation of a core LDPC code and a Low Density Generator Matrix (LDGM) code. This particular feature has the advantage of offering flexible coding rate, but it prevents the application of conventional extrinsic information transfer (EXIT) chart analysis. This paper characterizes this problem and addresses it using a novel reinterpretation of the NR LDPC factor graph. Based on this factor graph, a novel 3D EXIT chart technique is conceived for our three-stage scheme, which facilitates the visual characterisation of the NR LDPC decoder's iterative decoding convergence process for the first time. The proposed EXIT chart analysis accurately visualizes the mutual information exchange amongst the components of the NR LDPC decoder, which was not facilitated by the conventional 2D EXIT chart. We demonstrate the power of this technique by using it to design a novel iterative decoding activation order for the NR LDPC decoder, which reduces the decoding complexity by approximately 17% compared to a conventional flooding decoder. This is achieved without degrading its error correction capability. We conclude by discussing several other opportunities for exploiting the proposed 3D EXIT chart technique to improve the design of concatenated LDPC and LDGM codes.

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NRLDPC_ACCESS_Journal.pf - Accepted Manuscript
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More information

Accepted/In Press date: 4 October 2020
Keywords: NR LDPC code, EXIT chart analysis, NR LDPC Decoder design

Identifiers

Local EPrints ID: 444473
URI: http://eprints.soton.ac.uk/id/eprint/444473
ISSN: 2169-3536
PURE UUID: 95b951d2-d634-42b4-be34-7cbf785aa218
ORCID for Shuai Shao: ORCID iD orcid.org/0000-0003-4135-7973
ORCID for Robert Maunder: ORCID iD orcid.org/0000-0002-7944-2615
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 20 Oct 2020 16:33
Last modified: 18 Feb 2021 17:28

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