NDLI: Optimisation of convergence-aware coded PDMA for 5G wireless systems

Content Provider	IET Digital Library
Author	Xu, Jin Han, Xueqin Ding, Hanqing Li, Zhigang Yu, Zeqi Dai, Xiaoming
Abstract	Orthogonal frequency division multiplexing-based pattern division multiple access (PDMA) is considered as a promising multiple access scheme for future wireless communication systems due to its high spectral efficiency and powerful ability to support massive users. In this study, it is shown that two pattern matrices with unequal diversity gain in the PDMA system have better convergence performance compared with the signature matrices in a traditional low-density signature multiple access system by simulations and extrinsic information transfer (EXIT) chart analysis. For a low-density parity check (LDPC)-coded PDMA system, the EXIT characteristics between the front-end multiple-user detector (MUD) and the LDPC decoder may be mismatch, which usually leads to degraded performance when an iterative detection and decoding algorithm is used. To overcome this problem, a two-stage iterative optimisation algorithm, which is easy to implement is proposed to find an optimal (near optimal) degree distribution pair for the LDPC code. Both EXIT chart analysis and simulation results demonstrate that the proposed algorithm exhibits further performance gain compared with regular (3,6) LDPC-coded systems under both an additive white Gaussian noise channel and a Rayleigh fading channel.
Starting Page	243
Ending Page	250
Page Count	8
ISSN	17518628
Volume Number	13
e-ISSN	17518636
Issue Number	Issue 2, Jan (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/13/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.5429
Journal	IET Communications
Publisher Date	2018-10-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	5G Mobile Communication 5G Wireless Systems Additive White Gaussian Noise Channel AWGN Channel Code Convergence-aware Coded PDMA Decoding Decoding Algorithm EXIT Characteristic EXIT Chart Analysis Extrinsic Information Transfer Chart Analysis Front-end Multiple-user Detector Interpolation And Function Approximation Iterative Detection Iterative Method LDPC Decoder LDPC-coded PDMA System Linear Algebra Low-density Parity Check-coded PDMA System Low-density Signature Multiple Access System Matrix Algebra Mobile Radio System Multi-access System Multiple Access Communication Multiple Access Scheme Multiple-user Detector Numerical Analysis OFDM Modulation Optimal Degree Distribution Pair Optimisation Optimisation Technique Orthogonal Frequency Division Multiplexing System Parity Check Code Pattern Division Multiple Access Pattern Matrix Rayleigh Channel Rayleigh Fading Channel Signature Matrix Spectral Efficiency Two-stage Iterative Optimisation Algorithm Unequal Diversity Gain Wireless Communication System
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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