Improving Polar-Coded SCMA System by Information Coupling and Parity Check.

Xi Wu,Yafeng Wang

doi:10.3390/s20236740

Abstract

In this paper, the uplink information-coupled polar-coded sparse code multiple access (PC-SCMA) system is proposed. For this system, we first design the encoding method of systematic joint parity check and CRC-aided (PCCA) polar code. Using the systematic PCCA-polar code as base code, the partially information-coupled (PIC) polar code is constructed. Then, a joint iterative detection and successive cancellation list (SCL)-decoding receiver is proposed for the PC-SCMA system. For the receiver, the coupled polar decoder’s extrinsic messages are calculated by the Bayes rule and soft cancellation (SCAN) algorithm. Based on the extrinsic information transfer (EXIT) idea, the PIC PCCA-polar code is optimized. Simulation results demonstrate that the PIC PCCA-PC-SCMA system outperforms the other polar (or LDPC) coded SCMA systems at various code rates and channel configurations. Additionally, compared with an uncoupled PC-SCMA system with SCL decoder, the complexity of PIC PCCA-PC-SCMA is reduced at a high

Highlights

With the rapid increasing demand of the future mobile wireless network, new requirements are put forward for the communication technologies and the applications
Many non-orthogonal multiple access (NOMA) schemes were proposed for 5G, such as the sparse code multiple access (SCMA) [1], pattern division multiple access (PDMA) [2], multi-user shared access (MUSA) [3], low-density signatures (LDS) multiple access [4], and so on
The uplink polar-coded sparse code multiple access (PC-SCMA) system is improved by information coupling and parity check

Summary

Introduction

With the rapid increasing demand of the future mobile wireless network, new requirements are put forward for the communication technologies and the applications. The typical application scenarios of the fifth generation (5G) wireless networks consist of enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC) and Ultra-Reliable and Low Latency. For 5G scenarios, the non-orthogonal multiple access (NOMA) has been proposed to increase the system throughput and accommodate massive communication connectivity. As opposed to orthogonal multiple access (OMA), the NOMA has low transmission latency and signaling cost. Many NOMA schemes were proposed for 5G, such as the sparse code multiple access (SCMA) [1], pattern division multiple access (PDMA) [2], multi-user shared access (MUSA) [3], low-density signatures (LDS) multiple access [4], and so on. Due to the sparsity of the codebook, the message passing algorithm (MPA) [5] with moderate complexity can be used for multi-user detection (MUD)

Methods

Results

Conclusion