Abstract
As the fifth-generation (5G) wireless networks’ key technology, the joint design of SCMA and polar code is concerned by the future communication system. In this paper, a CRC aided joint iterative detection and successive cancellation list (SCL) decoding (CAJIDS) receiver is proposed for the polar coded SCMA (PC-SCMA) system. For the receiver, the SCL decoder’s extrinsic messages construction algorithm is designed by using Bayes rule and soft cancellation algorithm. Additionally, the distributed CRC aided polar (DCA-polar) code and variable list size are used to reduce the receiver’s decoding latency and complexity. Simulation results demonstrate that the CAJIDS receiver has better error rate performance than the joint iterative detection and decoding (JIDD) receiver. It also outperforms the LDPC coded SCMA (LDPC-SCMA) system. Specifically, when code length $N=256$ and code rate $R = 1/3$ , the CAJIDS outperforms the JIDD and LDPC-SCMA 1.2 dB and 1.9 dB over the Rayleigh fading channel, respectively. It also shows that, compared with the fixed-list-size receiver, with a similar error rate performance, the CAJIDS receiver has lower decoding latency and complexity.
Highlights
W ITH the development of mobile internet, more and more devices are connected to the mobile network
We focus on polar coding, which is applicable to LDPC or Turbo codes
At the code rate R = 1/3, the performance gain of DAJIDS achieves about 1.2 dB and 1.9 dB compared with the LDPC-sparse code multiple access (SCMA) and joint iterative detection and decoding (JIDD), respectively
Summary
W ITH the development of mobile internet, more and more devices are connected to the mobile network. 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 Communications (URLLC). For the 5G scenarios, non-orthogonal multiple access (NOMA) is an essential enabling technology to meet the heterogeneous demands on low latency, high reliability, massive connectivity, improved fairness, and high throughput [1]. Many NOMA schemes were proposed for 5G, such as the sparse code multiple access (SCMA) [2], pattern division multiple access (PDMA) [3], multi-user shared access (MUSA) [4], low-density signatures (LDS) multiple access [5], and so on. Since the LDPC code can achieve good error-rate performance and is hardware-friendly for high-throughput realization when the code length is moderate, it is used as the outer channel coding scheme for VOLUME 4, 2016.
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