过载率对上行SCMA系统影响分析

doi:10.11959/j.issn.1000-0801.2018115

电信科学 ›› 2018, Vol. 34 ›› Issue (6): 64-71.doi: 10.11959/j.issn.1000-0801.2018115

过载率对上行SCMA系统影响分析

张宏扬,郑长亮,陆宇,刘华平

杭州电子科技大学通信工程学院，浙江杭州 310018

修回日期:2018-02-09 出版日期:2018-06-01 发布日期:2018-07-03
作者简介:张宏扬（1991-），男，杭州电子科技大学硕士生，主要研究方向为非正交多址接入。|郑长亮（1980-），男，博士，杭州电子科技大学讲师，主要研究方向为无线通信、移动通信等。|陆宇（1977-），男，杭州电子科技大学副教授、硕士生导师，主要研究方向为高效视频压缩方法、立体视频处理等。|刘华平（1965-），男，博士，杭州电子科技大学特聘教授、硕士生导师，美国俄勒冈州立大学终身教授，主要研究方向为无线通信理论、无线传感网络和信号处理等。
基金资助:
国家自然科学基金资助项目(61671282);国家自然科学基金资助项目(61471153);杭州电子科技大学科研启动基金资助项目(KYS085614014);杭州电子科技大学科研启动基金资助项目(ZX150204307002/00);“电子科学与技术”浙江省一流学科A类资助项目(GK178800207001/029)

Impact of overload factor on uplink SCMA system

Hongyang ZHANG,Changliang ZHENG,Yu LU,Huaping LIU

School of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China

Revised:2018-02-09 Online:2018-06-01 Published:2018-07-03
Supported by:
The National Natural Science Foundation of China(61671282);The National Natural Science Foundation of China(61471153);Scientific Research Foundation of Hangzhou Dianzi University(KYS085614014);Scientific Research Foundation of Hangzhou Dianzi University(ZX150204307002/00);The Open Research Foundation of “Electronics Science and Technology” Top-ranking Discipline Class A in Zhejiang Province(GK178800207001/029)

摘要/Abstract

摘要：

稀疏码多址接入（sparse code multiple access，SCMA）以其优异性能成为5G多址接入技术的热门候选，而海量接入是 5G 所面临的主要挑战之一，SCMA 自然要承受过载传输的考验。针对这一问题，探究了上行SCMA系统在不同过载传输场景中的性能表现。首先，从误码率性能与检测复杂度两个方面，分析系统过载率对系统检测译码的影响；其次，通过建立系统过载率与系统平均和速率的关系模型，分析系统过载率对系统传输速率的影响；最后，通过实验仿真验证分析的合理性与准确性。

关键词: 5G, 稀疏码多址接入, 消息传递算法, 过载率

Abstract:

Sparse code multiple access (SCMA) is regarded as a promising multiple access technology for 5G because of its excellent performance.One of the major challenges that 5G networks are facing is the massive connectivity in terms of both data volume and the number of devices,thus SCMA must be capable of coping with transmission overload.Analyzing the performance of the uplink SCMA system in overloading scenarios was focused on.At first,the influence of the overloading factor on the detection and decoding complexities and error performances of the uplink SCMA system were analyzed.Then,by establishing the relationship between the overloading factor and the average sum-rate,the impact of the overloading factor on the transmission rate of the uplink SCMA system was analyzed.Extensive numerical results are provided to verify the accuracy and insights derivable from the analytical results.

Key words: 5G, sparse code multiple access, message passing algorithm, overloading factor

中图分类号:

TN929.5

张宏扬,郑长亮,陆宇,刘华平. 过载率对上行SCMA系统影响分析[J]. 电信科学, 2018, 34(6): 64-71.

Hongyang ZHANG,Changliang ZHENG,Yu LU,Huaping LIU. Impact of overload factor on uplink SCMA system[J]. Telecommunications Science, 2018, 34(6): 64-71.

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运算种类	次数
加法运算	(2N·OF+1)M^N·OF· KNn·OF+(d_v-2)MKNn·OF+2 MKN·OF
乘法运算	(N·OF+2)M^N·OF·KNn·OF+4MKN·OF
指数运算	M^N·OF· KNn·OF

场景	检测算法	n	J	K	OF
1	MPA	6	4	4	100%
2	MPA	6	6	4	150%
3	MPA	6	8	4	200%

过载率对上行SCMA系统影响分析

Impact of overload factor on uplink SCMA system

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