过载率对上行SCMA系统影响分析

doi:10.11959/j.issn.1000-0801.2018115

Abstract

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

CLC Number:

TN929.5

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

Figures/Tables 9

References 20

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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%

场景	系统	J	K	OF	d₀	α
1	OFDMA	4	4	-	3	4
2	SCMA	6	4	150%	3	4
3	SCMA	8	4	200%	3	4

Impact of overload factor on uplink SCMA system

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