5G移动通信中基于同频干扰分布的协同分布式天线传输系统

doi:10.13229/j.cnki.jdxbgxb20190199

Abstract

Abstract:

In order to study the performance of downlink in 5G wireless cellular system, Cooperative Distributed Antenna Transmission (CDAT) is a feasible scheme. When using Frequency Division Multiple Access (FDMA), the CDAT technology inevitably causes interference overload, resulting in the increase in Peak-to-Average Signal Power Ratio (PAPR) of transmitted signals, which will lead to a certain decline in channel quality. To solve this problem, this paper theoretically proposes a joint downlink Minimum Mean Square Error (MMSE) and spatial diversity receiving method in multi-carrier systems. In the case of adjacent macro-cell co-channel interference, Space-Time Block Coded Transmit Diversity (STBC-TD) for spatial diversity, MMSE filtering and MMSE-SVD for multiuser spatial multiplexing are described. In order to restrain PAPR growth under CDAT, Blind-Selected Mapping (SLM) is introduced based on co-channel interference distribution. The detailed mathematical expressions of STBC, Co-Channel Interference (CCI), Signal-to-Interference Noise Ratio (SINR) and Bit Error Ratio (BER) are given. Finally, Monte Carlo computer simulation results show that, under the same BER condition, the SNR performance of the system can be improved by about 1dB. Therefore, the CDAT way with full consideration of CCI can improve the system capacity more effectively. It also provides a new way for studying the downlink performance of wireless cellular multi-access system.

Key words: communication technology, co-channel interference (CCI), inter-cellular interference(ICI), diversity, peak-to-average signal power ratio (PAPR)

CLC Number:

TN929.52

Jin-peng WANG,Zheng-peng YE,Fan CAO,Nian-yu ZOU. Cooperative distributed antenna transmission method based on co-channel interference in 5G mobile communication system[J].Journal of Jilin University(Engineering and Technology Edition), 2020, 50(1): 333-341.

Figures/Tables 9

Fig.1

Fig.2

Table 1

Fig.3

Fig.4

Table 2

Computation condition"

发送端和接收端	单载波上行链路	频分复用	STBC?TDw/R _x?FDE
		多用户空间复用	MMSE?SVD
	正交频分复用OFDM 下行链路	频分复用	STBC?TDw/T _x?FDE
		多用户空间复用	MMSE?SVD
	子载波数量 $N c$		$128$
	用户接口GI的长度 $N g$		$32$
	单一宏蜂窝中采用的分布式天线数量 $N m a c r o$		$7$
	用户终端UE的天线数 $N u e$		2
	移动基站终端的分布式天线数 $N m b s$		4
	信道状态信息		Ideal
无线传播信道	路径损耗指数 $α$		$3.5$
	遮挡衰减系数 $σ$ / $d B$		$7.0 ?$
	信道衰落模型		Frequency?selective block Nakagami?Rice and Rayleigh
	Nakagami莱斯信道的系数 $K$ / $d B$		$10 ?$
	功率延迟模式的指数 $L$		$16 - u n i f o r m$

Table 2

Fig.5

Fig.6

Fig.7

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N _t	N _r	J	Q	Coding rate
1	任意值	1	1	1
2		2	2	1
3		3	4	3/4
4		3	4	3/4
5		10	15	2/3
6		20	30	2/3

Cooperative distributed antenna transmission method based on co-channel interference in 5G mobile communication system

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