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

摘要/Abstract

摘要：

针对协同分布式的天线传输（CDAT）技术在使用频分多址(FDMA)时，不可避免地造成干扰的过载，致使发射信号峰均比（Peak-to-average signal power ratio, PAPR）增加的问题，从理论上提出了一种多载波系统中下行链路的结合MMSE和空间分集联合接收方法。首先，在相邻宏单元共道干扰的情况下，描述了用于空间分集的空时分组编码传输分集（STBC-TD），以及用于多用户空间复用的最小均方误差滤波和奇异值分解（MMSE-SVD）。然后，为了抑制CDAT作用下PAPR的增大，由同频干扰(CCI)分布着手，引入了不需要无线终端信息传输的盲选择映射（Blind SLM），同时给出了STBC、CCI、SINR及BER的详细数学表达。蒙特-卡洛的仿真结果表明：在相同误码率BER条件下，相比于传统方式，本文算法对系统的信噪比性能可以提高1 dB左右。该方案在充分考虑了同频干扰CCI后，CDAT算法可以更为有效地提高系统容量，其也为研究无线蜂窝多接入系统下行链路的性能提供了一种新的思路。

关键词: 通信技术, 同频干扰, 互扰, 分集, 信号峰均比

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)

中图分类号:

TN929.52

王金鹏,叶政鹏,曹帆,邹念育. 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[J]. 吉林大学学报(工学版), 2020, 50(1): 333-341.

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.

图/表 9

图1

图2

表1

图3

图4

表2

仿真条件设定"

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 $L$		$16 - u n i f o r m$

表2

图5

图6

图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