复合衰落信道下分布式MIMO系统中断概率及信道容量分析

doi:10.11959/j.issn.1000-436x.2015052

摘要/Abstract

摘要：

针对分布式MIMO系统中断概率和信道容量这2大性能指标，在复合衰落信道模型下，当上行链路采用最大比发送—选择合并，下行链路采用选择发送—最大比合并时，利用Lognormal分布对复杂Gamma-Lognormal分布的近似，推导得到当移动台位置给定时，系统中断概率和信道容量的闭合表达式，证明了系统性能指标与移动台分布之间存在密切的联系；随后依照实际通信环境，提出一种考虑存在小区热点的移动台非均匀分布模型，然后推导得到考虑该分布模型后的系统平均中断概率和平均信道容量闭合表达式；最后通过计算机仿真，证明了所提近似处理的精确性以及各项理论分析的合理性。

关键词: 分布式MIMO, 复合衰落信道, 中断概率, 信道容量, 移动台分布

Abstract:

The exact closed-form expressions about the outage probability and capacity of distributed MIMO systems over a composite fading channel are derived firstly by using Lognormal approximation to complicated Gamma-lognormal distribution when mobile station (MS) in the cell is fixed at some position and the so-called maximum ratio transmission/selected combining (MRT-SC) and selected transmission/maximum ratio combining (ST-MRC) schemes are adopted in uplink and downlink respectively.Then based on a newly proposed non-uniform MS cell distribution model,which is more consistent with the MS cell hotspot distribution in an actual communication environment,the average outage probability and capacity formulas synthesizing the MS cell position information are further derived.Finally,the accuracy of the approximation method and the rationality of the corresponding theoretical analysis about the system performance are proven and illustrated by computer simulations.

Key words: distributed MIMO, composite fading channel, outage probability, capacity, MS distribution

彭文杰,李岳衡,薛团结,居美艳,黄平. 复合衰落信道下分布式MIMO系统中断概率及信道容量分析[J]. 通信学报, 2015, 36(2): 221-230.

Wen-jie PENG,Yue-heng LI,Tuan-jie XUE,Mei-yan JU,Ping HUANG. Outage probability and capacity analysis of distributed MIMO systems over a composite fading channel[J]. Journal on Communications, 2015, 36(2): 221-230.

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参数	取值
小区边长D	500 m
移动台天线数L	1, 2^*, 3
Nakagami衰落系数m_i	0.5, 1^*, 3, 4
参考距离d₀	40 m
路径损耗指数β	3.5, 4^*, 4.5
阴影衰落标准差σ	8 dB
信噪比门限γ_th	0 dB
移动台分布参数λ	0.7
移动台密集区半径r	350 π
Hermite多项式阶数N	20
极径节点数P	20
极角节点数Q	20

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