Spectral Efficiency of Distributed MIMO Cellular Systems in a Composite Fading Channel
Spectral Efficiency of Distributed MIMO Cellular Systems in a Composite Fading Channel
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DOI：
10.1109/icc.2008.245
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
Dongming Wang;X. You;Jiangzhou Wang;Yan Wang;Xiao-yun Hou
中科院分区：
文献类型：
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作者：
Dongming Wang;X. You;Jiangzhou Wang;Yan Wang;Xiao-yun Hou
在本文中，精确的近似频谱效率的共址多输入多输出（C-MIMO）和分布式MIMO（D-MIMO）蜂窝系统的复合信道模型，其中包括路径损耗，阴影衰落和多径衰落。首先，以期望用户位置为条件，推导了高信噪比下C-MIMO和D-MIMO系统互信息均值和方差的解析近似表达式。由于在瑞利-对数正态复合环境中互信息的精确分布很难分析，我们采用高斯近似的互信息的分布。然后，遍历容量和中断容量的D-MIMO信道的天线的数量以及阴影衰落的方差的增长是很好地理解。假设用户在小区中随机分布，推导了平均频谱效率和平均中断频谱效率的封闭表达式。最后给出了数值计算结果，验证了分析结果的正确性.
In this paper, accurate approximations of the spectral efficiency are presented for co-located multiple-input multiple-output (C-MIMO) and distributed MIMO (D-MIMO) cellular systems in the composite channel model, which includes path loss, shadow fading, and multipath fading. Firstly, conditioned on the desired user position, the analytical approximations of the mean and variance of the mutual information are derived for C-MIMO and D-MIMO at high SNR. Because the exact distribution of the mutual information in a composite Rayleigh- lognormal environment is difficult to analyze, we apply Gaussian approximation to the distribution of the mutual information. Then, the growth in ergodic capacity and outage capacity of a D-MIMO channel with the number of antennas as well as the variance of the shadow fading is well understood. Assuming that the users are randomly distributed in the cell, the closed-form expressions for the mean spectral efficiency and mean outage spectral efficiency are derived. Finally, the numerical results are presented which validate the analytical results.