Capacity scaling in MIMO wireless systems under correlated fading
Capacity scaling in MIMO wireless systems under correlated fading
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DOI：
10.1109/18.985982
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发表时间：
2002-03-01
影响因子：
2.5
通讯作者：
Valenzuela, RA
中科院分区：
文献类型：
--
作者：
Chuah, CN;Tse, DNC;Valenzuela, RA
以前的研究表明，在发射机和接收机采用n元天线阵列的单用户系统可以实现与n成比例的容量，假设天线对之间的独立瑞利衰落。本文通过理论分析和射线跟踪仿真研究了相关衰落下双天线系统的容量。我们推导和比较表达式的渐近增长率的容量与n个天线的独立和相关的衰落的情况下，后者是根据一些假设的衰落相关结构的缩放。在这两种情况下，理论容量增长在n中是线性的，但在存在相关衰落的情况下，增长率小10-20%。我们分析我们的假设，可分离的发送/接收相关性通过模拟的基础上的射线跟踪传播模型。结果表明，经验容量收敛到极限容量从我们的渐近理论预测，即使在温和的n = 16。我们目前的情况下，当发射机不知道信道实现的结果。
Previous studies have shown that single-user systems employing n-element antenna arrays at both the transmitter and the receiver can achieve a capacity proportional to n, assuming independent Rayleigh fading between antenna pairs. In this paper, we explore the capacity of dual-antenna-array systems under correlated fading via theoretical analysis and ray-tracing simulations. We derive and compare expressions for the asymptotic growth rate of capacity with n antennas for both independent and correlated fading cases; the latter is derived under some assumptions about the scaling of the fading correlation structure. In both cases, the theoretic capacity growth is linear in n but the growth rate is 10-20% smaller in the presence of correlated fading. We analyze our assumption of separable transmit/receive correlations via simulations based on a ray-tracing propagation model. Results show that empirical capacities converge to the limit capacity predicted from our asymptotic theory even at moderate n = 16. We present results for both the cases when the transmitter does and does not know the channel realization.