Measurement-Based Performance Evaluation of MIMO Spatial Multiplexing in a Multipath-Rich Indoor Environment
Measurement-Based Performance Evaluation of MIMO Spatial Multiplexing in a Multipath-Rich Indoor Environment
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DOI：
10.1109/tap.2007.910303
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发表时间：
2007-12
影响因子：
5.7
通讯作者：
Hiroshi Nishimoto;T. Ohgane
中科院分区：
文献类型：
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作者：
Hiroshi Nishimoto;T. Ohgane
多输入多输出（MIMO）空间复用技术需要在接收端对传输的信号流进行分离和检测，从而提高了在独立和同分布（i.i.d）信道上传输的数据速率。这种信道被认为存在于非视距（NLOS）环境中。然而，实际通信也可以在视距（LOS）环境中进行。虽然LOS组件可以增加接收的功率水平，但它也可能导致相关通道，从而难以检测传输的流。在本文中，我们描述了在室内环境下基于LOS和NLOS信道测量的4 × 4 MIMO空间复用性能。对于8种均匀线性阵列（4个天线间距和2个阵列方向），我们评估了信道容量和误码率性能随发射功率的累积分布函数（CDF），并从天线方向图、衰落相关性、MIMO信道单元的CDFs和特征值的CDFs方面进行了分析。结果表明，尽管有较高的衰落相关性和非信道特性，MIMO在LOS环境下的空间复用性能优于NLOS环境。然而，在测量的LOS环境中的性能很大程度上取决于MIMO配置。
Multiple-input multiple-output (MIMO) spatial multiplexing that needs to separate and detect transmitted signal streams by using processing at the receiver end can increase the data rates of transmissions on independent and identically distributed (i.i.d.) channels. Such channels have been considered to exist in nonline-of-sight (NLOS) environments. However, actual communications may also be conducted in line-of-sight (LOS) environments. While an LOS component can increase the received power level, it may also cause correlated channels that make it difficult to detect the transmitted streams. In this paper, we describe the performance of 4 times 4 MIMO spatial multiplexing based on LOS and NLOS channel measurements in an indoor environment. For eight configurations of uniform linear arrays (four antenna spacings and two array orientations), we evaluated the cumulative distribution function (CDF) of the channel capacity and bit error rate performance versus transmit power, and we analyzed them in terms of antenna pattern, fading correlation, CDFs of MIMO channel elements, and CDFs of eigenvalues. Results show that, despite higher fading correlations and non i.i.d. channel characteristics, the performance of MIMO spatial multiplexing in the LOS environment is better than that in the NLOS one. However, the performance in the measured LOS environment largely depends on the MIMO configuration.