Performance Comparison of Space-Time Coded MIMO-OFDM Systems Using Different Wideband MIMO Channel Models

2007 4th International Symposium on Wireless Communication Systems Pub Date : 2007-12-04 DOI:10.1109/ISWCS.2007.4392443

Yuanyuan Ma, M. Pätzold

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引用次数: 10

Abstract

This paper investigates the performance of multiple- input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems using different wideband MIMO channel models. The considered MIMO channel models are based on the geometrical elliptical model and the geometrical one-ring model. The spatial correlation effects due to the limited antenna spacings and the Doppler effect caused by the movement of the receiver are studied separately. It is shown that increasing the antenna spacings leads to a higher diversity gain. The relevant range of the antenna spacings that has a strong influence on the system performance is obtained through simulations. When the antenna spacings exceed the determined range, then the diversity gain does not increase significantly. Moreover, to achieve the same system performance, the MIMO-OFDM system employing the one-ring model requires larger antenna spacings than using the elliptical channel model. Furthermore, the influence of the maximum Doppler frequency has been studied under perfect and imperfect channel state information (CSI). It is demonstrated that system performance degradations occur if the maximum Doppler frequency increases, especially in case of imperfect CSI.

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采用不同宽带MIMO信道模型的空时编码MIMO- ofdm系统性能比较

本文研究了采用不同宽带MIMO信道模型的多输入多输出正交频分复用(MIMO- ofdm)系统的性能。所考虑的MIMO信道模型是基于几何椭圆模型和几何单环模型。分别研究了天线间距有限引起的空间相关效应和接收机运动引起的多普勒效应。结果表明，增大天线间距可获得更高的分集增益。通过仿真得到了对系统性能影响较大的天线间距的相关范围。当天线间距超过确定范围时，分集增益不会显著增加。此外，为了达到相同的系统性能，采用单环模型的MIMO-OFDM系统需要比使用椭圆信道模型更大的天线间距。此外，还研究了在完全信道状态信息和不完全信道状态信息下，最大多普勒频率的影响。结果表明，当最大多普勒频率增加时，系统性能会下降，特别是在不完全CSI的情况下。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2007 4th International Symposium on Wireless Communication Systems

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