Effect of Doppler Shift on the MIMO-OFDM Systems in Troposcatter Fading Channels

International Conference on Network, Communication and Computing Pub Date : 2016-12-17 DOI:10.1145/3033288.3033315

Zedong Xie, Xihong Chen, Xiaopeng Liu

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引用次数: 1

Abstract

In troposcatter communication systems based on multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM), both channel estimation error and Doppler shift exist inherently. To investigate the Doppler shift effect, an improved time-varying multipath channel model is built. Zero-forcing (ZF) detection and approximation method of Wishart distribution are adopted to calculate the signal to interference plus noise ratio (SINR) of the system and its probability distribution. Then, SINR is used to analyze the average error rate in the presence of both channel estimation error and Doppler shift. The simulated results show that, in troposcatter fading channels, Doppler shift has little influence on the performance of the bite error rate (BER) in the presence of relatively small estimation error. However, with larger estimation error, a slight Doppler shift influences the system performance significantly, and a large Doppler shift has little effect on the system. Moreover, the BER performance is also investigated when low density parity check (LDPC) channel codes are used.

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对流层散射衰落信道中多普勒频移对MIMO-OFDM系统的影响

在基于多输入多输出正交频分复用(MIMO-OFDM)的对流层散射通信系统中，固有的信道估计误差和多普勒频移都存在。为了研究多普勒频移效应，建立了一种改进的时变多径信道模型。采用零强迫(Zero-forcing, ZF)检测和Wishart分布近似法计算系统的信噪比(SINR)及其概率分布。然后，利用信噪比分析信道估计误差和多普勒频移同时存在时的平均误差率。仿真结果表明，在对流层散射衰落信道中，在估计误差较小的情况下，多普勒频移对误码率(BER)性能的影响较小。但在估计误差较大的情况下，较小的多普勒频移对系统性能影响较大，较大的多普勒频移对系统影响不大。此外，还研究了使用低密度奇偶校验(LDPC)信道码时的误码率性能。

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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International Conference on Network, Communication and Computing

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