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Exploitation of MIMO techniques for reliable HF communication

机译:利用MIMO技术实现可靠的HF通信

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HF Communication has been synonymous with long ranges achievable using relatively inexpensive equipment. The downside though, has been the highly unreliable nature of the HF Ionospheric channel, which has deterred the development of systems capable of exploiting the large ranges achievable using sky wave/ionospheric propagation. The ionospheric channel is characterized by extensive multipath fading which is a substantial impediment for HF communication systems. MIMO (Multi Input Multi Output) systems on the other hand, exploit multipath to substantially improve communication efficacy and have been successfully employed in Wi-fi, cellular and VHF range applications. This paper studies the feasibility of exploiting MIMO techniques to exploit the Multipath effects prevalent in HF Ionospheric channel so as to improve the BER efficiency of data communication over HF links. Simulations for HF communication system using multiple transmit and/or receive antennas show substantial improvement in performance (Eb/No v/s BER) vis-à-vis the case of single transmitter and receiver. It is shown that diversity gain achieved compares to the maximum gain possible as in the case of MIMO over VHF and Wi-Fi applications.
机译:HF通信已成为使用相对便宜的设备可实现的远距离的代名词。不利的一面是HF电离层通道的高度不可靠特性,这阻碍了能够利用天波/电离层传播实现的大范围探测能力的系统的开发。电离层信道的特点是广泛的多径衰落,这对HF通信系统是一个很大的障碍。另一方面,MIMO(多输入多输出)系统利用多路径来显着提高通信效率,并已成功应用于Wi-fi,蜂窝和VHF范围应用中。本文研究了利用MIMO技术来开发HF电离层信道中普遍存在的多径效应的可行性,以提高HF链路上数据通信的BER效率。使用多个发射和/或接收天线的HF通信系统的仿真显示,与单个发射器和接收器相比,性能(Eb / No v / s BER)有了显着提高。结果表明,与在VHF和Wi-Fi应用上的MIMO情况一样,实现的分集增益与可能的最大增益相比。

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