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Exploiting cooperative multipath-Doppler diversity in relay-assisted high-speed train communications
  • 时间:0
  • 分类:TN914[电子电信—通信与信息系统;电子电信—信息与通信工程] U292.914[交通运输工程—交通运输规划与管理;交通运输工程—道路与铁道工程]
  • 作者机构:[1]Department of Information Science and Electronic Engineering,Zhejiang University, Hangzhou 310027, China
  • 相关基金:Acknowledgments This work was supported in part by the National Key Basic Research Program of China (2012CB316104), National Hi-Tech R&D Program (2014AA01AT02), Zhejiang Provincial Nat- ural Science Foundation of China (LR12F01002), and the National Natural Science Foundation of China (61371094).
中文摘要:

Severe doubly selective channel fading,or the time- and frequency-selective fading,prevailing in highspeed train(HST) communications,has been a critical issue that hinders the improvement of system efficiency and reliability.In this paper,a relay-assisted HST communication system is considered,and a low-complexity but effective scheme is proposed to cooperatively exploit the joint multipath–Doppler diversity of both the direct link and the relay link and thus to mitigate the negative effect of channel fading and improve the system reliability.In particular,using a special precoding structure followed by two-dimensional Fourier transform,the transmit signal is generated which in effect parallelizes the doubly selective fading channel.As a result,in the transform domain,pointwise combining and equalization,which are of linear complexity,become feasible and diversity gain is obtained.The maximal diversity order is then analyzed under the amplify-and-forward relay settings,which reveals that by cooperative relaying the joint multipath–Doppler diversity of both links can be well exploited.Simulation results verified our analysis.

英文摘要:

Severe doubly selective channel fading, or the time- and frequency-selective fading, prevailing in high- speed train (HST) communications, has been a critical issue that hinders the improvement of system efficiency and reli- ability. In this paper, a relay-assisted HST communication system is considered, and a low-complexity but effective scheme is proposed to cooperatively exploit the joint mul- tipath-Doppler diversity of both the direct link and the relay link and thus to mitigate the negative effect of channel fading and improve the system reliability. In particular, using a special precoding structure followed by two-dimensional Fourier transform, the transmit signal is generated which in effect parallelizes the doubly selective fading channel. As a result, in the transform domain, pointwise combining and equalization, which are of linear complexity, become feasi- ble and diversity gain is obtained. The maximal diversity order is then analyzed under the amplify-and-forward relay settings, which reveals that by cooperative relaying the joint multipath-Doppler diversity of both links can be well exploited. Simulation results verified our analysis.

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