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高鐵基于毫米波的自適應(yīng)波束分合傳輸方案

閆莉,  方旭明

閆莉, 方旭明. 高鐵基于毫米波的自適應(yīng)波束分合傳輸方案[J]. 電子與信息學(xué)報, 2016, 38(1): 146-152. doi: 10.11999/JEIT150396
引用本文: 閆莉, 方旭明. 高鐵基于毫米波的自適應(yīng)波束分合傳輸方案[J]. 電子與信息學(xué)報, 2016, 38(1): 146-152. doi: 10.11999/JEIT150396
YAN Li, FANG Xuming. Adaptive Beam Splitting or Integrating Scheme for Railway Millimeter Wave Wireless Communications[J]. Journal of Electronics & Information Technology, 2016, 38(1): 146-152. doi: 10.11999/JEIT150396
Citation: YAN Li, FANG Xuming. Adaptive Beam Splitting or Integrating Scheme for Railway Millimeter Wave Wireless Communications[J]. Journal of Electronics & Information Technology, 2016, 38(1): 146-152. doi: 10.11999/JEIT150396

高鐵基于毫米波的自適應(yīng)波束分合傳輸方案

doi: 10.11999/JEIT150396
基金項目: 

國家973計劃(2012CB316100)，國家自然科學(xué)基金(61471303)，中國鐵路總公司科技研究開發(fā)計劃(Z2014-X002)

Adaptive Beam Splitting or Integrating Scheme for Railway Millimeter Wave Wireless Communications

Funds: 

The National 973 Program of China (2012CB 316100), The National Natural Science Foundation of China (61471303), The Program for Development of Science and Technology of China Railway Corporation (Z2014- X002)

  • 摘要: 向擁有較寬連續(xù)頻譜的高頻頻段擴展帶寬成為未來高鐵無線通信系統(tǒng)提升容量的有力手段，不過，需要采用大規(guī)模天線波束賦形技術(shù)克服高頻頻段路徑損耗嚴(yán)重的缺陷。在高鐵雙車載臺方案中，可以通過大規(guī)模天線陣列形成雙波束傳輸提高系統(tǒng)容量。在對其傳輸性能進(jìn)行分析后發(fā)現(xiàn)，雙波束傳輸優(yōu)化配置與列車的位置有關(guān)?；诖?，論文提出自適應(yīng)波束分合傳輸方案，當(dāng)列車距離基站較遠(yuǎn)時，為了避免波束間的嚴(yán)重干擾，雙波束合成為一個波束來覆蓋兩個接收端，實現(xiàn)接收分集，提高接收信號質(zhì)量；當(dāng)列車距離基站較近時，分裂成雙波束，實現(xiàn)空間復(fù)用，提高系統(tǒng)容量及傳輸可靠性。數(shù)值仿真結(jié)果表明，所提方案可以適應(yīng)列車運行位置，提升傳輸性能。
    Abstract: For future railway wireless communication networks, it is an effective way to adopt higher frequency spectra with broader bandwidth to enhance the transmission capacity. Nevertheless, massive beamforming techniques are needed to overcome the severe path loss of higher frequency spectra. For railway systems with dual on-vehicle receivers, dual-beam transmissions can be implemented to improve the capacity. The analysis results show that the optimization of dual-beam transmissions depends on the train position. Based on the above, an adaptive beam splitting or integrating communication scheme is proposed. When the train is far away from the base station, to avoid the inter-beam interference, an integrated beam with wider beamwidth is used to cover the two receivers to realize diversity receiving. As the train is approaching the center of the base station, two beams are generated to realize space multiplexing, to improve the transmission capacity and reliability. Numerical simulation results demonstrate that the proposed scheme can adapt to train positions and improve the transmission performance.
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出版歷程
  • 收稿日期:  2015-04-08
  • 修回日期:  2015-10-10
  • 刊出日期:  2016-01-19

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