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高速铁路无线通信中基于正交空时码的格型正交重构算法

罗万团,方旭明,程梦   

  1. 1. 西南交通大学 信息编码与传输省重点实验室,四川 成都 610031;2. 广西民族大学 信息科学与工程学院,广西 南宁 530006
  • 出版日期:2014-07-25 发布日期:2014-07-15
  • 基金资助:
    国家重点基础研究发展计划(“973”计划)基金资助项目(2012CB316100);国家自然科学基金资助项目(61071108, 61032002);铁道部科技研究开发计划基金资助项目(2013X016-A)

Trellis orthogonal reconstruction algorithm based on orthogonal space-time block code for wireless communication system in high-speed railway

  • Online:2014-07-25 Published:2014-07-15

摘要: 分析了基于正交空时码的开环和闭环MIMO系统,并着重研究了高铁场景下速度对正交空时码的影响,高速移动导致的快时变信道将会破环正交空时码的正交结构,降低由此获得的分集增益,从而引起了误码率性能的降低。提出了格型正交重构算法,通过givens变换对正交空时码进行码内正交重构;算法在恢复码内正交性的同时,也改变了发射端波束成形方向。因此,在高速移动场景下,所提算法使发射端获得了波束成形的阵列增益以及与用户静止时相同的分集增益。从系统性能仿真中看出,所提算法提升了高铁场景下基于正交空时码MIMO系统的误码性能。

Abstract: A detailed analysis of open-loop (OL) and closed-loop (CL) multiple input multiple output (MIMO) scheme based on orthogonal space-time block code (OSTBC), and lays emphasis on how the velocity influences the OSTBC in high-speed railway scenario is provided. When the train moves at a fantastic speed, the fast time-varying channel destroys the orthogonality of OSTBC reducing the diversity gain which would severely degrade the bit error rate (BER) performance. The trellis orthogonal reconstruction algorithm (TORA), in which the intra-code orthogonality is reconstructed through givens transformation and the transmit beamforming direction can be changed as well is proposed. In high-speed railway scenario, this proposal obtains not only the array gain by transmit beamforming, but also the same diversity gain as the train is motionless. The simulation shows that the TORA improves BER performance of MIMO schemes based on OSTBC for mobile communication system in high-speed railway.

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