计算机科学 ›› 2019, Vol. 46 ›› Issue (8): 152-156.doi: 10.11896/j.issn.1002-137X.2019.08.025

• 网络与通信 • 上一篇    下一篇

基于延迟CSIT的非对称双向中继X信道传输方案

刘锋, 葛培新, 曾连荪   

  1. (上海海事大学信息工程学院 上海201306)
  • 收稿日期:2018-07-20 出版日期:2019-08-15 发布日期:2019-08-15
  • 通讯作者: 刘锋(1976-),男,博士,讲师,主要研究方向为MIMO无线通信,E-mail:267475602@qq.com
  • 作者简介:葛培新(1995-),男,硕士生,主要研究方向为MIMO无线通信;曾连荪(1968-),男,博士,教授,主要研究方向为定位导航系统
  • 基金资助:
    国家自然科学基金项目(61271283),上海教委科研创新项目(14YZ113)

Transmission Scheme for Asymmetric Two-way Relay X Channel Based on Delayed CSIT

LIU Feng, GE Pei-xin, ZENG Lian-sun   

  1. (College of Information Engineering,Shanghai Maritime University,Shanghai 201306,China)
  • Received:2018-07-20 Online:2019-08-15 Published:2019-08-15

摘要: 在快速衰落信道中,当发送端不具备即时的信道状态信息(CSIT)时,利用延迟信道状态信息能够提高系统的自由度。假设系统每个节点具有延迟CSIT,研究了非对称(即中继两侧用户数不相等)双向中继X信道的自由度。将传输过程分为MAC和BC两个阶段,提出了一种结合干扰对齐与物理层网络编码的多级传输方案,利用延迟CSIT在多个时隙解码期望消息。实验结果表明,本方案可以实现比Vaze提出的上界高21.8%的复用增益,同时,相对于TDMA方案提升了166.7%。分析结果表明,相对于TDMA方案和Vaze界,该方案能够实现一定程度的自由度增益。

关键词: 多级传输, 延迟CSIT, 中继, 自由度

Abstract: In the fast fading channel,when instantaneous channel state information at transmitter (CSIT) is unavailable,the delayed channel state information can be used to improve the degree of freedom (DoF) of the system.Assuming that each node of the system has a delayed CSIT,the DoF of asymmetrical (with unequal number of users on the both sides of the relay) bidirectional relayed X-channels was investigated in this paper.The transmission procedure was divided into two phases,including multiple access channel (MAC) and broadcast channel (BC).A multi-stage transmission scheme combining interference alignment and physical layer network coding was proposed,which uses the delayed CSIT to decode the desired messages in multiple time slots.The experimental result shows that the proposed scheme can achieve a multiplexing gain of 21.8%,which is higher than the upper bound proposed by Vaze,and get an increase of 166.7% compared with the TDMA scheme.The analysis result shows that the proposed scheme can achieve some DoF gain compared with the TDMA scheme and Vaze bound

Key words: Degree of freedom, Delayed CSIT, Multiple-stage transmission, Relay

中图分类号: 

  • TN929.5
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