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一种不等差错保护的多用户随机接入方法

孙景云 刘荣科 胡应梦

孙景云, 刘荣科, 胡应梦等 . 一种不等差错保护的多用户随机接入方法[J]. 北京航空航天大学学报, 2017, 43(12): 2449-2456. doi: 10.13700/j.bh.1001-5965.2016.0938
引用本文: 孙景云, 刘荣科, 胡应梦等 . 一种不等差错保护的多用户随机接入方法[J]. 北京航空航天大学学报, 2017, 43(12): 2449-2456. doi: 10.13700/j.bh.1001-5965.2016.0938
SUN Jingyun, LIU Rongke, HU Yingmenget al. A random multi-user access method with unequal protection[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(12): 2449-2456. doi: 10.13700/j.bh.1001-5965.2016.0938(in Chinese)
Citation: SUN Jingyun, LIU Rongke, HU Yingmenget al. A random multi-user access method with unequal protection[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(12): 2449-2456. doi: 10.13700/j.bh.1001-5965.2016.0938(in Chinese)

一种不等差错保护的多用户随机接入方法

doi: 10.13700/j.bh.1001-5965.2016.0938
基金项目: 

国家“863”计划 2015AA7014065

详细信息
    作者简介:

    孙景云 女, 博士研究生。主要研究方向:多址接入技术、空天信息网络

    刘荣科 男, 博士, 教授。主要研究方向:空天信息网络、多媒体通信与计算、专用集成电路设计

    胡应梦 男, 博士研究生。主要研究方向:自适应传输技术

    通讯作者:

    刘荣科, E-mail: rongke_liu@buaa.edu.cn

  • 中图分类号: TN927.23

A random multi-user access method with unequal protection

Funds: 

National High-tech Research and Development Program of China 2015AA7014065

More Information
  • 摘要:

    针对在随机接入中由于碰撞导致吞吐率低、信道拥塞时不能满足高优先级数据有效传输的问题,提出一种具有不等差错保护性能的多用户随机接入方法。该方法将数据包复制多份,根据选定的度分布在不同时隙中传输,将随机接入过程映射到二分图上;接收端利用连续干扰消除(SIC)技术,将碰撞的数据包恢复出来。在高链路负载下,从每帧中选取若干时隙,只允许高优先级用户接入,以提高对高优先级数据包的译码概率。使用“与或树”理论对提出的方法进行了理论分析,并进行了实验仿真验证。仿真结果表明:提出的多用户随机接入方法与传统ALOHA协议相比,在低链路负载下有效避免由于碰撞引起的吞吐率下降;与IRSA协议相比,高链路负载下有效提高高优先级用户的吞吐率。

     

  • 图 1  多用户接入系统模型

    Figure 1.  System model of multi-user access

    图 2  多用户随机接入与连续干扰消除过程

    Figure 2.  Random multi-user access and successive interference cancellation process

    图 3  自适应调整过程

    Figure 3.  Adaptive adjustment procedure

    图 4  G=0.938时链路负载估计概率分布

    Figure 4.  Traffic load estimation density at G=0.938

    图 5  不同优先级用户丢包率性能对比

    Figure 5.  Comparison of packet loss probability performance of users with different priorities

    图 6  不同优先级用户吞吐率性能对比

    Figure 6.  Comparison of throughput performance of users with different priorities

    表  1  链路负载估计均值和方差

    Table  1.   Traffic load estimate mean and variance

    负载 均值 均方差
    0.2 0.200 0.007
    0.4 0.400 0.013
    0.6 0.601 0.017
    0.8 0.799 0.025
    1.0 1.006 0.038
    1.2 1.203 0.053
    1.4 1.408 0.080
    1.6 1.616 0.119
    1.8 1.824 1.954
    2.0 0.140 0.165
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-12-13
  • 录用日期:  2017-06-16
  • 网络出版日期:  2017-12-20

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