北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (12): 2449-2456.doi: 10.13700/j.bh.1001-5965.2016.0938

• 论文 • 上一篇    下一篇

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   

  1. 北京航空航天大学 电子信息工程学院, 北京 100083
  • 收稿日期:2016-12-13 修回日期:2017-06-16 出版日期:2017-12-20 发布日期:2017-09-18
  • 通讯作者: 刘荣科 E-mail:rongke_liu@buaa.edu.cn
  • 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。
  • 基金资助:
    国家“863”计划(2015AA7014065)

A random multi-user access method with unequal protection

SUN Jingyun, LIU Rongke, HU Yingmeng   

  1. School of Electronic Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2016-12-13 Revised:2017-06-16 Online:2017-12-20 Published:2017-09-18
  • Supported by:
    National High-tech Research and Development Program of China (2015 AA7014065)

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。

关键词: 随机接入, 不等差错保护, 时隙ALOHA, 连续干扰消除(SIC), IRSA

Abstract: The throughput performance degrades under high traffic loads when massive bursty users have access to the satellite. To solve this problem, a random multi-user access method with unequal protection was proposed. Several copies of a packet were created and sent during different time slots according to a selected degree distribution. The random access procedure could be described by a bipartite graph. By using successive interference cancellation (SIC), collided packets can be recovered instead of abandoned. In addition, a portion of time slots in each frame were selected exclusively for high-priority users to improve the decoding probability of high-priority data packet. An analysis using standard "and-or trees" theory was introduced. Further, the proposed method was verified with experimental simulations. The simulation results show that the proposed random multi-user access method, compared with traditional ALOHA protocol, effectively avoids the throughput degradation caused by impact under low traffic loads. Compared with IRSA protocol, it enhances high-priority users' throughput under high traffic loads.

Key words: random access, unequal protection, slotted ALOHA, successive interference cancellation (SIC), IRSA

中图分类号: 


版权所有 © 《北京航空航天大学学报》编辑部
通讯地址:北京市海淀区学院路37号 北京航空航天大学学报编辑部 邮编:100191 E-mail:jbuaa@buaa.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发