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一种卫星固定业务上行频段无授权接入方案

赵陆文1，周志杰1，缪志敏2   

  1. 1.解放军理工大学 通信工程学院，江苏 南京 210007;
    2.解放军理工大学 指挥自动化学院，江苏 南京 210007
  • 收稿日期:2007-10-26 修回日期:2008-01-09 出版日期:2008-05-31 发布日期:2008-05-31

An Unlicensed Access Scheme for Up-band of Fixed Satellite Service

ZHAO Lu-wen1，ZHOU Zhi-jie1，MIAO Zhi-min2
  

  1. 1.Institute of Communication Engineering, PLA University of Science and Technology, Nanjing 210007, China
    2.Institute of Command Automation, PLA University of Science and Technology, Nanjing 210007, China
  • Received:2007-10-26 Revised:2008-01-09 Online:2008-05-31 Published:2008-05-31

摘要： 为了提高卫星固定业务上行频段的频谱利用效率，提出了一种无授权接入该频段的方案。利用卫星的“空闲”信道构建认知无线电业务信道，同时采用宽带扩频信号，构建具有较低功率谱密度和较强抗干扰能力的公共协调信道。给出了Ad Hoc和星型两种基本的无授权接入模型，重点分析了认知无线电对卫星可能造成的干扰。理论分析和仿真结果表明，众多感知用户可以利用该方案，以低于1%的干扰概率避免对卫星接收机造成有害干扰，实现在卫星固定业务上行频段的无授权接入。

关键词:

认知无线电, 卫星固定业务, 无授权接入, 动态频率选择, 干扰温度

Abstract:

In order to improve the spectrum usage of the up-band of fixed satellite service (FSS), an unlicensed access scheme is presented. The satellite’s idle channel is used for cognitive radio service channel, and a common coordinate channel with lower transmitting power and better anti-jamming ability is proposed. The two basic unlicensed access modes, Ad hoc and star mode, are considered. According to interference temperature, the interference of the cognitive radios to satellite receiver is analyzed. Analysis and simulation results show that, by using this scheme to avoid interference to satellite receiver with the jam-probability lower than 1%, many cognitive radios can access the band without special authorization.

Key words:

cognitive radio, fixed satellite service, unlicensed access, dynamical frequency selection, interference temperature