一种卫星固定业务上行频段无授权接入方案

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

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.

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 channels are 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