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次用户(SU)系统是认知无线电中的核心概念,SU在满足主用户(PU)干扰约束的前提下接入授权频谱,能够显著提高无线频谱的整体使用效率。基于分布式天线的SU系统(DABSS)以其巨大的容量优势,正成为当前的研究热点。DABSS中分布式天线的位置能极大地影响SU系统的容量。为了提高SU系统的容量,该文提出了距离平方功率比(squared distance divided power,SDDP)准则来进行天线位置的设计。特别考虑一种采用圆阵天线配置的DABSS,给出了天线位置的解析表达式。仿真结果表明:该方案与最优的天线放置方案性能接近,能够在满足PU干扰约束的前提下大幅提升SU系统的容量。
The SU system is the core concept of cognitive radio. The SU accesses the licensed spectrum under the interference constraint of the primary user (PU), which can significantly improve the overall usage efficiency of the wireless spectrum. Based on the distributed antenna SU system (DABSS) with its huge capacity advantage, is becoming the current research focus. The location of the distributed antenna in DABSS can greatly affect the capacity of the SU system. In order to improve the capacity of SU system, this paper proposes the design of antenna position based on the squared distance divided power (SDDP) criterion. In particular, consider a DABSS configuration using a circular array antenna, given an analytical expression of the antenna position. The simulation results show that this scheme is close to the optimal antenna placement scheme and can greatly improve the capacity of the SU system under the premise of meeting the PU interference constraints.