认知中继网络中认知用户基于频谱感知机会中继的中断性能分析

摘要

认知无线电中继网络中,认知用户需要成功感知到其所在簇内的主用户频谱空穴后才能成为认知中继节点,且各认知中继节点发射功率受到各自主用户干扰温度限制( ITC).该文对认知中继节点采用分布式空时编码和解码转发协议时认知用户的中断性能进行了分析；给出了认知用户在干扰温度限制下中断概率的上下界,得出中断概率的上下界在不同干扰温度限下与认知用户归一化数据速率、中继数量和其对主用户检测概率的关系.给出了源节点和频谱感知中继节点在相同干扰温度限下的数值仿真,并对仿真结果进行了分析.%A cognitive user could be a cognitive relay node if it senses the primary user's spectrum successfully in a cognitive radio relay networks. The cognitive relay's transmit power is constrained by the interference temperature constraint (ITC) of its primary user. This paper analyzes the cognitive user's outage performance with many cognitive relays under different ITCs. We assume that those cognitive relays are distributed space-time coded and exploited decoded-forward protocol. The cognitive user's upper and lower outage probability bounds are given. The bounds versus its normal transmission rate, the cognitive relays' number and detection probability of primary users are discussed. The numerical simulations under same ITC are given, and the results are also analyzed.