摘要： 在认知无线电网络中，次用户对主用户产生的干扰会影响主用户通信甚至产生通信中断。针对该问题，提出一种基于泊松分布的干扰模型。该模型考虑次用户对主用户基于信噪比的频谱感知概率，并在该模型的基础上针对不同的网络环境影响因素，如阴影和衰落，得到在不同环境下干扰模型的封闭表达式。利用干扰模型分析在不同环境影响因素下通信中断概率。仿真结果表明，该模型可以模拟真实环境中次用户对主用户的干扰，且通过分析得出不同的环境影响因素对通信中断概率的影响。

关键词: 认知无线电, 干扰, 次用户, 主用户, 泊松分布, 中断概率

Abstract: In cognitive radio networks, the interference caused by the secondary user may influence the communication of the primary user, even breaks off the communication. This paper introduces an interference model based on Poisson distribution, which considers the probability of spectrum-sensing based on the SNR. According to different network environment factors, like shadowing and multi-path fading, it gets the closed-form expression based on the interference model. The paper analyzes the interference outage probability based on the interference model. Simulation result shows that this interference model can reflect the interference in the real environment well and can be used to analyze the outage probability well. According to the result, different environment factors have double influence on the outage probability.

Key words: cognitive radio, interference, secondary user, primary user, Poisson distribution, outage probability

中图分类号: 

• TP391