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Analysis of Aggregate Interference and Primary System Performance in Finite Area Cognitive Radio Networks

机译：有限区域认知无线电网络中的总干扰和主系统性能分析

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摘要

This paper considers the analytical performance of primary users (PUs) subject to interference due to secondary users (SU) in an underlay cognitive radio system over Rayleigh fading. In particular, we focus on a more general spatial configuration where the interfered PU, not only located at the center of the cell, is having a protective region which is free of SUs and the SUs are distributed over a {finite area} in contrast to the commonly used infinite area assumption. We first characterize the statistical properties of the aggregate interference at the PU due to SUs, by deriving new exact closed form expressions for the moment generating function, cumulants, first, second and third moments and first order expansions of the cumulative distribution functions corresponding to propagation scenarios with path loss factors, two and four. We then investigate the PU performance by presenting new analytical expressions for the outage probability, amount of fading as well as the diversity order and coding gain. Our results indicate that the PU can achieve the full diversity gain given a non-zero protective region around the PU.
机译：本文考虑了在瑞利衰落基础上的认知无线电系统中，主要用户（PU）的分析性能受到次要用户（SU）干扰的影响。特别地，我们关注于更一般的空间配置，其中受干扰的PU不仅位于小区的中心，还具有一个不含SU的保护区域，并且SU分布在{有限区域}上，与常用的无限区域假设。我们首先通过推导矩生成函数，累积量，一阶，二阶和三阶矩以及累积分布函数对应于传播的一阶展开的新的精确封闭形式表达式，来表征由于SU引起的PU处总干扰的统计特性。具有路径损耗因子（两个和四个）的方案。然后，我们通过提供中断概率，衰落量以及分集阶数和编码增益的新解析表达式来研究PU性能。我们的结果表明，给定PU周围非零保护区域，PU可以实现全部分集增益。

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