Study on Cognitive Opportunistic Relaying with the Interference from Primary User over Nakagami-m Fading Channels
Study on Cognitive Opportunistic Relaying with the Interference from Primary User over Nakagami-m Fading Channels
复制标题
Nakagami-m衰落信道上主用户干扰的认知机会中继研究
DOI：
10.1007/s11277-016-3497-0
复制
发表时间：
2016
影响因子：
2.2
通讯作者：
Zhu Hongbo
中科院分区：
文献类型：
--
作者：
Wang Weisheng;Jia Xiangdong;Yang Longxiang;Zhu Hongbo
The outage performance of cognitive opportunistic relaying (COR) systems with the interference at secondary user (SU) from primary user (PU) is analyzed over Nakagami-m fading channels. Specially, we derive an exact closed-form expression for the outage probability of the interested COR systems under the joint impact of the maximum transmission power PM at SU and the maximum interference power Q at PU. Based on the derivations, the impact of system parameters on outage performance is investigated. We first investigate the outage probability versus Q under different fading severity factors. Results show that all curves of outage probability pass through a common crossing point (the corresponding value of Q be Q*) only when the all fading severity factors are equal. In this case, the outage probability is decreasing with the fading severity factors when Q > Q*, while it is increasing when Q < Q*. Furthermore, the formation of the crossing point only dependents on the fading severity factors, but not on other system parameters such as the average fading power and the number of relays. At the same time, we also investigate the impact of PM on outage performance by defining μ = Q/PM. It is achieved that the maximum transmit power constraint PM can be neglected with very little error of performance estimation when μ>1.5\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mu > 1.5$$\end{document}. This would result in the decrease of complexity in performance analysis and system design. Otherwise, the impact of the maximum transmit power constraint PM must be considered in order to avoid the estimation error.
The outage performance of cognitive opportunistic relaying (COR) systems with the interference at secondary user (SU) from primary user (PU) is analyzed over Nakagami-m fading channels. Specially, we derive an exact closed-form expression for the outage probability of the interested COR systems under the joint impact of the maximum transmission power PM at SU and the maximum interference power Q at PU. Based on the derivations, the impact of system parameters on outage performance is investigated. We first investigate the outage probability versus Q under different fading severity factors. Results show that all curves of outage probability pass through a common crossing point (the corresponding value of Q be Q*) only when the all fading severity factors are equal. In this case, the outage probability is decreasing with the fading severity factors when Q > Q*, while it is increasing when Q < Q*. Furthermore, the formation of the crossing point only dependents on the fading severity factors, but not on other system parameters such as the average fading power and the number of relays. At the same time, we also investigate the impact of PM on outage performance by defining μ = Q/PM. It is achieved that the maximum transmit power constraint PM can be neglected with very little error of performance estimation when μ>1.5\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mu > 1.5$$\end{document}. This would result in the decrease of complexity in performance analysis and system design. Otherwise, the impact of the maximum transmit power constraint PM must be considered in order to avoid the estimation error.