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Outage Performance of cognitive AF relay networks with Imperfect CSI Based on Geometrical Analysis

Chinese Journal of Electronics 2017年第5期26卷 1048-1056页

作者： LIU Shuai SUN Dechun LIU Zujun YI Kechu YANG Hong WANG Kan State Key Laboratory of Integrated Services networks Xidian University China Academy of Space Technology

This paper studies the outage performance of a cognitive Amplify-and-forward(AF) relay network subject to Rayleigh *** the condition of imperfect Channel state information(CSI) estimations of the links from the secondary system to the Primary user(PU),the closed-form upper and lower bounds of the outage probability are derived through a geometrical analysis *** asymptotic analysis of the outage probability is also derived in the high Signal-to-noise ratio(SNR)regime to gain additional insights on the *** simulation results corroborate our theoretical analysis,and the effectiveness of the geometrical analysis method is verified with the conventional approach as a *** asymptotic results are very tight with the analytical lower bound in the high SNR *** also can be observed from the simulation results that the impact of the number of relays as well as the imperfect CSI on the outage probability and the diversity order.

关键词： cognitive relay networks Imperfect Channel state information(CSI) Geometrical analysis

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Cooperative relay Selection Mechanism in Multi-Hop networks

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Computers, Materials & Continua 2020年第4期63卷 119-130页

作者： Jian Liu Lei Wang Changming Zhao Alan Yang University of Science and Technology Beijing Beijing100083China School of Computer Science Chengdu University of Information TechnologyChengdu610225China College of Computer Science Sichuan UniversityChengdu610041China Amphenol Assemble Tech HoustonTX 77070USA

In this paper, we consider a three-hop relay system based on interference cancellation technique in Underlay cognitive radio (CR) network. Although underlay CR has been shown as a promising technique to better utilize the source of primary users (PUs), its secondary performance will be severely degraded. On one hand, by adapting the Underlay spectrum sharing pattern, secondary users (SUs) would observe the strict power constraints and be interfered by primary users. On the other hand, limited transmit power results in limited transmission range, which greatly degrade the secondary transmission capacity. To solve the problems above, we propose an interference cancellation protocol for multi-hop wireless communication networks in underlay CR, which could develop the long-distance transmission performance and improve the transmission efficiency significantly. As simulation results shows, proposed scheme significantly reduce the secondary outage probability and increase the secondary diversity than the traditional cases.

关键词： cognitive relay networks interference cancellation power control secondary outage probability

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