认知无线电系统QoS约束下的最优功率分配

S. Vassaki, M. Poulakis, A. Panagopoulos, P. Constantinou
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引用次数: 12

摘要

认知无线电技术旨在有效利用有限的无线电资源,提高无线网络频谱使用的灵活性。该技术的主要思想是发展智能网络,在智能网络中,未经许可的次要用户可以与已许可的主要用户共存,并始终受到不影响其通信的义务的限制。本文研究了一种在衰落环境下工作的频谱底层认知无线电系统。在保证满足主用户平均干扰限制约束的前提下,提出了一种服务质量驱动的功率分配方案,以最大限度地提高辅助用户的有效容量。该方案考虑了主用户对辅助用户的干扰,使优化分配更加现实。最后,通过数值模拟对所提出的分配方案进行了评价,验证了理论分析的正确性。
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Optimal power allocation under QoS constraints in cognitive radio systems
Cognitive radio technology aims at the efficient utilization of the limited radio resources and the improvement of flexibility of spectrum usage in wireless networks. The main idea of this technology is the development of intelligent networks where the unlicensed secondary users may coexist with the licensed primary users, always limited by the obligation not to affect their communication. In this paper, we consider a spectrum underlay cognitive radio system operating in fading environment. Guaranteeing that the average interference limit constraint to primary users is satisfied, we propose a quality of service (QoS)-driven power allocation scheme, with a view to maximizing the effective capacity of the secondary users. The proposed scheme takes into consideration the interference of primary user to the secondary user, in order to accomplish the optimal allocation more realistically. Finally, the proposed allocation scheme has been evaluated through numerical simulations that confirm the presented theoretical analysis.
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