An Efficient Power Control Scheme for Cognitive Radios
An Efficient Power Control Scheme for Cognitive Radios
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DOI：
10.1109/wcnc.2007.476
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发表时间：
2007-03
期刊：
影响因子：
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通讯作者：
Hong-Sam T. Le;Q. Liang
中科院分区：
文献类型：
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作者：
Hong-Sam T. Le;Q. Liang
在本文中，我们设计了一种使用模糊逻辑系统的发射功率控制系统，为认知无线电提供与主(许可)用户在同一频段共存的能力。通过我们内置的模糊功率控制器，认知无线电能够根据对主用户的干扰水平(PU)、到PU的距离以及其在基站(BS)的接收功率差的变化来机会性地调整其发射功率，同时满足对PU的足够低的干扰的要求。我们通过使用从一组网络专家而不是单一专家那里获得的发射功率控制(TPC)的语言知识来提高功率控制方案的可靠性。仿真结果表明，与固定步长功率控制方案相比，本文提出的模糊功率控制方案可以降低平均发射功率消耗，降低平均中断概率。
In this paper, we design a transmit power control system using fuzzy logic system to provide cognitive radios the ability to coexist with primary (licensed) users in the same frequency band. With our built-in fuzzy power controller, a cognitive radio is able to opportunistically adjust its transmit power in response to the changes of the interference level to primary user (PU), the distance to PU and its received power difference at the base station (BS) while satisfying the requirement of sufficiently low interference to PU. We increase the reliability of our power control scheme by using linguistic knowledge of transmit power control (TPC) obtained from a group of network experts rather than a single expert. Simulation results show that using our proposed fuzzy power control scheme, we can decrease average transmit power consumption and achieve lower average outage probability compared with the fixed-step power control scheme.