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首页> 外文会议>Military Communications Conference, 2009. MILCOM 2009 >Detection-interference dilemma for spectrum sensing in cognitive radio systems
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Detection-interference dilemma for spectrum sensing in cognitive radio systems

机译：认知无线电系统中频谱感知的检测干扰困境

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摘要

Cognitive radio technique is proposed as a means of improving the efficiency of current spectrum allocation policy by allowing the unlicensed secondary users (SU) to access the unused spectrum resources (white band) of the licensed primary users (PU). This technique largely relies on the secondary users' capability to detect the unused spectrum band, thus avoiding interference to the primary users. Instead of viewing the spectrum sensing as merely a detection process, in this paper, we analyze the spectrum sensing strategies from the communication perspective, with system capacity and interference as two major system performance metrics. As a result, we then discover the dilemma between PU presence detection and the interference from the SU to the PU caused by the reciprocality of the wireless channel in large-scale fading sense. To solve this dilemma, we propose a new performance criterion called utility loss function to set the threshold in spectrum sensing. Additionally, the cooperation among spectrum sensing users is shown to effectively solve the dilemma.
机译：提出了认知无线电技术作为通过允许未许可的次要用户（SU）访问许可的主要用户（PU）的未使用频谱资源（白带）来提高当前频谱分配策略效率的手段。该技术在很大程度上依赖于次要用户检测未使用频谱带的能力，从而避免了对主要用户的干扰。在本文中，我们不仅将频谱感知视为检测过程，还从通信角度分析了频谱感知策略，并将系统容量和干扰作为两个主要系统性能指标。结果，我们然后发现了在无线衰落意义上，PU存在检测与无线信道互易性引起的SU对PU的干扰之间的两难境地。为了解决这个难题，我们提出了一种新的性能标准，称为效用损失函数，以设置频谱感测的阈值。此外，显示了频谱感测用户之间的合作可以有效解决难题。

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