Energy-Efficient Spectrum Sensing for Cognitive Radio Networks
Energy-Efficient Spectrum Sensing for Cognitive Radio Networks
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DOI：
10.1109/icc.2010.5502682
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
Hang Su;Xi Zhang
中科院分区：
文献类型：
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作者：
Hang Su;Xi Zhang
本文主要研究无线衰落信道下非时隙认知无线电网络中的频谱感知问题。针对认知无线电网络中现有的连续/固定调度频谱感知方案能量效率低的问题，提出了一种高效的二次用户频谱感知方案。我们提出的方案的设计目标是在保证PU的优先级和SU在可用频谱使用时间方面的频谱机会的同时，节省感知能量消耗。特别是，我们提出的能量高效的频谱感知方案通过利用PU的活动模式自适应地调整频谱感知周期并确定PU的存在和空闲。我们还提出了一种新的基于双阈值的序贯感知策略，在降低虚警概率的同时限制了漏检概率。为了验证和评估我们提出的方案，我们进行了仿真。
This paper focuses on the spectrum sensing issues in the unslotted cognitive radio networks with wireless fading channels. To overcome the energy-inefficiency problem of the existing continuous/fixed-schedule spectrum sensing schemes in the cognitive radio networks, we propose an efficient spectrum sensing scheme for secondary users (SUs). The design goal of our proposed scheme is to save the sensing energy consumption while guaranteeing the priority of the PUs and the spectrum opportunity for SUs in terms of available spectrum usage time. In particular, our proposed energy-efficient spectrum sensing scheme adaptively adjusts the spectrum sensing periods and determines between the presence and vacancy of the PU by taking advantage of PU's activity patterns. We also develop a novel two-threshold based sequential sensing policy to reduce the false alarm probability while limiting the missed detection probability. We conduct simulations to validate and evaluate our proposed scheme.