Energy Detection Spectrum Sensing Under RF Imperfections
作者： Alexandros-Apostolos A. Boulogeorgos , Nestor D. Chatzidiamantis , George K. Karagiannidis
DOI: 10.1109/TCOMM.2016.2561294
关键词: Communication channel 、 Radio frequency 、 Amplifier 、 Electronic engineering 、 Rayleigh fading 、 Energy (signal processing) 、 Electrical engineering 、 Phase noise 、 False alarm 、 Engineering 、 Cognitive radio
摘要: Direct-conversion radio (DCR) receivers can offer highly integrated low-cost hardware solutions for spectrum sensing in cognitive (CR) systems. However, the DCR are susceptible to frequency (RF) impairments, such as in-phase and quadrature-phase imbalance, low-noise amplifier nonlinearities, phase noise, which limit capabilities. In this paper, we investigate joint effects of RF impairments on energy detection-based CR systems multi-channel environments. particular, provide novel closed-form expressions evaluation detection false alarm probabilities, assuming Rayleigh fading. Furthermore, extend analysis case networks with cooperative sensing, where secondary users suffer from different levels imperfections, considering both scenarios error free imperfect reporting channel. Numerical simulation results demonstrate accuracy well detrimental imperfections performance, bring significant losses utilization.
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