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Likelihood-based spectrum sensing of OFDM signals in the presence of Tx/Rx I/Q imbalance

机译：在Tx / Rx I / Q不平衡的情况下对OFDM信号进行基于似然的频谱感知

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摘要

We consider the spectrum sensing problem in orthogonal frequency-division multiplexing-based cognitive radio networks under I/Q imbalance. We derive the likelihood ratio test in the presence of colored noise and I/Q imbalance at the analog front-ends of both of the primary and secondary users. Furthermore, we derive the probabilities of detection and false alarm and develop the receiver operating characteristics. We also examine the impacts of both transmit and receive I/Q imbalance on the performance of the likelihood ratio test. We compare the performance of our likelihood ratio test with that of the energy detector through extensive simulations and show the superiority of the former over a wide range of signal-to-noise ratios.
机译：我们考虑了I / Q不平衡下基于正交频分复用的认知无线电网络中的频谱感知问题。我们在主要用户和次要用户的模拟前端都存在有色噪声和I / Q不平衡的情况下得出似然比测试。此外，我们推导了检测和错误警报的可能性，并开发了接收机的工作特性。我们还检查了发送和接收I / Q不平衡对似然比测试性能的影响。通过广泛的仿真，我们将似然比测试的性能与能量检测器的性能进行了比较，并显示了前者在各种信噪比范围内的优越性。

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