IEEE Transactions on Wireless Communications · 2008 · 347 citations · 17 references
EngineeringCommunicationElectrical EngineeringAntennasInformation TheoryWireless CommunicationsCoding TheoryCognitive RadioCooperative CommunicationDiversity TechniquesMultiple Access TechniquesSpectrum ManagementCognitive Radio NetworksCooperative Spectrum SensingFrequency-selective FadingRayleigh FadingShadowingSpace-time CodingSpectrum SensingTransmit Diversity
Cooperative spectrum sensing in cognitive radio networks over Rayleigh fading channels is investigated. The study analyzes cooperative spectrum sensing performance accounting for reporting errors and proposes transmit and relay diversity techniques to mitigate these limitations. The authors model multiple cognitive radios as a virtual antenna array, applying space‑time coding for flat‑fading and space‑frequency coding for frequency‑selective fading, and introduce relay diversity to enhance detection under heavy shadowing. Analytical results reveal that reporting errors limit detection performance, but relay diversity combined with algebraic coding further improves cooperative spectrum sensing.
In the letter the problem of cooperative spectrum sensing is investigated in cognitive radio (CR) networks over Rayleigh fading channels. By taking into account the error effect on the decision reporting, a general performance analysis of cooperative spectrum sensing is given. The analytical detection results show that the performance of cooperative spectrum sensing is limited by the probability of reporting errors. To deal with this limitation, we propose a transmit diversity based cooperative spectrum sensing method. By regarding multiple CRs as a virtual antenna array, space-time coding and spacefrequency coding are applied into CR networks over flat-fading and frequency-selective fading channels, respectively. Moreover, we propose a relay diversity based cooperative spectrum sensing approach to increase the diversity of detection when some CRs are in heavy shadowing. It is then shown that, when combined with algebraic coding, relay diversity can further improve the cooperative spectrum sensing performance.
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Energy detection of unknown deterministic signals
H. Urkowitz · Proceedings of the IEEE · 1967 · 3.2K citations