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Spectrum sensing is an essential functionality that enables cognitive radios (CR) to detect spectral holes and to opportunistically use under-utilized frequency bands without causing harmful interference to primary users. In this paper, we study the fundamental tradeoff between sensing capability and achievable throughput of CR users. By assuming the reporting channel is a binary symmetric channel...
As for the limitation of traditional frequency, the concept of local frequency is proposed, which makes the physical meaning of frequency more clear. The wide adaptability of local frequency is also discussed. Moreover, a novel time-frequency analysis approach is presented based on local frequency and EMD. The time-frequency distributions of simulated signals are investigated by the new approach....
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