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Reliable spectrum sensing in low signal-to-noise ratio (SNR) condition is one of the major technical challenges in cognitive radio network. In this paper, we propose a robust spectrum sensing algorithm for unsynchronized low SNR OFDM signal by mitigating the impacts of time and frequency offsets with multiple processing time window and sliding frequency correlator, respectively. In addition, considering...
Spectrum sensing is one of the fundamental enabling technologies for cognitive radio (CR) communications. Motivated by the infeasibility of using noise variance dependent signal sensing threshold for CR users, a robust spectrum sensing scheme using a proposed noise parameter cancelation (NPC) method for orthogonal frequency division multiplexing (OFDM) signals is investigated in this paper. Identification...
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