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In-band pilot and cyclic prefix (CP)-based sensing, exploiting OFDM signal characteristics in the frequency domain and time domain respectively, are two effective techniques for low SNR spectrum sensing in cognitive radio communications. This paper seeks the theoretical performance improvement and optimal solution on the combination of these two techniques. The principles and performances of these...
To ensure proper operations of primary users and a fair spectrum sharing among the secondary users, spectrum sensing and user identification at cognitive radio (CR) have to be achieved with high accuracy under low signal- to-noise ratio (SNR). Motivated by the unavailability of perfect synchronization and prior noise knowledge at the CR sensing device, a robust sensing and user identification technique...
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