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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...
Recent development in cognitive radio (CR) communications brings significant technical challenges in the design of adaptive and robust transmission techniques in hostile communication environments due to the dynamic channel transitions and strong co-channel interference. A novel adaptive Orthogonal Frequency Division Multiplexing (OFDM) system with a precoded cyclic prefix (PCP) is proposed in this...
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...
Due to the widespread deployment of OFDM and recent advent of cognitive radio communications, robust and simple spectrum sensing techniques for OFDM signals receive significant research interest. In this paper, a time domain pilot correlation (TDPC) technique, which overcomes the complexity of FFT-based pilot sensing methods, is proposed. The TDPC technique provides an efficient and simple spectrum...
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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