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In the orthogonal frequency division multiplexing (OFDM)-based cognitive radio (CR) systems, adaptive resource allocation should consider the out-of-band interference. In this paper, allocation schemes with different optimization targets and multiple practical constraints are studied. Nonlinear equations for the optimal allocation are deduced. Two suboptimal methods based on bit removal procedure...
Spectrum detection for vacant bands is one of the key techniques in cognitive radio (CR) systems. Cooperative detection outperforms single user detection in many aspects. The existence of malicious user could severely degrade the performance of cooperative CR systems. In this paper, a new cooperative detection scheme with malicious user suppression is proposed, which has lower complexity and better...
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