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In this paper, we consider the Gaussian cognitive broadcast channel in which the primary user communicate to the primary receivers and the cognitive user has noncausal knowledge of the primary radio's codeword and wishes to communicate to two receivers. We characterize the largest rate region at which the cognitive user could reliably communicate under the constraints that no rate degradation is created...
For non-contiguous OFDM (NC-OFDM) based cognitive radio systems, one challenge is to establish the spectrum synchronization before the data transmission over an idle channel. In this paper, we propose two novel detection schemes, i.e., hard-decision-based detection (HDD) and soft-decision-based detection (SDD) schemes, to detect NC-OFDM symbols without the information of out-of-band spectrum synchronization...
For non-contiguous OFDM (NC-OFDM) based cognitive radio (CR) systems, one of huge challenges is to establish spectrum synchronization before data transmissions. In this paper, we propose a novel active subchannel detection scheme for the NC-OFDM receiver without out-of-band spectrum synchronization information. The key idea of the proposed scheme is to employ the received training symbol to calculate...
In this paper, we propose a novel strategy of filter design for filter bank multicarrier (FBMC) based cognitive radio (CR) systems, and the key idea is to directly optimize the filter coefficients with the objective and constraints of sidelobe suppression. Specifically, a slight modification is implemented to an existing nearly perfect reconstruction (NPR) filter to achieve a better sidelobe suppression...
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