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The performance of adaptive beamformer will degrade in the case of jammer motion and shaking platform. In order to improve the performance of adaptive beamformer, an improved null broadening adaptive beamforming method is proposed. The proposed method is realized by the reconstruction of interference-plus-noise covariance matrix. Null broadening can be obtained by the proposed method and the null...
The communication process of a secure relay system usually has two stages: source to relay, relay to destination. When the source is only equipped with one antenna, the information transmission is not secure during the first stage. In this paper, we propose a novel three-stage scheme to transmit confidential messages in an amplify-and-forward (AF) relay system. In the proposal, during the additional...
In this paper, joint beamforming and power allocation via cooperation feedback and local feedback is considered in cognitive radio (CR) downlink where primary user (PU) coexists with multiple secondary users (SUs). The objective is to maximize the sum-rate of SUs while satisfying interference power constraint to PU and the total transmission power constraint of SUs. To effectively mitigate the interference...
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