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This letter considers the optimal channel sensing sequence (CSS) design for spectrum handoff in an overlay multi-channel cognitive radio networks (CRNs). We study the frame structure for spectrum handoff in the Rayleigh fading channels and formulate the CSS design problem as a sequential decision-making problem. Considering the secondary link maintenance probability during a frame, we design the optimal...
Filter-and-forward (FF) relay protocols can combat the impact of frequency-selective fading. This paper studies filter design for FF multicast multi-relay networks. We formulate the sum-rate maximization problem with individual relay power constraints. Different from the sum-rate maximization problems of general channel setups, the studied sum-rate problem cannot be directly tackled using the popular...
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