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In this paper, we investigate power-allocation and relay-selection algorithms for amplify-and-forward (AF) cooperative relay systems under imperfect channel estimation. Based on maximizing a tight capacity lower bound, a closed-form formula for optimal power allocation under a given relay is first derived and then used to establish an optimal relay-selection algorithm. By exploring the asymptotic...
In this paper, we investigate a cooperative jamming strategy combined with a null-steering beamforming technique (CJ-NB strategy) for physical-layer security. To evaluate the achievable secrecy rate, the source input distribution is assumed to be Gaussian, and the achievable secrecy rate can be formulated as an optimization problem for power allocation (PA). By solving the problem, an asymptotically...
In this paper, we propose a joint relay weighting (RW) and power allocation (PA) algorithm for a two-way amplify-and-forward relay system, in which each participating node is equipped with a single antenna, to minimize the sum of mean-squared errors (sum-MSE) of the received signals at two source nodes. The algorithm alternates between two parts: obtaining the optimal RW for a specific PA, which is...
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