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In massive multiple-input multiple-output (MIMO) systems, idle users may passively overhear the signal transmitted to the intended user, known as internal eavesdroppers. In order to improve the secrecy performance, artificial noise (AN) is used jointly with maximum ratio transmission (MRT) precoding. Since the idle users can be anywhere in the cell, we investigate the secrecy outage probability for...
In this paper, the capacity of MIMO relay channel with decode and forward (DF) scheme is investigated, where each node within the system quipped with multiple antennas and located in an environment with distance-dependent path loss. In order to achieve the maximum capacity of the system, the optimal power allocation (OPA) among the nodes and the transmit antennas is analyzed under the assumption that...
In this paper, the problem of power allocation in the amplify-and-forward (AF) cooperative network is investigated based on the achievable maximum signal-to-noise ratio at the destination node. With assumptions that the source node has the perfect channel state information, optimal power allocation algorithms are developed for the relay networks under two scenarios: the full cooperative scheme with...
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