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In this paper, we investigate the downlink of millimeter-wave multi-user massive MIMO systems, and propose a hybrid precoding scheme based on a sub-array architecture to achieve a better compromise between hardware cost and system performance. The proposed precoding scheme performs analog precoding and digital precoding at the transmitter with the generalized sub-array architecture. It implements...
This letter investigates the sum rate maximization in amplify-and-forward (AF) MIMO two-way relay channels (TWRCs) combined with relay antenna selection (AS). We consider the circuit power consumption in this letter and hence the optimization of the number of active RF chains is necessary. In particular, a greedy relay AS algorithm is proposed to avoid the exhaustive search. The proposed algorithm...
In this paper, we investigate the maximization of energy efficiency (EE) in amplify-and-forward (AF) MIMO relay systems combined with relay antenna selection. An iterative algorithm is proposed to jointly select the active receive and transmit antennas at the relay, as well as optimize the transmission power of the source and relay. Specifically, the antenna selection process is based on a derived...
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