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We study the degrees of freedom (DoFs) of a multiple-input multiple-output $K$-pair two-way relay channel with delayed channel state information (CSI) with $J$ distributed relays. In the considered model, we assume that the users are equipped with $M$ antennas and the relay with $N$ antennas. We propose two schemes, where the signaling design can be carried out either in each individual time slot...
In order to alleviate the multipath interference of the MIMO multi-relay system and improve the system spectrum efficiency, this paper presents a cyclic delay distributed precoding relay scheme. The channel state information (CSI) sent from the source node, according to its phase information and relay node's matrix match, sends the signals to destination node via specific relay node, rather than the...
For high end-to-end channel capacity, the amplify-and-forward scheme multiple-hop MIMO relays system is considered. The distance between each transceiver and the transmit power of each relay node are optimized to prevent some relays from being the bottleneck and guarantee the high end-to-end channel capacity. By proposing the transmission environment coefficient, the path loss is described in a new...
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