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This paper considers a multi-input multi-output (MIMO) wireless relay network, where the source S communicates wirelessly to the destination D via the help of a nonregenerative relay R. Previous studies are almost exclusively based on the assumptions of equal time-duration phases for S-R and R-D transmission and equal number of multiple antennas for every node, and the results concerning arbitrary...
Random beamforming (RBF) can obtain the same capacity scaling compared with the optimal precoding scheme in a sufficient number of users. However, the performance of RBF is decreased severely when with few users. In this letter, we propose a joint RBF and zero-forcing precoding scheme. Based on RBF, the initial scheduling is achieved, then these selected users are requested to feed back quantized...
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