massive mimo hybrid beamforming channel estimation for massive mimo pilot contamination 5g wideband massive mimo hybrid analog-digital uplink-downlink duality imperfect csi sum rate duality per antenna power constraint spectrum sensing usrp labview transceiver design weighted sum rate optimization sensing throughput tradeoff mse rate coordinated base station miso mimo millimeter wave faster than nyquist v2x v2i v2v csi estimation beamforming scheduling
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