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We investigate the joint optimization of the group power allocation and prebeamformer for joint spatial division and multiplexing (JSDM) in massive MIMO downlink systems. In contrast with the approximated block diagonalization (ABD) prebeamformer which is derived by heuristic method in the original JSDM scheme and is restricted to semi-unitary matrix, general prebeamforming matrix together with group...
In this paper, we consider a wideband cognitive radio network (CRN) containing a single secondary user (SU) which can only serially sense multiple narrowband channels and thus maximize the utilization of perceived available channels. Before transmitting, during a period of time τ, SU allocates τi to each channel and senses whether the channel is available or not. When transmitting, SU allocates...
This paper addresses the optimization of quantization at local sensors under strict energy constraint and imperfect transmission to improve the reconstruction performance at the fusion center in the wireless sensor networks (WSNs). We present optimized quantization scheme including the optimal quantization bit rate and the optimal transmission power allocation among quantization bits for BPSK signal...
In this paper we present a quantized preceding scheme for the spatial multiplexing system equipped with MMSE-SIC receiver. The preceding matrix, consisting of a beamforming matrix and a power allocation matrix, is selected to maximize the minimum post-detection SINR of the MMSE-SIC receiver. Rather than the whole beamforming matrix, the beamforming vector for each data stream is selected sequentially...
We present a quantized precoding scheme for the V-BLAST system. The precoding matrix is decomposed into the multiplication of a beamforming matrix and a power allocation matrix. They are obtained by solving an optimization problem that maximizes the minimum post-detection SINR of the MMSE-SIC receiver under a total power constraint. The beamforming matrix is constrained to be in a predetermined codebook...
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