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This paper considers a frequency-division-duplexing (FDD) massive multiple-input multiple-output (MIMO) system that operates with two-stage beamforming based on user grouping. In this system, we propose a first stage beamformer and a user grouping method for the two-stage beamforming. The proposed first stage beamformer maximizes an approximate sum rate calculated from the second-order statistic of...
Massive MIMO technology is needed as the volume of data demand increases. An increase in the number of RF-chains as the number of antennas increases causes hardware complexity and system cost increase. This causes the application of the actual communication system to be delayed. In this paper, we show the applicability to massive mimo by expanding the unit load modulation module with single RF-chain...
The transmission structure of quadrature spatial modulation (QSM) restricts the signal constellation to be lattice style. Meanwhile, both the minimum amplitude and minimum Euclidean distance (MED) in quadrature and in-phase domain should be taken into account for the constellation design of QSM. In this paper, a non-uniform lattice constellation is designed for quadrature spatial modulation (QSM),...
This paper presents numerical simulation results to evaluate the interference effect from maritime ESIM to 5G mobile service using 28GHz frequency band. An interference scenario considering the real deployment are established and the Minimum Coupling Loss method is used. From the numerical results, we confirm that the separate distance need to guarantee 5G service quality for outdoor environments...
We consider an antenna selection scheme in single-user massive MIMO systems. We formulate a rate maximization problem with a sparsity promoting regularization function. The proposed algorithm allocates sparse power allocation among transmit antennas. It achieves a very high sum rate close to the optimal full search algorithm.
The overall duration of random access (RA) in millimeter-wave (mm-wave) cellular systems with directional beams is protracted because preambles should be transmitted in all directions of Tx and Rx beams. In this paper, two different types of RA preambles (RAPs; TYPE-1 and TYPE-2) are proposed with multiple antenna arrays to reduce the RA duration. It is shown by simulation that the TYPE-2 RAP is well-suited...
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