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The number of users is interested in generating new contents by utilizing and editing existing videos. In order to utilize the existing videos, a video retrieval system is necessary to retrieve an appropriate source of videos. However, since the existing video retrieval system is based on keyword matching, there is a limitation to find videos they want. In this paper, we propose a query expansion...
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...
In this study, we introduce an efficient dual-band polar transmitter architecture to reduce the required bandwidth of phase-modulated signal for polar transmitter. We derive a time-domain expression of dual-band band-pass signal, and show comparison of receiving signal-to-noise performance between the conventional polar transmitter and the proposed scheme. Simulation results show two-stage digital...
In this paper, we propose hybrid beamforming scheme for multi-user transmission in millimeter wave (mmWave) communications. The sum rate maximization problem considering limited feedback is formulated and solved by the joint scheduling and hybrid beamforming algorithm with two-stage channel state information (CSI) feedback framework. In the proposed scheme, the base station (BS) first narrows down...
In directional energy transmissions, a radio frequency (RF) energy source needs to monitor each sector to achieve higher RF energy transmission efficiency. However, since the distribution of harvesting nodes can be dynamically changed in mobile environments, it is difficult to obtain the exact numbers of harvesting nodes in all sectors within limited time. In such a situation, the operations of RF...
In this paper, a new cell selection technique is proposed for millimeter-wave (mm-wave) considering hybrid beamforming structure in data transmission stage. In order to reduce processing time for channel estimation, cell and beam synchronization signals (CBSS) are proposed which are simultaneously transmitted from multiple beams. It is shown by simulation that the proposed technique with the CBSS...
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.
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