Kazuyoshi Oshima

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This paper presents uplink spatial scheduling with adaptive transmit beamforming, where terminals perform system-based transmit beamforming in multiuser multi-input multi-output (MIMO) systems. In the presented spatial scheduling, the base station (BS) selects appropriate combination of terminals and their transmit beamforming among possible terminals. In(More)
This paper proposes a novel downlink spatial scheduling algorithm in multiuser MIMO systems, which selects good combination of terminals and base station(BS)'s transmit beams so that the BS's beams nullify inter-stream interference at the selected terminals. In the derivation process, we reveal new property that the optimization problem of downlink spatial(More)
This paper presents downlink spatial scheduling which nullifies interference among multiplexed signals perfectly in multiuser MIMO systems. Under the base station's zero-forcing transmit beamforming, each terminal can receive packet of interest without interference from the other multiplexed packets. The scheduling algorithm successively selects appropriate(More)
— In this paper, we propose OFDMA/TDD/MIMO system with spatial scheduling, showing frame structure and control procedures to achieve the proposed system. The frame structure includes all functions required for spatial scheduling in a subband of 200kHz and in a frame time of 2.5ms. We show that the frame structure can be a realistic solution to achieve(More)