Kazuyoshi Oshima

Learn More
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 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)
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 proposes new partial channel state information (CSI) reporting for spatial scheduling in TDD/MIMO systems. In the proposed method, a terminal transmits pilot signals using transmit beams which have large channel gains between the base station (BS) and the terminal. Then, the BS can obtain partial CSI through responses of the pilot signals.(More)