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This paper experimentally verifies how the parallelogram planar array (PPA) can improve the space division multiplexing (SDM) performance of multiuser massive multiple‐input multiple‐output (MIMO) in line‐of‐sight (LOS) channels. PPA can reduce the spatial channel correlation (inter‐user correlation) without any increase in processing load. Channel state information (CSI) of up to 94 antenna elements...
This paper proposes a simplified user scheduling method suitable for our proposed antenna arrangement and an antenna configuration with multi-planar antennas, for Massive MIMO. Massive MIMO has two key problems: the heavy overhead of feeding back the channel state information (CSI) for the very large number of transmission/reception antenna element pairs and the huge computation complexity imposed...
This paper presents experimental results of our proposed null-space expansion scheme for multiuser massive MIMO in time varying channel. Multiuser MIMO transmission with proposed scheme can suppress inter-user interference (IUI) caused by outdated channel state information (CSI). The excess degrees of freedom (DoFs) of massive MIMO is exploited to perform additional null-steering...
Massive MIMO has two key problems: the low-transmission efficiency caused by channel state information (CSI) feedback overhead and huge computational complexity. Authors have proposed a practical application of Massive MIMO, that is, Massive Antenna System for Wireless Entrance links (MAS-WE), and the performance of the proposed systems have been verified by computer simulations and a propagation...
This paper proposes a novel Inter-User Interference (IUI) suppression scheme in time varying channels with null-space expansion for multiuser massive MIMO systems. The channel time variation deteriorates the accuracy of the channel state information at the transmitter (CSIT) and causes IUI on multiuser MIMO downlink transmission. In massive MIMO, the degrees of freedom (DoFs) of the base station antenna...
This paper experimentally verifies the potential of higher order space division multiplexing for multiuser massive MIMO in line-of-sight (LOS) channels. We previously proposed an inter-user interference (IUI) cancellation scheme and simplified user scheduling method on Massive Antenna Systems for Wireless Entrance (MAS-WE). In order to verify the effectiveness of the proposed techniques, channel state...
This paper proposes a practical application of Massive MIMO technology, Massive Antenna Systems for Wireless Entrance (MAS-WE), and its related inter-user interference (IUI) cancellation and scheduling techniques. MAS-WE, on which the entrance base station (EBS) employs a large number of antennas, can effectively provide high capacity wireless entrance links to a large number of Wi-Fi access points...
This paper proposes a novel clipping and filtering method employing transmit power control to improve the bit error rate (BER) performance in MIMO-OFDM transmission. The feature of the proposed approach is to perform the transmit power control before clipping and filtering to alleviate the BER degradation caused by clipping and filtering. Since the transmit power control to satisfy maximum signal-to-noise-plus-distortion...
Recent years, the increase in complicated wire harness increases the weight and consequently harms the environment friendliness especially in a luxury car. Therefore, it is expected that in-car network is effectively built by using wireless connection as well as wired connection. In this paper, we investigate the coverage area performance of MB-OFDM UWB in-car communication in the presence of plural...
This paper proposes a deterministic nonlinear distortion suppression scheme employing transmit power control for MIMO-OFDM systems. The feature of the proposed scheme is to suppress the nonlinear distortion by adjusting the transmit power level of each transmit antenna to be the maximum signal-to-noise-plus-distortion ratio (SNDR) and to perform MIMO signal detection using the appropriate transmit...
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