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Three-dimensional (3D) beamforming, which operates in both azimuth and elevation antenna domains, is a key technique to increase the signal-to-interference plus noise ratio of a receiver. This technique can also suppress the spatial interference in a cell. This paper proposes the application of 3D beamforming to a backhaul link in time-division relaying. We investigate the 3D beamforming effect in...
This paper presents field experiments on the downlink throughput performance of a 5G centimeter wave radio access system employing higher rank MIMO in a shopping mall environment and a long corridor environment. The shopping mall has complex reflection paths within its non-line-of-sight areas. The long corridor environment exhibits line-of-sight propagation with many reflection paths. The results...
In fifth-generation mobile communication systems (5G), it is necessary to significantly increase system capacity compared with 4G in order to accommodate rapidly increasing mobile data traffic. Cell densification has been considered an effective way to increase system capacity. However, severe intercell interference degrades the system capacity due to the increase of the line-of-sight environment...
The fifth-generation (5G) mobile communication system has attracted much attention to provide various kinds of mobile services and applications for 2020 and later. 28 GHz band is one of the most potent bands for 5G since super wide bandwidth of almost 1 GHz will be available. In the high frequency band, beamforming is mandatory to compensate large path loss. Hence beam tracking mechanism is important...
This paper describes our activities related to massive multiple-input multiple-output (MIMO) for use in 5G mobile communication networks. To achieve capacity enhancement and low power consumption for 5G wireless access systems, massive MIMO has drawn attention as one of the key technologies. Our research focuses on the utilization of massive MIMO in the low super-high-frequency (SHF) band, which is...
This paper presents field experiments on the downlink throughput and SNR performance of a beam forming 5G millimeter wave radio access system with beam tracking in the following urban environments: a street canyon and a shopping mall. The majority of the area in the street canyon environment exhibits Line-Of-Sight (LOS) propagation while the shopping mall includes significant Non-LOS (NLOS) areas...
The fifth-generation (5G) mobile communication system will utilize higher frequency bands with wider bandwidth for super high bit rate and large system capacity. Massive multiple-input multiple-output (Massive MIMO) beamforming (BF) technology has attracted much attention to compensate larger path-loss of a disadvantage at higher frequency bands. In low-SHF bands, approximately 100 MHz bandwidth is...
In order to tackle rapidly increasing traffic, distributed Massive MIMO (DM-MIMO) has been proposed for fifth-generation (5G) mobile communication systems. DM-MIMO coordinates lots of distributed transmission points (TPs) that are located in ultra-high density (UHD) and use various numbers of antenna elements for each TP. It can achieve drastic improvement of areal spectrum efficiency for 5G. It can...
In order to provide a wide variety of mobile services and applications, the fifth-generation (5G) mobile communication system has attracted much attention to improve system capacity much more than the 4G system. The drastic improvement is mainly realized by small/semi-macro cell deployment with much wider bandwidth in higher frequency bands. To cope with larger pathloss in the higher frequency bands,...
In order to tackle rapidly increasing traffic, ultra high-density distributed antenna system (UHD-DAS) has been proposed for the fifth generation (5G) mobile communication systems. Unlike the 4G systems, UHD-DAS dynamically creates user-oriented virtual cells by cooperating lots of UHD distributed antennas, and thus it can drastically improve areal spectral efficiency. However, a design of antenna...
In the fifth generation mobile communications system (5G), it is expected to use millimeter wave (mmW) radio access with very wide frequency bandwidths of more than 1 GHz. To achieve good coverage and availability, high gain antennas or arrays are essential in order to compensate for the higher propagation loss experienced at mmW frequencies relative to current cellular bands. This paper presents...
This paper presents some results of experimental trial in high mobility environment for the 5th generation (5G) mobile communication systems using 28 GHz band. In order to tackle rapidly increasing traffic for 2020 and beyond, new radio access network for the 5G mobile communication systems will introduce the use of higher-frequency bands such as spectra higher than 10 GHz to achieve higher capacity...
This paper describes the performance of a state-of-the-art cell range expansion (CRE) technique: an adaptive control CRE for enhanced inter-cell interference coordination (eICIC) in Heterogeneous Network (HetNet). The features of the proposed adaptive control CRE technique are described through comparison with those of conventional methods. With eICIC in a HetNet, system-level computer simulation...
5th generation mobile communication system using higher frequency band has gotten much attention, and massive-MIMO technologies have been expected to improve spectral efficiency dramatically. In order to reduce the complexity of massive-MIMO base station, the combination of analog beamforming (APAA: Active Phased Array Antenna) and digital MIMO signal processing for the multi-beam multiplexing is...
This paper presents field experiments on the downlink throughput performance of a beam tracking proof-of-concept system targeting 5G millimeter wave radio access in the following typical small cell environments: a courtyard, lobby, and underground parking area. The majority of the area in the tested environments is Line-Of-Sight (LOS) with cell radii of less than 60 m. The results show that the maximum...
For the 5th generation (5G) mobile communication system, small cells using higher frequency bands with wider bandwidth will be introduced to achieve super high bit rate transmission of several tens of Gbps. Massive MIMO beamforming (BF) is one of promising technologies to compensate for larger path-loss in the higher frequency bands. We have proposed joint processing of analog fixed BF and channel...
As the demand for higher transmission rates and spectral efficiency is steadily increasing, the research and development of novel mobile communication systems has gained momentum. This paper focuses on providing a comprehensive survey of research and development activities on fifth generation mobile communication systems reported in IEICE technical committee on radio communication systems. We try...
5G radio access networks achieve large communication capacity with small control signal overheads by combining low frequency bands in macro cells with high frequency bands in small add-on cells. This paper addresses the challenges and solutions for 5G group mobility where rapidly moving platforms carry several different user devices. Entrance capacity and control signal load are also studied by link...
This paper presents the overview of the experimental trial for the 5th generation (5G) mobile communication systems based on the collaboration between Samsung Electronics and NTT DOCOMO. In order to tackle rapidly increasing traffic for 2020 and beyond, new radio access network for the 5G mobile communication systems will introduce the use of higher-frequency bands such as spectra higher than 10 GHz...
To actualize the 5th generation (5G) radio access network with a super high bit rate and high capacity, small cells using both higher frequency bands and Massive MIMO technology are needed. Massive MIMO OFDM transmissions in the 20-GHz band at 20 Gbps that take advantage of higher beamforming (BF) gain have been studied. However, Massive MIMO OFDM causes a high peak to average power ratio (PAPR) because...
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