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This paper presents the vision of 5G-MiEdge, a research project leveraging the benefits of merging MEC and mmWave technologies. Based on that vision, the most relevant use cases and services for the forthcoming Tokyo 2020 Olympics are proposed. The focus is on showing how integrating MEC and mmWave into the 5G network architecture can offer a much more effective system. That is achieved by means of...
Localization of unknown emitters is crucial to tackle illegal radios or radio jammers which may cause harmful interference to other communication systems and disrupt services. Conventional fingerprint-based localization techniques that utilize received signal strength or channel information as location fingerprints may face problems when dealing with emitters whose parameters, such as center frequency,...
mmWave meshed network is a promising architecture for cost-efficient wireless backhaul of millimeter-wave overlay heterogeneous network (mmWave overlay HetNet). As user distribution in practice is time-variant and spatially non-uniform, mmWave meshed backhaul should be controlled adaptively. This paper proposes a novel method to control mmWave meshed backhaul for efficient operation of mmWave overlay...
MmWave meshed network is a promising architecture for cost-efficient wireless backhaul of millimeter-wave overlay heterogeneous network (mmWave overlay HetNet). As user distribution in practice is time-variant and spatially non-uniform, mmWave meshed backhaul should be controlled adaptively. This paper proposes a novel method to control mmWave meshed backhaul for efficient operation of mmWave overlay...
5G communication networks will bring enhanced mobile broadband services to users and vertical markets supporting very wide range requirements from context-dependent applications. To support such applications in 5G, not only the conventional area traffic capacity but network energy efficiency is also a critical factor since energy consumption of information processing is also becoming an economic issue...
5G communication networks will bring enhanced mobile broadband services to users and vertical markets supporting very wide range requirements from context-dependent applications. To support such applications in 5G, not only the conventional area traffic capacity but network energy efficiency is also a critical factor since energy consumption of information processing is also becoming an economic issue...
Because of the license-free and wideband properties, 60 GHz band has become one of the candidates for the next generation wireless communication systems. In 60 GHz millimeter wave (mmWave) wireless systems, orthogonal frequency division multiplexing (OFDM) scheme can provide high data rate over than 6 Gbps; however, the high peak-to-average power ratio (PAPR) of OFDM signals will reduce the power...
Fingerprint-based localization is expected to be superior compared to other conventional range-based localization techniques especially in dense urban scenarios which are generally non line-of-sight (NLOS). However, when we consider localizing illegal radios whose parameters such as bandwidth and center frequency are unknown, there is a high possibility that the initial parameters used to create the...
In this paper we consider heterogeneous cellular network with a number of millimeter-wave (mmWave) small cells overlaying LTE macro cells. The impact of mutual interference in millimeter-wave band (57–64 GHz) is addressed and evaluated. We introduce several active interference cancellation techniques which are implemented at TX sides of mmWave small cell BSs equipped with adaptive antenna arrays....
Mobile traffic is increasing exponentially year by year and it will be over 1000 times higher than that of today in the near future. In order to tackle this matter, millimeter wave mobile access networks which can provide several GHz bandwidth attract international attention. This paper investigates the candidates of millimeter wave spectrum for 5G by referring to several ongoing 5G R&D projects...
Future heterogeneous networks (HetNets) are going to consist of cellular macro cell base stations (macro-BSs) and various types of small cell base stations (SC-BS), each operating in microwave and/or millimeter bands. Cell discovery of mm-wave SC-BSs is a challenging issue because of the limited communication range. In this paper, a location-based cell selection scheme that takes into account the...
The mobile traffic explosion predicted to be increased by 1000 times in the next 10 years has become a remarkable issue due to the proliferation of smart devices such as smart phones or tablets. Energy consumption of information processing is also becoming an economic issue for operators. It is a critical task to design the next generation cellular networks (5G) to be both spectral/energy efficient...
Millimeter-wave communication is expected to be the next-generation wireless communication. Local oscillator phase noise in such transceiver, however, degrades the performance of orthogonal frequency division multiplexing (OFDM) modulation that has been a key technology in high data-rate communication. To address this issue, a low-complexity inter-carrier interference (ICI) and common phase error...
This paper addresses an impedance matching problem with mutual coupling in the presence of signal and noise coupling in compact MIMO receivers. The optimal matching for minimizing the noise figure is employed. A closed-form result of ergodic capacity theoretically shows that the ergodic capacity on the optimal matching is independent of antenna characteristics in compact MIMO receivers under 3-D isotropic...
This paper proposes a design methodology of base station antenna configuration for multi-user (MU) multiple-input, multi-output (MIMO) systems to be robust against channel feedback errors. In the proposed scheme, the base station antenna configuration controls the covariance matrices of MIMO channels so as to keep the space of pre-coding weights stable against the channel variation. Specifically,...
In traditional heterogeneous cellular networks (Het-Net), base stations (BS) basically associate users based on received signal power. However, in the case of multiband HetNet, in which macro BSs and smallcell BSs use different frequency bands, this conventional cell association method is not effective because there is no interference between macro BSs and smallcell BSs. Additionally, there are huge...
In conventional wireless cellular networks, each user equipment (UE) is connected to one or a few local base stations (BS). However, the users' distribution in the network area is commonly fluctuating during a day. Especially, if a high density of small cell BSs is available, some user-dense areas or hotspots can be sensed by BSs. When there is some congeries of users in some area, conventional networks...
This paper proposes a new power amplifier's linearization architecture for a unified access point uses a wideband power amplifier and transmits multi-band signals concurrently for system's flexibility. To achieve high power efficiency and low interference of the access point, we evaluate a concurrent dual-band digital predistortion (DPD) technique for the wideband amplifier using a feedback loop....
This paper introduces a concept of cloud cooperated heterogeneous cellular network (C-HetNet) where small power pico basestations (BSs) overlaid on a macrocell are connected to cloud radio access network (C-RAN) to operate cooperatively with the macro BS. Since the macro BS assists operation of the pico BSs, it is easy to deploy multi-band HetNet where e.g. macro BS is operated at 2GHz band and pico...
This paper presents an indoor experiment to verify the battery-less sensor activation via multi-point wireless energy transmission with carrier shift diversity which realizes seamless coverage extension of the sensor activation. The multi-point scheme is employed to overcome path-loss attenuation. The carrier shift diversity has been developed to achieve uniform coverage of power transmission by combating...
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