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In the 5G system, high frequency bands over 6 GHz (6–100 GHz) will be a key factor in providing a very wide bandwidth. Because of high path losses, these bands are considered to use for small cells. To design radio links with high accuracy and evaluate 5G system performances for various scenarios, channel characteristics must be clarified. In this paper, we clarify channel characteristics in an outdoor...
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...
This paper presents time-variant channel characteristics at the 20-GHz band for line of sight (LoS) scenarios in an urban street canyon environment. A measurement campaign is conducted using a channel sounder for the 20-GHz band with a 50-MHz-bandwidth orthogonal frequency-division multiplexing signal. A uniform planar array (UPA) in a 16-by-16 matrix is used on the receiver side to measure time-variant...
The next generation (5G) mobile communication system has been the focus of studies recently. One of the approaches to enable this system is utilizing the high-SHF band (over 6 GHz) and EHF band (mainly 30–100 GHz). Considering scenarios using high-SHF and EHF bands for small cells, to design radio links with high accuracy, the channel characteristics of “Outdoor-to-Indoor (O2I) propagation” must be...
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...
In this study, it is investigated the validity of applying nonlinear device model to estimate distorted spectrum shapes of the OFDM signals for spectrum sharing studies. We used an LNA and two LNBs, which are off-the-shelf devices and the spectrum shape of OFDM signal distorted by the nonlinear devices, are evaluated by the means of model-based estimation and indoor experiment. As the results, the...
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