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In this paper, we present the experimental path loss models for a typical indoor office propagation scenario. Channel measurements have been performed using a wideband channel sounder in the 28 and 38 GHz frequency bands. We derive path loss exponents and shadow fading factors based on the two popular path loss models, i.e., Close-in (CI) free space reference distance model and Floating-intercept...
To meet the increasing demand for 5G high datarate communications, millimeter-wave frequency bands are expected to be utilized. However, the existing channel models are not applicable to predict channel behaviors in these frequency bands. In this paper we investigate millimeter-wave channel model parameters including path loss exponents, delay and angular spread, and clustering parameters based on...
Millimeter-wave has come into the spot-light as the frequency band of the next generation communication systems. Prior to millimeter-wave communication system designs, the study of propagation characteristics is necessary. Especially, the power delay profile is one of the most important characteristics of channel fading that can be utilized for determining symbol duration. For the reason, we analyzed...
In this paper, we compared the performance of the Space-Alternating Generalized Expectation-maximization (SAGE) algorithm and Bartlett Beamformer (BBF) based on 28 GHz field measurement data. The performance was evaluated by: (1) the similarity of dispersion characteristics such as delay spread (DS) and angular spread (AS), (2) computational complexity by comparing computation time. Our results showed...
Path loss characteristics are usually studied in terms of distance and/or frequency under omni-directional antenna assumptions. When directional antennas are employed, an additional power loss may arise due to the beam mis-alignment between TX and RX beam axes. This paper investigates this additional power loss behavior based on field measurement data. The measurements were conducted in downtown Seoul...
Highly directive antennas or various beamforming techniques using large antenna arrays are expected to be adopted for overcoming the severe path loss on millimeter-wave bands. This paper investigates the effect of antenna beamwidth on millimeter-wave channel characterization and modeling. The indoor channel measurement campaigns were performed using a wideband channel sounder in the frequency band...
Since millimeter-wave (mmWave) frequency bands are strong candidates in new spectra for 5G mobiles, standardized propagation channel models are anticipated to be developed for 5G system evaluation and interference analysis. Instead of developing a new model, this paper takes the tact of examining the practicality of applying already existing, and commonly-used, ITU-R path loss models to the mmWave...
Propagation characteristics of millimeter-wave are being widely studied for utilization of the fifth generation (5G) mobile communication systems. To overcome the severe path loss on the high frequency band, highly directive antennas or beamforming techniques using large array antennas can be used to establish a reliable communication link between a transmitter and a receiver. In this paper, a recently...
To analyze multipath propagation channels from field measurement data, multipath parameter extraction algorithms are utilized. Among them, the Space-Alternating Generalized Expectation-maximization (SAGE) provides high-resolution performance on parameter estimations although it requires high computational complexity. On the other hand, Bartlett Beamformer (BBF) with low complexity is known to provide...
To analyze multipath propagation channels from field measurement data, multipath parameter extraction algorithms are utilized. Among them, the Space-Alternating Generalized Expectation-maximization (SAGE) provides high-resolution performance on parameter estimations although it requires high computational complexity. On the other hand, Bartlett Beamformer (BBF) with low complexity is known to provide...
In this paper, we analyze temporal and spatial distribution characteristics of multipath components considering for device-to-device (D2D) communications scenarios in urban very high-rise environments. Using the 3.7GHz wideband channel sounder and uniform circular array antennas, a channel measurement campaign has been performed at Gangnam of Seoul in Korea which the place very high-rise buildings...
Due to the limitation of power budget in millimeter-wave communication links, high-gain horn antennas are typically exploited instead of low-gain omni-directional antennas, especially for measurement campaign. To study millimeter-wave propagation characteristics, measured channels with a single set of narrow beamwidth antenna are required to synthesize wider beam width properties including omni-directional...
For 5G communications, millimeter-wave frequency bands are considered strong candidates for new spectra. However, propagation studies in these bands are still in their initial stages. Using 28 GHz measurements collected in railway and airport passenger terminals, this paper investigates path loss characteristics of large indoor environments. In particular, we conducted measurement campaigns in passenger...
Millimeter-wave propagation characteristics and channel models are being recently studied for applicability of the fifth generation (5G) mobile communication systems. To overcome the larger path loss on the higher frequency band above 6 GHz, highly directive antennas or beamforming techniques using large array antennas can be used to establish a reliable communication link between a transmitter and...
The deployment of 5G mobile communications at millimeter-wave frequency bands is currently the subject of intense debate. To help in conducting feasibility, planning and interference analysis studies for the introduction of millimeter-wave frequencies, this paper investigates path loss characteristics with steerable directional antenna measurements at 28 GHz. In particular, we focus on propagation...
In this paper we derive a non-line-of-sight (NLOS) path loss model between low-height terminals in rectangular street grid environments. With the Uniform Geometrical Theory of Diffraction, the path loss due to diffraction and scattering at corner edges is calculated for 1-Turn NLOS and 2-Turn NLOS links. In particular, we consider the case that 2-Turn NLOS links have multiple propagation route paths...
In this paper, we present path loss characteristics based on channel measurements in indoor commercial area at 28 GHz. The measurement campaign has been conducted in Seoul railway station and Incheon international airport terminal, which were selected to represent indoor hotspot regions in Korea. In order to compensate for the path loss increase due to higher frequencies, high-gain directional horn...
In this paper, we focus on multipath channel characteristics of low-height antenna links for mobile to mobile communications in urban street canyon environments. We present a wideband MIMO channel sounder and antennas used to measure multipath channel characteristics in the 3.7GHz frequency band and the result of calibration test to evaluate a system performance before field measurement. We carried...
In this paper, a geometrical approach is presented to estimate locations of the last hop of multipath based on measurement data. Statistic characteristics of last hops can be used to generate spatially consistent channels which are required for 5G channel modelling. The measurement was conducted with a 28GHz wideband channel sounder in urban street environments. Results show that most last hops are...
In this paper, we investigate multipath azimuthal distribution characteristics between terminals considering for mobile-to-mobile communication scenarios in urban street canyon environments. We carried out channel measurement campaigns on 3.7GHz frequency band at three sites in Seoul, Korea. The root mean square (r.m.s.) angular spread characteristics are analyzed with results of their distribution...
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