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Recently, the use of unmanned aerial vehicle (UAV) is going to receive great interest in various areas. As a newly emerging area, UAV-aided communications encounter unique communication scenarios and thus need corresponding UAV channel models for better design of such UAV communication systems. In this paper, we propose a three-dimensional (3D) sphere UAV air-to-ground (A2G) multiple-input-multiple-output...
Unmanned Aerial Vehicles (UAVs) have been a promising platform in realizing high-speed wireless networks. As an emerging scenario, the UAV communication is distinct from widely used cellular systems or vehicular networks, requiring the development of practical yet easy-to-use channel models. In this paper, for the first time we introduce the geometry-based stochastic model (GBSM) to UAV channel modeling,...
The Unmanned Aerial Vehicle (UAV) is going to play an important role in fifth generation communication systems for establishing seamless coverage in various scenarios due to its low-cost and flexibility. Understanding the UAV wireless channels is the basis for its application. In this paper, a recently conducted measurement campaign for the UAV wireless propagation channel in a suburban scenario in...
Smart Cities are the most challenging and promising technological solutions for absorbing the increasing pressure of population growth, while simultaneously enforcing a sustainable economic progress as well as a higher quality of life. Several technologies are involved in a potential Smart City deployment, although data are the fuel to achieve the demanded and mandatory smartness. Data can be obtained...
With co-time co-frequency full duplex (CCFD) in 60 GHz band, self interference (SI) has different characteristics due to larger wireless path loss and beamformed system compared to current band under 6 GHz (normal band). In this paper, we present real SI channel measurement results and analysis to consider indoor CCFD in 60 GHz band. The results show that the narrow beam antennas can effectively suppress...
In this contribution, a channel measurement campaign was carried out which employed directional scanning approach to capture the temporal and spatial characteristics of higher-frequency-band (HFB) wave propagation channel ranging from 13 to 17 GHz in lecture hall environments. The omni-directional antenna was equipped in the transmitter (Tx), and a horn antenna of certain half-power-beamwidth (HPBW)...
In this paper, the Space-Alternating Generalized Expectation-maximization (SAGE) approach is applied to estimating the parameters of multipath components (MPCs) in propagation channels with the observations being the signal eigenvectors (SEVs) calculated from channel impulse responses (CIRs) collected via direction-scan sounding (DSS), i.e. rotating a horn antenna in directions. The performance of...
In this paper, by using a multiple-input multiple-output (MIMO) antenna array, a channel measurement campaign in outdoor environments is introduced. The measurement campaign captures the spatial characteristics of centimeter wave (cm-wave) propagation at the center frequency of 26 GHz . By using the parametric approach of the Space-Alternating Generalized Expectation-maximization (SAGE) algorithm,...
In this contribution, a recently conducted measurement campaign is introduced for investigating the characteristics of propagation channels for massive multiple-input multiple-output (MIMO) scenarios in a lecture hall environment. The channel responses for waves of higher frequency band ranging from 13 GHz to 17 GHz was measured with a vertically standing virtual two-dimensional (2-D) 20 × 20 = 400-element...
In this contribution, a measurement campaign for high- speed-train (HST) channel is introduced where the down- link signals of in-service Long Time Evolution-Advanced (LTE-A) network deployed along the HST railway between Beijing to Shanghai are acquired. Channel impulse responses (CIRs) are extracted from received signals, and concatenated power delay profiles (CPDPs) are illustrated. According to...
In this paper, a measurement campaign in high-speed-train (HST) environments is introduced where the downlink signals of an in-service Universal Mobile Terrestrial System (UMTS) deployed along a HST railway between Beijing and Shanghai were required by a single receiving antenna. Channel Impulse Responses (CIRs) are extracted from the data received in Common PIlot CHannels (CPICHs). The train speed...
A channel measurement campaign is introduced which makes use of direction-scan-sounding (DSS) to capture the spatial characteristics of higher-frequency-band (HFB) wave propagation with center frequency of 15 GHz in classroom environments. The transmitter (Tx) is equipped with an omni-directional antenna, while the receiver (Rx) with a pyramidal horn antenna of either 10° - or 30°-half-power-beamwidth...
In this paper, a recently conducted measurement campaign for High-Speed-Train (HST) channels is introduced where the down-link signals of in-service Long Time Evolution-Advanced (LTE-A) networks deployed along a HST railway between Beijing to Shanghai were acquired. The channel impulse responses (CIRs) are extracted from the received Cell-specific Reference Signals (CRSs). The results show that, most...
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...
In this contribution we present the results of a channel measurement campaign carried out in indoor hall scenarios with 2 GHz bandwidth centered at 72 GHz. Horn antennas of the same type were employed at both the transmitter and the receiver. Frequency responses have been captured when the Rx horn antenna swept at 36 azimuth and 3 elevation angles with 10° interval. Then, coherence bandwidths are...
In this contribution, a recently conducted measurement campaign in underground subway environments is introduced. The downlink signals in an in-service UMTS network are collected in the subway carriage by using an Universal Software-defined Radio Peripheral (USRP) equipment and used to extract the channel impulse responses (CIRs) between a user equipment and UMTS stations. A high-resolution parameter...
In this paper, we propose a blind estimation method for the antenna mutual coupling matrix and the direction of arrival. First of all, the higher order cumulants based blind estimation method is used to calculate the steering vector of the array. The estimated steering vector can differ from the true steering vector by a factor of -1 or by exchanging of the real and imaginary parts. These differences...
In this paper, channel measurement campaigns at center frequency of 72 GHz with 2 GHz bandwidth conducted by Huawei company are introduced. The transmitter and receiver make use of similar horn antennas which are rotated step by step in the directional domains to capture the frequency spectra of spatial channels in line-of-sight and non-line-of-sight scenarios of indoor environments. The data is applied...
In this paper, a novel interference cancellation (IC) algorithm is introduced which is applicable to improving the signal to interference power ratio (SIR) for the signals of a specific user by estimating the channels accurately. In this algorithm, a so-called generalized array manifold (GAM) generic channel model is adopted for parameter estimation which makes use of the Firstorder Taylor-series...
Graph theory-based channel modeling is an efficient approach to simulate multipath propagation taking into account the reverberation of electromagnetic waves. In this contribution, without modifying the modeling framework, we proposed a semi-deterministic graph modeling approach by associating the scatterers with realistic environment objects, and by calculating the coefficients of the propagation...
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