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Publications (189)
Non-terrestrial networks (NTNs) have attracted great interest for the development of 6G communication systems. Hence, it is very important to develop an accurate NTN clutter loss (CL) model for the deployment and optimization of the NTN communications. In this work, we conduct a multi-band channel measurement for the CL of NTN channels in a campus...
Integrated Sensing and Communications (ISAC) has been identified as a key technology in the Sixth-Generation (6G) as an enabler for environment-aware communications. Although many communications-centric channel models have been developed for dynamic scenarios, they can hardly be used for sensing applications since they rely on propagation character...
Automotive radar sensors are widely used in vehicles so as to allow the “advanced driver assistance systems (ADAS)” to work. As far as we are concerned, no mandatory regulations were established so far for interference control in the cases where multiple vehicles equipped with automotive radars exist in close proximity. Consequently, those inter-ve...
With the rapid development of the sixth generation (6G) communication systems, the extremely large antenna arrays (ELAAs) have attracted substantial attention in both academia and industry. As the array size increases, the so-called “near-field” effect, i.e. channel parameters varying with respect to the antenna’s position becomes evident. Conventi...
In this paper, a novel imaging algorithm that unifies the signal models for imaging targets located in the far and near fields using spherical wave is proposed. The algorithm, namely SSTI, incorporates the SIC technique to improve the contrast and quality of the results due to effectively reducing the interference induced by neighboring pixels. The...
When the conventional Space-Alternating Generalized Expectation-maximization (SAGE) algorithm is used to estimate the incident angle of the signal received by an antenna array with fixed aperture, the accuracy and resolvability of angle estimation are affected and limited by the aperture of the antenna array. Therefore, in order to improve the angl...
The wireless local area network (WLAN), particularly the wireless fidelity (WiFi) communication technology, has greatly facilitated human productivity and entertainment in recent decades. Accurate channel models are identified as a key point for the optimization of transceivers and network deployment in WiFi system. In this paper, we conduct a pass...
The demand for wideband data transmission in the “next-generation” mobile communication system is growing rapidly. As the frequency band around 10 GHz could be the option for 6th-generation (6G) wireless communication systems. In this paper, a recently conducted measurement campaign in the 6–14 GHz radio wave propagation channel using a large anten...
The ELAA and millimeter-wave systems have become key techniques for obtaining higher frequency spectrum efficiency in 6G communication systems. It is necessary to determine appropriate statistical models to describe the channel characteristics for the ELAA, such as spatial non-stationarity, dispersion in angular domain, and spatial consistency. Thu...
In recent years, with the rapid development of Advanced Driver Assistance Systems (ADAS), vehicular millimeter-wave (mmWave) radar plays an important role in urban intelligent transportation system. Self-interference caused by multipath in radar channel is a widely concerned problem. However, the research on radar channel propagation characteristic...
In this paper, a novel three-dimensional (3D) massive multiple-input multiple-output (MIMO) millimeter wave (mmWave) geometry-based stochastic model (GBSM) is proposed for sixth-generation (6G) vehicle-to-vehicle (V2V) channels. In the proposed GBSM, clusters in the environment are divided into static clusters and dynamic clusters. Furthermore, the...
In this paper, the novel extended space-alternating generalized expectation-maximization (SAGE) algorithm, providing joint propagation channel multi-path component (MPC) estimation and scatterer localization underlying spherical-wavefront multipath model, is proposed. Two geometry-based models are aided for estimating the first and last hop scatter...
During the last few years, with the decrease of their sizes and costs, Unmanned Aerial Vehicles (UAVs) became more feasible for their use in general-purpose applications. As an important basis for UAV applications, the Air-to-Ground (A2G) radio propagation channel has gained attention in the channel modeling literature. However, whereas the A2G pro...
Under the impetus of global communications organizations, 5G mobile communications becomes a hot technology and moves towards commercial use. In this paper, we propose an efficient downlink channel characterization scheme based on passive sounding in sub-6 GHz 5G commercial network. We first introduce the framework of passive sounding system contai...
Propagation graph (PG) is a stochastic channel simulation method for scattering propagation. In this article, an embedded-PG (EPG) approach, an extension of conventional PG, is proposed to simulate reflection and scattering multi-path behaviors in wireless channels. In this method, multiple propagation paths are categorized into scattering-path, re...
The demand for ever-increasing wireless data transmission rates and throughput area-densities, especially with regard to microcellular networks, internet access, back-hauling, inter-device transmission, and sensing applications, has spurred the exploration of new spectra in the millimeter-wave (30–300 GHz) and terahertz bands (0.1–10 THz), and the...
In parallel with the decrease in cost, size and weight of Unmanned Aerial Vehicles (UAVs) and the increase of their flight autonomy, many commercial applications are rapidly arising. Most of those applications rely on a communications system between a terrestrial base station and the UAV. Due to the UAV movement, time-variant channel models are req...
Cellular-connected unmanned aerial vehicles (UAVs) have recently attracted a surge of interests in both academia and industry. Understanding the air-to-ground (A2G) propagation channels is essential to enable reliable and/or high-throughput communications for UAVs and protect the ground user equipments (UEs). In this contribution, a recently conduc...
This paper presents 3–4 and 38–40 GHz wideband channel characteristics for industrial internet‐of‐things (IIoT) scenario based on measurements. The channel measurement equipment applied in the measurements consists of a programmable vector network analyzer and necessary auxiliaries. An extensive amount of data in line‐of‐sight (LoS) and non‐line‐of...
Cluster tracking is a mainstream approach for the study of time-variant channel characteristics. In the paper, we propose a power spectrum based sequential tracker (PSBST) to compensate for the disadvantages of existing cluster tracking algorithms. The proposed tracker identifies clusters via simple three-stage power spectrum processing. Furthermor...
Due to the decrease in cost, size and weight, \acp{UAV} are becoming more and more popular for general-purpose civil and commercial applications. Provision of communication services to \acp{UAV} both for user data and control messaging by using off-the-shelf terrestrial cellular deployments introduces several technical challenges. In this paper, an...
Due to the decrease in cost, size and weight, Unmanned Aerial Vehicles (UAVs) are becoming more and more popular for general-purpose civil and commercial applications. Provision of communication services to UAVs both for user data and control messaging by using off-the-shelf terrestrial cellular deployments introduces several technical challenges....
In this paper, we propose a novel three-dimensional (3D) geometry-based stochastic model (GBSM), i.e., a two-cylinder model, for unmanned aerial vehicle (UAV) multiple-input multiple-output (MIMO) Ricean fading channels. The received signal is a sum of the line-of-sight (LoS) component, single-bounced rays at the UAV side, single-bounced rays at th...
Millimeter-wave with ultra-wide bandwidth available and ability to pack massive number of antennas in a small area is considered the key enabler for the future generation communication systems. Accurate understanding and modeling of the ultra-wideband propagation channel with large-scale array configuration is essential. In this contribution, a rea...
Time difference of arrival (TDoA) technology is widely utilized for source localization, which stimulates many studies on performance-evaluation approaches for TDoA localization systems. Some approaches using simulations are designed merely for a simple Line-of-Sight (LoS) scenario while some other ones using experiments show high cost and ineffici...
Magnetic Induction (MI) communication is effective in underground tunnels for emergency rescue vehicle due to the small-size antenna. It can highly benefit from a cooperative decode-and-forward (DF) relay to achieve a higher data rate. However, its channel gain is extremely position-and-orientation-selective. The unreachable space increases the com...
This paper introduces a measurement campaign to investigate the characteristics of massive multiple-input multiple-output (MIMO) channels in both line-of-sight (LoS) and obstructed LoS suburban outdoor environments. The measurements are conducted at the center frequency of 3.5 GHz with a bandwidth of 160 MHz. The transmitter is equipped with a 4×8...
This paper presents a measurement-based analysis of wideband 39 GHz millimeter wave (mm-wave) dual-polarized propagation channel under the impact of foliage presence between a transmitter (Tx) and a receiver (Rx). The measurements were conducted in a rich-vegetation area, and the socalled direction-scan-sounding (DSS) method which rotates a horn an...
In this letter, a recently conducted measurement campaign in two suburban scenarios for investigating the low-height air-to-ground channels is presented. A Universal Software Radio Peripheral (USRP)-based channel sounder on-board a unmanned-aerial-vehicle (UAV) was exploited to record the real-time down-link signals of the live Long Term Evolution...
This paper evaluates the performances of channel emulation algorithms in multi-probe anechoic chamber (MPAC) by using plane wave (PW) and spherical vector wave (SVW) theories. Channel emulation in MPAC enables the over-the-air (OTA) testing of performances of wireless devices under realistic propagation scenarios, through setting excitation voltage...
In this paper, a recently conducted measurement campaign for unmanned-aerial-vehicle (UAV) channels is introduced. The downlink signals of an in-service long-time-evolution (LTE) network which is deployed in a suburban scenario were acquired. Five horizontal and five vertical flight routes were considered. The channel impulse responses (CIRs) are e...
In this paper, a recently conducted measurement campaign for unmanned-aerial-vehicle (UAV) channels is introduced. The downlink signals of an in-service long-time-evolution (LTE) network which is deployed in a suburban scenario were acquired. Five horizontal and five vertical flight routes were considered. The channel impulse responses (CIRs) are e...
In order to address the challenges in MIMO channel measurement and modeling for 5G communication scenarios, a CDM-based parallel channel sounder is developed and evaluated in this article. Compared to traditional TDM-based channel sounders, our parallel channel sounder supports eight-by-eight (8 x 8) MIMO communications, 200 MHz RF bandwidth, 5 ns...
Channel characterization is essential when planning wireless communication deployments. We consider the wireless channel characterization in a modern subway station and its corresponding entrance tunnel, a topic greatly overlooked in the literature.We setup a Long Term Evolution (LTE) Evolved NodeB (eNodeB) transmitter in the middle of the platform...
This paper provides new insights into the performance of Uplink and Downlink Splitting (UDS) in highly loaded wireless communication systems, in terms of both serving nodes and the number of users with high traffic activity. The study puts special focus on the gains that UDS could bring in terms of SINR and throughput when compared with systems wit...
Small and medium-size unmanned aircraft vehicles (UAVs) can only fly within short distance and ultra low altitude (<100m). It is of great interest to model the propagation in these conditions where there is an important influence of the environment. For the high cost of carrying out measurements and the safety concern, ray-tracing technique is consid...
In this paper, a recently conducted measurement campaign for vehicle to vehicle (V2V) propagation channel characterization is introduced. Two vehicles carrying a transmitter and a receiver respectively have been driven along an 8-lane road with heavy traffic. The measurement was conducted with 100 MHz signal bandwidth at carrier frequency of 5.9 GH...
This paper presents 70-77 GHz wideband channel characteristics of delay, spatial and polarimetric domains for small office and entrance hall scenarios. Based on measured multi-dimensional power spectra of delay, directions ( i.e. azimuth and elevation) of departure and of arrival, multipath clusters were detected using the K-means, threshold-based,...
The traffic explosion of mobile communications increasingly requires effective and realistic fifth-generation (5G) channel models. Recently, we have conducted measurement campaigns in lecture hall and laboratory scenarios using steerable beam antennas for characterizing 13-17 GHz channels. The Space-Alternating Generalized Expectation-maximization...
In this contribution, an algorithm based on the Space- Alternating Generalized Expectation-maximization (SAGE) principle is proposed for estimating the locations of scatterers involved in the last-hops of propagation paths when a large-scale antenna array is used in a receiver for channel measurement. The underlying generic parametric model is cons...
In this paper, a novel fingerprint-based localization technique is proposed which is applicable for positioning User Equipments (UEs) in cellular communication networks such as the Long-Term-Evolution (LTE) system. This technique utilizes a unique mapping between the characteristics of a radio channel formulated as a fingerprint vector and a geogra...
In this contribution, a measurement-based study of 60 GHz channels with 2 GHz bandwidth for in-band-full-duplex (IBFD) wireless communication systems is presented. Both the communication channel and the self-interference (SI) channel with different settings of transmit-receive antenna spacing and polarization configurations are measured in an indoo...
In this paper, measurements in a laboratory characterizing the 15 GHz band propagation channels are introduced. Both an omnidirectional antenna (ODA) and a 10◦ half-powerbeamwidth (HPBW) pyramidal horn antenna are deployed at the transmitter (Tx) in different measurements. The receiver (Rx) is equipped with a 10◦ HPBW horn antenna. A direction-scan...
In this contribution, a measurement campaign for massive multiple-input multiple-output (MIMO) channel characterization in both line-of-sight (LoS) and non-line-of-sight (NLoS) outdoor environments is introduced. The measurements are conducted at the center frequency of 15 GHz with a bandwidth of 4 GHz. A virtual 40×40 planar antenna array formed b...
In this letter, a unified propagation graph modeling approach is proposed which is applicable to predicting multipath radio propagation by considering both specular components (SCs) and diffuse components (DCs). In this approach, the semideterministic graph modeling is used to generate multi-bounce DCs, and a single-lobe directive model is applied...
In this letter, a spherical-wavefront-based parametric signal model is proposed by considering the architecture using a large-scale antenna array. A space-alternating generalized expectation-maximization (SAGE)-based localization algorithm is derived and adopted to localize the first-and last-hop scatterers along the propagation paths between the t...
Recently, a measurement campaign for characterizing the channels in underground subway environments was conducted in Shanghai, China. Downlink signals transmitted by 46 universal mobile telecommunication system cells deployed along a 34-km-long subway were collected. Channel impulse responses are extracted from the data received in the common pilot...
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 ho...
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...
Graph theory channel modelling is an efficient
approach to simulate multipath radio propagation including the
reverberation effect of electromagnetic waves. In this contribution,
without modifying the modelling framework, we proposed a
semi-deterministic channel modelling approach by associating the
scatterers with realistic environment objects, an...
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...