Raffaele D'Errico

• Cea Leti

In this paper, we present the results of a measurement campaign conducted in an indoor environment with multiple Reconfigurable Intelligent Surfaces (RISs), including a transmitting and a reflecting one in the Ka band. On the receiver side, a virtual array of monopole antennas is considered. The reconfiguration capabilities of both binary RISs are...

Reconfigurable intelligent surfaces (RISs) constitute the key enabler for programmable electromagnetic propagation environments and are lately being considered as a candidate physical-layer technology for the demanding connectivity, reliability, localisation, and sustainability requirements of next-generation wireless networks. In this paper, we fi...

Next-generation wireless networks will see the convergence of communication and sensing, also exploiting the availability of large bandwidths in the Terahertz (THz) spectrum and electrically large antenna arrays on handheld devices. In particular, it is envisaged that user devices will be able to automatically scan their surroundings by steering a...

Reconfigurable Intelligent Surfaces (RISs) are announced as a truly transformative technology, capable of smartly shaping wireless environments to optimize next-generation communication networks. Among their numerous foreseen applications, Reflective RISs (RRISs) have been shown theoretically beneficial not only to enable wireless localization thro...

Reconfigurable Intelligent Surfaces (RISs) constitute the key enabler for programmable electromagnetic propagation environments, and are lately being considered as a candidate physical-layer technology for the demanding connectivity, reliability, localization, and sustainability requirements of next generation wireless networks. In this paper, we f...

In this work, we study hybrid precoding techniques applied to multi-user Transmitting Reconfigurable Intelligent Surface (T-RIS) systems. The T-RIS considered here is a large array of electronically reconfigurable antenna elements illuminated by a small set of active sources. When it comes to digital signal-processing techniques applied to T-RIS sy...

Next-generation wireless networks will see the convergence of communication and sensing, also exploiting the availability of large bandwidths in the Terahertz (THz) spectrum and electrically large antenna arrays on handheld devices. In particular, it is envisaged that user devices will be able to automatically scan their surroundings by steering a...

In this article, we analyze the characteristics of indoor radio channels at millimeter waves. Measurements were performed using a large virtual antenna array (VAA), for massive multiple input multiple output (MIMO) applications. The results in terms of correlation and multipath components (MPCs) characteristics are analyzed for the whole large arra...

Reconfigurable Intelligent Surfaces (RISs) constitute the enabler for programmable propagation of electromagnetic signals, and are lately being considered as a candidate physical-layer technology for the demanding connectivity, reliability, localization, and sustainability requirements of next generation wireless communications networks. In this pa...

In this paper, we present a multi-band channel characterization at sub-THz. Three measurement campaigns were conducted in an indoor environment, for different frequency ranges: 125-155, 235-265 and 270-300 GHz, by exploiting a single (vertical) polarization antennas and performing only the azimuth plane. Line-of-Sight and Non-Line-of-Sight, given b...

Various visions on the forthcoming sixth Generation (6G) networks point towards flexible connect-and-compute technologies to support future innovative services and the corresponding use cases. 6G should be capable to accommodate ever-evolving and heterogeneous applications, future regulations, and diverse user-, service-, and location-based require...

Various visions of the forthcoming sixth generation (6G) networks point toward flexible connect-and-compute technologies to support future innovative services and the corresponding use cases. 6G should be able to accommodate ever evolving and heterogeneous applications, future regulations, and diverse user-, service-, and location-based requirement...

The design of 6th Generation (6G) wireless networks points towards flexible connect-and-compute technologies capable to support innovative services and use cases. Targeting the 2030 horizon, 6G networks are poised to pave the way for sustainable human-centered smart societies and vertical industries, such that wireless networks will be transformed...

Industrial internet of things (IIoT) is an emerging area that fifth-generation (5G) mobile communication system penetrates industrial manufacturing applications. The indoor factory has larger space and there are a lot of metal machine tools distributed in it, which makes its radio propagation characteristics and corresponding channel models signifi...

This paper proposes a measurement based modeling of D-band indoor channels. Different indoor environments were considered including Line-of-Sight (LOS) and Non Line-of-Sight (NLOS) conditions. Double steering at the transmitter and receiver sides was performed allowing angular characterization of the channel. Path loss, delay spread, angular spread...

Digital maps will revolutionize our experience of perceiving and navigating indoor environments. While today we rely only on the representation of the outdoors, the mapping of indoors is mainly a part of the traditional SLAM problem where robots discover the surrounding and perform self-localization. Nonetheless, robot deployment prevents from a la...

Recent results about mobile-to-mobile radio channel dynamics are analyzed, considering indoor peer-to-peer, body-centric and vehicule-to-pedestrian transmissions. Investigations are based on various experimental campaigns from 2.4 to 4 GHz. Regarding peer-to-peer and body-centric scenarios, measurements conducted in room-to-room and in-room environ...

This paper presents a vehicle to pedestrian (V2P) channel model based on an extensive measurement campaign carried out at 3.8GHz. Several propagation conditions were investigated and different mobility patterns were measured. A stochastic channel modeling approach is proposed and parametrized. The model consists of two components, i.e. the first pa...

In this paper, we aim at improving pedestrian navigation experience based on standard narrow-band wireless technologies and simple radio metrics. The proposed solution takes benefits from body shadowing effects traditionally experienced at body-worn devices, for instance over off-body radio links with respect to fixed elements of infrastructure. Th...

In this paper, we aim at improving pedestrian navigation experience based on standard narrow-band wireless technologies and simple radio metrics. The proposed solution takes benefits from body shadowing effects traditionally experienced at body-worn devices, for instance over off-body radio links with respect to fixed elements of infrastructure. Th...

Beamsteering massive arrays have been recently proposed for indoor environment mapping in next 5G scenarios, thanks to their capability to better penetrate materials with respect to current laser or camera-based systems. To this purpose, in the perspective of integrating mobile radars in small portable devices, architectures based on non-coherent p...

This paper presents a benchmarking analysis of wideband channel characteristics in two indoor environments in the 59-65 GHz and 80.5-86.5 GHz bands. Measurements were carried out by performing mechanical steering of directive antennas at both the transmitter and receiver sides. Omnidirectional power delay profiles were obtained from directional mea...

In this paper we investigate the possibility of adopting millimeter-wave technology with passive RFID based on backscattered signals to perform tag localization with a single reader equipped with high-directivity beamsteering antennas. The numerical results concerning the considered architecture show that, despite the high path-loss at 60 GHz, it i...

The mm-wave spectrum will be of significant importance to 5G mobile systems. There are multiple challenges in designing transceiver architectures and air interfaces in this spectrum. This paper is an attempt to explain some of these challenges and their interactions as means of enabling robust system design in near future.

This invited paper details some of the hardware modelling and impairment analysis carried out in the EU mmMAGIC project. The modelling work includes handset and Access Point antenna arrays, where specific millimeter-wave challenges are addressed. In power amplifier related analysis, statistical and behavioural modelling approaches are discussed. Ph...

In this paper, we propose a new technique for the future fifth generation cellular network wireless backhauling. We show that hundreds of bits per second per Hertz (bits per second per Hz) of spectral efficiency can be attained at a high carrier frequency (such as 26 GHz) between large antenna arrays deployed along structures (such as lamp posts) t...

The emerging 5th generation (5G) cellular systems raise unprecedented requirements on data rates, link reliabilities, end‐to‐end (E2E) latencies, and the support of a portfolio of different scenarios and service types. To satisfy 5G requirements, cutting‐edge technology components are proposed both in academia and in industry. The design and evalua...

This paper analyzes the frequency dependency of the radio propagation channel's root mean square (rms) delay spread (DS), based on the multi-frequency measurement campaigns in the mmMAGIC project. The campaigns cover indoor, outdoor, and outdoor-to-indoor (O2I) scenarios and a wide frequency range from 2 to 86 GHz. Several requirements have been id...

Driven by the data requirements envisioned for the fifth generation (5G) of wireless services, the mobile community is focusing on breaking the spectrum gridlock that characterizes cellular technology. In this context, researchers and industries have identified millimeter-wave (mmWave) communications as a key enabler for providing unprecedented rad...

In this paper we introduce a channel model for personal radar applications where a millimeter-wave (mm-wave) massive array is required to scan the environment and to reconstruct a map of it. The analysis is based on measurement campaigns, in a corridor and an office room, performed by using mm-wave massive arrays. In such a context, we aim at chara...

This deliverable describes the extensive multi-frequency channel measurement and simulation campaigns conducted in the mmMAGIC project, covering mm-wave 5G propagation scenarios. The data is evaluated to characterize environment-specific propagation effects. Based on the findings, refined modelling approaches are developed and embedded in a geometr...

This paper studies time correlation functions of mobile-to-mobile (M2M) fading channels, based on a measurement campaign carried out in an indoor environment at 2.48 GHz. The time correlation properties are characterized for different mobility patterns. In order to depict the time correlation properties, a general model for the time correlation fun...

This paper presents wideband channel measurements in an office environment in the 62 GHz and 83 GHz frequency bands. Measurements were performed with a VNA and the mechanical steering of directive antennas at both the transmitter and receiver side, allowing a double-directional angular characterization. A comparison of propagation characteristics s...

The adoption of massive arrays for simultaneous localization and mapping (SLAM) or personal radar applications enables the possibility to detect and localize surrounding objects through an accurate beamforming procedure. Unfortunately, when a classical constant false alarm rate (CFAR) approach accounting for ideal-pencil beam pattern is adopted, am...

In this paper, we present novel ultrawideband (UWB) off-body channel measurement campaigns in indoor environments aiming the characterization of the delay and the angular properties of the channel. Measurements were performed by using isolated UWB antenna and body-mounted antennas on different positions. Multipath and cluster parameters are estimat...

This paper presents the results of an experimental-based body-to-body (B2B) channel characterization in an indoor environment at 2.4 GHz in the Industrial, Scientific and Medical band. The peculiarity of B2B channels suggests the extension of classical stochastic models toward one that is aware of the reciprocal position and orientation of the bodi...

The idea to adopt massive arrays for personal radars applications is facing a rapid growth, thanks to the high scanning resolution achievable with the large number of antennas employed. In fact, such multi-antenna systems enable the possibility to detect and localize surrounding objects through an accurate beamforming procedure. In this paper we sh...

In this paper we present two indoor measurement campaigns performed using millimeter-waves massive arrays in a corridor and in an office room. In particular, we characterize the delay spread of the backscattered channel responses which can be exploited in future personal radars applications for indoor localization and mapping.

This paper analyzes the temporal correlation properties of mobile-to-mobile (M2M) channels, based on an extensive measurement campaign carried out in an indoor environment at 2.48 GHz. In order to model the dynamic channel characteristics, short- and long-term fading behaviors are extracted. The auto-correlation function (ACF) is characterized for...

This paper presents a comparison of different three dimensional (3D) MIMO Over-The-Air (OTA) multi-probe configurations. Spatial correlation is used as metric to evaluate the setup accuracy, considering different antenna probes emplacements and Elevation Spread (ES). Simulation results are presented in uniform and single cluster channel models for...

In this paper, we present an accurate and realistic simulation for body area networks (BAN) and body-to-body networks (BBN) using deterministic and semi-deterministic approaches. First, in the semi-deterministic approach, a real-time measurement campaign is performed, which is further characterized through statistical analysis. It is able to genera...

This letter presents a time-varying channel model implementation for multiple body area networks including both on-body an body-to-body links. Channel time-correlation properties are modeled with an autoregressive method with the exception of body-to-body short-term fading. This last component shows an important dependence on the body positions and...

Millimeter-waves are expected to play a key role in next 5G scenario due to the availability of a large clean unlicensed bandwidth at 60 GHz and the possibility to realize packed antenna arrays, with a consequent increase of the communication capacity and the introduction of new functionalities, such as high-definition localization and personal rad...

In this paper, we present a comparison between Off-Body channel characteristics estimated with Space-Alternating Generalized Expectation-Maximization (SAGE) algorithm from measurement data and those obtained from ray-tracing simulated data. Measurement data were obtained considering a body-worn antenna on a phantom and an external one simulating an...

The temporal variation of spatial correlation between on-body radio links are empirically characterized for different walking scenarios. Non-stationary behaviors are highlighted and a model is proposed for the long-term fading correlation. Index Terms—Body Area Networks, channel modeling, correlation , measurement. I. INTRODUCTION Body Area Network...

Conventional feeding coaxial cable can affect the impedance measurement of small antennas. Rather than trying to eliminate the disturbing cable, a technique based on the characterization of the cable effect has been used recently for the accurate measurement of electrically small antenna impedance. In this paper we discuss about the use of this met...

This paper presents an indoor Body-to-Body narrowband channel model based on experimental data, acquired through a real-time dynamic measurement campaign at 2.45 GHz. The radio channel was investigated under different communication conditions, according to the movement performed by some human subjects and to their mutual position. Several node loca...

This paper provides an overview of the project Critical and Rescue Operations using Wearable Wireless sensor networks (CROW 2) and discusses the related research challenges and upcoming objectives. The project objective is to provide ubiq-uitous wireless communication and monitoring systems enabling life-critical and rescue operations. In this cont...

This paper presents new measurement methodologies for ultra-miniature antennas. A first one is dedicated to the impedance measurement and the second one to the radiation measurement. Both methods are detailed focusing on an ultra-compact antenna design at 2.4 GHz, whose electrical dimensions, including the ground plane, are $lambda_{0}/25timeslambd...

The human body is an extremely challenging environment for the operation of wireless communications systems, not least because of the complex antenna-body electromagnetic interaction effects which can occur. This is further compounded by the impact of movement and the propagation characteristics of the local environment which all have an effect upo...

Body Area Network (BAN) researches include a wide range of multidisciplinary topics like antennas and propagation close to the body, Medium Access Control (MAC) and networking protocols, security and localization. Short-term solutions for BANs so far were based on already existing communication standards, but they only partially meet the specific n...

To investigate on-body channel space-time correlation characteristics in various walking scenarios, we analyze the correlation properties at 4.2 GHz between two on-body radio links with a transmitter on the heart and receivers on both hands. For that purpose, two different measurement campaigns are exploited. The results show that, depending on the...

In the recent years, with the need to develop accurate propagation models for the modern wireless systems, increasing attention has been paid to the study of so-called Diffuse Scattering. This phenomenon is traditionally associated with the presence of surface roughness, whose effect on the radio signal has been widely studied in the past. However,...

Network localization enables a variety of new applications that rely on the positional information of nodes. High-accuracy network localization is challenging in harsh propagation environments (such as indoor) and is limited by power emission constraints. We devise non-regenerative ultra-wideband relaying to improve the performance of network local...

We present herein an error model that characterizes on-body range measurements based on time of arrival (TOA) estimation in Impulse radio-ultra wideband, wireless body area networks. Considering real channel measurements over two representative on-body links for repeated walk cycles, the model is drawn as a conditional mixture, accounting for signa...