Fifth generation (5G) and beyond communication systems open the door to millimeter wave (mmWave) frequency bands leverage extremely large operating bandwidths deliver unprecedented network capacity. These are affected by high propagation losses that severely limit achievable coverage. The simplest way address this problem would be increase number of installed mmWave base stations (BSs), at same time augmenting overall cost, power consumption, electromagnetic field (EMF) levels. As...

Large antenna arrays and millimeter- wave (mmWave) frequencies have been attracting growing attention as possible candidates to meet the high requirements of future 5G mobile networks. In view large path loss attenuation in these bands, beamforming techniques that create a beam direction user equipment are essential perform transmission. For this purpose, paper, we aim at characterizing realistic radiation patterns, motivated by need properly capture mmWave propagation behaviors understand...

In this paper, we discuss the possibility of generating high-resolution mapping urban (or extra-urban) environments by application synthetic aperture radar (SAR) processing concepts to data collected mm-wave automotive radars installed on-board commercial vehicles. The study is motivated fact that sensors are becoming an indispensable component equipment modern vehicles, being characterized low cost, good performance, and affordable processing; therefore, in future, nearly every single...

With the advent of self-driving vehicles, autonomous driving systems will have to rely on a vast number heterogeneous sensors perform dynamic perception surrounding environment. Synthetic Aperture Radar (SAR) increase resolution conventional mass-market radars by exploiting vehicle's ego-motion, requiring very accurate knowledge trajectory, usually not compatible with automotive-grade navigation systems. In this setting, radar data are typically used refine navigation-based trajectory...

This work deals with the synthesis of time-modulated arrays (TMAs) for cognitive radio systems, in which harmonic radiations arising from periodic modulation elements time-domain are exploited as independent channels multi-point-to-point communications. The descriptors advanced time-modulating sequences using sum-of-weighted cosine waveforms optimized through particle swarm optimization aim maximizing overall signal-to-interference-plus-noise ratio on receiving and increasing antenna...

Channel estimation for hybrid Multiple Input Output (MIMO) systems at Millimeter-Waves/sub-THz is a fundamental, despite challenging, prerequisite an efficient design of MIMO precoding/combining. Most works propose sequential search algorithms, e.g., Compressive Sensing (CS), that are most suited to static channels and consequently cannot apply highly dynamic scenarios such as Vehicle-to-Everything (V2X). To address the latter ones, we leverage recurrent vehicle passages novel Multi...

This paper deals with the analysis, estimation, and compensation of trajectory errors in automotive-based Synthetic Aperture Radar (SAR) systems. First all, we define geometry acquisition model received signal. We then proceed by analytically evaluating effect an error vehicle's trajectory. Based on derived model, introduce a procedure capable estimating compensating constant velocity motion leading to well-focused well-localized SAR image. The is validated using real data gathered 77 GHz...

The beam sweeping procedure estimates the beamforming directions, or beams, to be used for downlink millimeter-wave cellular transmissions an incoming user entering cell. We propose three new approaches choice of sequence by which beams are explored (the beam-search sequence), in order reduce average time find directions. proposed methods exploit a) correlation among angles departure and its nearest, already connected user, b) position both nearest user. For point a), nearest-neighbor-beam...

A new sub-6 GHz antenna array that supports slant ±45° dual-polarization multiple-input multiple-output (MIMO) communications with high interport isolation and stable radiation performance over wide scan angles bandwidths is designed. An architecturally inexpensive solution, which combines a standard truncated waveguide single-layer patterned metasurface superstrate wave manipulation capabilities, proposed. task-oriented formulation adopted to mathematically formulate the <italic...

Automotive synthetic aperture radar (SAR) systems are rapidly emerging as a candidate technological solution to enable high-resolution environment mapping for autonomous driving. Compared lidars and cameras, automotive-legacy radars can work in any weather condition without an external source of illumination, but limited either range or angular resolution. SARs offer relevant increase resolution, provided that the ego-motion platform is known along aperture. In this paper, we present results...

With the raising interest in automated driving, onboard perception systems are required to perform a wide range of functionalities, from basic emergency braking mapping surroundings. However, current automotive radars known suffer low angular/range resolution and might be unable meet high-definition by high levels automation. Synthetic Aperture Radar (SAR) allow improve angular standard radars, but their imaging performance is constrained available bandwidth. In Joint Communication Sensing...

Complex phenomena are generally modeled with sophisticated simulators that, depending on their accuracy, can be very demanding in terms of computational resources and simulation time. Their time-consuming nature, together a typically vast parameter space to explored, make simulation- based optimization often infeasible. In this work, we present method that enables the complex systems through Machine Learning (ML) techniques. We show how well-known learning algorithms able reliably emulate...

In the emerging high mobility vehicle-to-everything (V2X) communications using millimeter wave (mmWave) and sub-THz, multiple-input multiple-output (MIMO) channel estimation is an extremely challenging task. At mmWaves/sub-THz frequencies, MIMO channels exhibit few leading paths in space-time (ST) domain (i.e., directions or arrival/departure delays). Algebraic low-rank (LR) exploits ST sparsity through computation of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...

The principal element of interest concerning the use Synthetic Aperture Radar (SAR) technology in automotive scenario is possibility to synthesize an arbitrarily long array by exploiting natural motion ego-vehicle, and therefore achieve much finer spatial resolution improved detection capabilities without increasing hardware requirements terms number physical antennas. In this paper, we discuss application SAR imaging context under a theoretical experimental perspective. Experimental results...

In this letter, a 16-switched-beam lens-based antenna with coverage area of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\pm$</tex-math></inline-formula> 30° in the horizontal plane and from 0 to notation="LaTeX">$-$</tex-math></inline-formula> 20° vertical has been built tested. The intended use is as part smart repeater servicing 5G wireless communication system operating n258 band Frequency Range 2,...

An innovative massive multi-objective design procedure is proposed for the synthesis of next-generation antennas 5G base stations. The antenna problem formulated by jointly considering several contrasting requirements in terms bandwidth, directivity, half-power beamwidth, polarization, and neighbor element isolation. Towards this end, a finite-array model developed which enables simulation set adjacent elements during process. Thanks to such an approach, obtained can be directly included...

6G technology targets to revolutionize the mobility industry by revamping role of wireless connections. In this article, we draw out our vision on an intelligent, cooperative, and sustainable environment future, discussing how will positively impact services applications. The scenario in focus is a densely populated area smart connected entities that are mutually over virtual bus, which enables access extensive always up-to-date set context-sensitive information. augmented dataset functional...

In this work we describe a methodology to process the data acquired by conventional mm-wave automotive Radar form an image of static targets ahead ego-vehicle at spatial resolution several times finer than allowed physical size array. High-resolution imaging is achieved applying processing scheme typical Synthetic Aperture Radars (SAR), that exploiting forward motion synthesize aperture as long centimeters. Contrary many works in literature, where SAR expense significant increase...

Mitigation of turbulence in a Free Space Optical communication link is demonstrated using an integrated programmable optical processor. 10Gbit/s OOK signals are successfully transmitted on indoor setup emulating hundreds meters link.

Large antenna arrays have been always exploited for radar applications in order to provide very high spatial resolution, beam-forming and null-steering. These capabilities found be extremely appealing communication systems too because of their potential highly-directive beams as the best solution reduce interference increase overall capacity, allowing spectral reuse through diversity. Nowadays big challenge is not only related maximization system performance - which proven effective when...

This paper focuses on phase noise-impaired communications. An efficient Maximum A-posteriori Probability (MAP) iterative synchronization algorithm, where detection and decoding are performed separately from estimation, is proposed. approach has the following key advantages: (i) its computational complexity relatively low performance near optimal; (ii) it requires very limited statistical knowledge of noise process; (iii) enables direct use "off-the-shelf" demodulation blocks. These features...

In this paper, an innovative Minimum Mean Square Error (MMSE)-based iterative synchronization algorithm is devised for a dually-polarized wireless link, affected by phase noise and Cross-Polarization Interference (XPI), with independent transmission streams over the two polarizations. A novel perpolarization soft decision-directed receiver separate Posteriori Probability (APP)-based decoding proposed. The key idea of proposed relies on MMSE-based (master-slave) estimation followed...

In this paper, we investigate a wireless communication scenario, where polarization multiplexing is exploited to increase the spectral efficiency. Independent modems over each are considered, with links affected by phase noise and cross-polarization interference (XPI). We devise novel per-polarization soft decision-directed iterative receiver separate <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a posteriori</i> probability-based...

Abstract The main interest in using synthetic aperture radar (SAR) technology automotive scenarios is that arbitrarily long arrays can be synthesized by exploiting the natural motion of ego vehicle, enabling finer azimuth resolution and improved detection. All this achieved without increasing hardware complexity terms number physical antennas. In paper, we start discussing application SAR imaging environment from both theoretical experimental perspectives. We proceed describing an efficient...

Mitigation of turbulence in a Free Space Optical communication link is demonstrated using an integrated programmable optical processor. 10Gbit/s OOK signals are successfully transmitted on indoor setup emulating hundreds meters link.