Physical (PHY) layer security approaches for wireless communications can prevent eavesdropping without upper data encryption. However, they are hampered by channel conditions: absent feedback, typically feasible only when the source-destination is better than source-eavesdropper channel. Node cooperation a means to overcome this challenge and improve performance of secure communications. This paper addresses one pair with help multiple cooperating relays in presence or more eavesdroppers....

Sharing of the frequency bands between radar and communication systems has attracted substantial attention, as it can avoid under-utilization otherwise permanently allocated spectral resources, thus improving efficiency. Further, there is increasing demand for that share hardware platform well band, this not only decongests spectrum, but also benefits both sensing signaling operations via full cooperation functionalities. Nevertheless, success spectrum sharing critically depends on...

We focus on a dual-functional multi-input-multi-output (MIMO) radar-communication (RadCom) system, where single transmitter communicates with downlink cellular users and detects radar targets simultaneously. Several design criteria are considered for minimizing the multi-user interference. First, we consider both omnidirectional directional beampattern problems, closed-form globally optimal solutions obtained. Based these waveforms, further weighted optimization to enable flexible trade-off...

Joint communication and radar sensing (JCR) represents an emerging research field aiming to integrate the above two functionalities into a single system, sharing majority of hardware signal processing modules and, in typical case, transmitted signal. It is recognised as key approach significantly improving spectrum efficiency, reducing device size, cost power consumption, performance thanks potential close cooperation functions. Advanced techniques are critical for making integration...

We consider a cooperative wireless network in the presence of one more eavesdroppers, and exploit node cooperation for achieving physical (PHY) layer based security. Two different schemes are considered. In first scheme, cooperating nodes retransmit weighted version source signal decode-and-forward (DF) fashion. second while is transmitting, transmit noise to confound eavesdropper (cooperative jamming (CJ)). investigate two objectives, i.e., maximization achievable secrecy rate subject total...

Important requirements for automotive radar are high resolution, low hardware cost, and small size. Multiple-input, multiple-output (MIMO) technology has been receiving considerable attention from manufacturers because it can achieve a angular resolution with relatively numbers of antennas. For that ability, exploited in the current-generation advanced driverassistance systems (ADAS) as well next-generation highresolution imaging autonomous driving. This article reviews MIMO basics,...

This paper studies secrecy rate optimization in a wireless network with single-antenna source, multi-antenna destination and eavesdropper. is an unfavorable scenario for performance as the system interference-limited. In literature, assuming that receiver operates half duplex (HD) mode, aforementioned problem has been addressed via use of cooperating nodes who act jammers to confound investigates alternative solution, which assumes availability full (FD) receiver. particular, while receiving...

Recently proposed multiple input output radars based on matrix completion (MIMO-MC) employ sparse sampling to reduce the amount of data that need be forwarded radar fusion center, and as such enable savings in communication power bandwidth. This paper proposes designs optimize sharing spectrum between a MIMO-MC system, so latter interferes minimally with former. First, system transmit covariance is designed minimize effective interference (EIP) receiver, while maintaining certain average...

A MIMO radar system is proposed for obtaining angle and Doppler information on potential targets. Transmitters receivers are nodes of a small scale wireless network assumed to be randomly scattered disk. The transmit uncorrelated waveforms. Each receive node applies compressive sampling the received signal obtain number samples, which subsequently forwards fusion center. Assuming that targets sparsely located in angle- space, based samples forwarded by center formulates an l1-optimization...

Widely distributed multiple radar architectures offer parameter estimation improvement for target localization. For a large number of radars, the achievable localization minimum mean-square error (MSE), with full resource allocation, may extend beyond predetermined system performance goals. In this paper, driven allocation schemes systems are proposed. All available antennas used in process. predefined MSE threshold, total transmitted energy is minimized such that objective met, while...

Beamforming is an effective means to improve the quality of received signals in multiuser multiple-input-single-output (MISO) systems. Traditionally, finding optimal beamforming solution relies on iterative algorithms, which introduces high computational delay and thus not suitable for real-time implementation. In this paper, we propose a deep learning framework optimization downlink beamforming. particular, obtained based convolutional neural networks exploitation expert knowledge, such as...

The paper proposes a cooperative scheme for the coexistence of multiple-input-multiple-output (MIMO) communication system and matrix completion (MC) based, collocated MIMO (MIMO-MC) radar. To facilitate coexistence, also deal with clutter, both radar systems use transmit precoding. For waveform flexibility, uses random unitary matrix. We prove that such waveforms any precoding matrix, error performance MC is guaranteed. precoder, subsampling scheme, covariance are jointly designed in order...

Integrated sensing and communication (ISAC) has recently emerged as a candidate 6G technology, aiming to unify the two key operations of future network in spectrum/energy/cost-efficient way. ISAC systems communicate sense for targets using common waveform, hardware platform, ultimately same infrastructure. Nevertheless, inclusion information signaling probing waveform target raises challenges from perspective security. At time, capability incorporated transmission offers unique opportunities...

Radar and communications (R&C) as key utilities of electromagnetic (EM) waves have fundamentally shaped human society triggered the modern information age. Although R&C been historically progressing separately, in recent decades they converging towards integration, forming integrated sensing communication (ISAC) systems, giving rise to new, highly desirable capabilities next-generation wireless networks future radars. To better understand essence ISAC, this paper provides a systematic...

Widely distributed multiple radar architectures offer parameter estimation improvement for target localization. For a large number of radars, with full resource allocation, the achievable localization minimum mean-square error (MSE) may extend beyond system predetermined performance goals. In this paper, driven allocation schemes systems are proposed. Two operational policies considered. first, transmit and receive antennas employed in process is minimized by effectively selecting subset...

A wireless network with one source, destination, eavesdropper, and multiple decode-and-forward relays is considered. two-slot cooperative relaying scheme proposed that targets at maximizing the secrecy rate. In first slot, source transmits information bearing signal, same time, it cooperates destination in jamming eavesdropper without creating interference relay. second optimally selected relay retransmits decoded particular to jam destination. Optimal selection also optimal power allocation...

The feasibility of physical-layer-based security approaches for wireless communications in the presence one or more eavesdroppers is hampered by channel conditions. In this paper, cooperation investigated as an approach to overcome problem and improve performance secure communications. particular, a decode-and-forward (DF) based cooperative protocol considered, objective design system secrecy capacity maximization transmit power minimization. System DF-based first studied assuming...

In colocated multiple-input multiple-output (MIMO) radar using compressive sensing (CS), a receive node compresses its received signal via linear transformation, referred to as measurement matrix. The samples are subsequently forwarded fusion center, where an <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">l</i> <sub xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> -optimization problem is formulated and solved for target information. CS-based...

A Gaussian multiple-input single-output (MISO) wiretap channel model is considered, where there exists a transmitter equipped with multiple antennas, legitimate receiver and an eavesdropper, each single antenna. We study the problem of finding optimal input covariance that maximizes ergodic secrecy rate subject to power constraint, only statistical information about eavesdropper available at transmitter. This non-convex optimization in general difficult solve. Existing results address case...

Trustworthy operation of industrial control systems depends on secure and real-time code execution the embedded programmable logic controllers (PLCs). The monitor critical infrastructures, such as electric power grids healthcare platforms, continuously report back system status to human operators. We present Zeus, a contactless controller security ensure its flow integrity. Zeus leverages electromagnetic emission by PLC circuitry during programs. Zeus's tracking enables non-intrusive...

A novel dual-function radar communication (DFRC) system is proposed, that achieves high rate, and can flexibly trade-off rate for improved sensing performance. The proposed a monostatic multiple-input multiple-output (MIMO) transmits wideband, precoded, orthogonal frequency division multiplexing (OFDM) waveforms from its antennas. subcarriers are divided into two groups, i.e., shared private. On subcarrier, all antennas transmit simultaneously, while on private one only antenna at time....

The paper considers interference in a wireless communication network caused by users that share the same propagation medium. Under assumption interfering are spatially Poisson distributed and under power-law loss function, it has been shown past instantaneous amplitude at receiver is /spl alpha/-stable distributed. Past work not considered second-order statistics of relied on samples independent. In this paper, we provide analytic expressions for show depending properties users' holding...

A novel approach of blind channel estimation for orthogonal frequency-division multiplexing (OFDM) systems is proposed. linear transformation applied on each block before it enters the OFDM system. The transform imposes a correlation structure transmitted blocks, which exploited at receiver to recover via simple cross-correlation operations. proposed computationally and converges fast, makes good candidate fast-varying channels. Its performance tested analytically, through mean-square error...

We address the problem of improving spatial resolution ulrasound images through blind deconvolution. The ultrasound image formation process in RF domain can be expressed as a spatio-temporal convolution between tissue response and ultrasonic system response, plus additive noise. Convolutional components dispersive attenuation aberrations introduced by propagating object being imaged are also incorporated response. Our goal is to identify remove convolutional distortion order reconstruct thus...