The upcoming fifth generation (5G) of wireless networks is expected to lay a foundation intelligent with the provision some isolated artificial intelligence (AI) operations. However, fully network orchestration and management for providing innovative services will only be realized in Beyond 5G (B5G) networks. To this end, we envisage that sixth (6G) driven by on-demand self-reconfiguration ensure many-fold increase performance service types. increasingly stringent requirements emerging may...

Efficient and realistic mm-wave channel models are of vital importance for the development novel wireless technologies. Though many current 60 GHz based on useful concept multipath clusters, only a limited number measurements have been reported in literature this purpose. Therefore, there is still need further measurement analyses clustering band. This paper presents results double-directional MIMO model. Based these results, we derive model which validated with measured data. Statistical...

Physical layer security (PLS) has been extensively explored as an alternative to conventional cryptographic schemes for securing wireless links. Many studies have shown that the cooperation between legitimate nodes of a network can significantly enhance their secret communications performance, relative noncooperative case. Motivated by importance this class PLS systems, paper provides comprehensive survey recent works on cooperative relaying and jamming techniques transmissions against...

The results of three ultra-wideband (UWB) measurement campaigns conducted in two different industrial environments are presented. A frequency range 3.1-10.6 or 3.1-5.5 GHz was measured using a vector network analyzer and virtual array technique enabling the investigation small-scale statistics. show that energy arrives clusters, abundance metallic scatterers present factory hall causes dense multipath scattering. latter produces fading is mostly Rayleigh distributed; only exception being...

Vehicular communications essentially support automotive applications for safety and infotainment. For this reason, industry leaders envision an enhanced role vehicular in the fifth generation of mobile technology. Over years, number vehicle- mounted sensors has increased steadily, which potentially leads to more volume critical data a short time. Also, emerging such as remote/autonomous driving infotainment high-definition movie streaming require data-rates on order multiple Gb/s. Such high...

In this paper, we present a statistical model for the ultra-wideband (UWB) channel in an industrial environment. Based on set of measurements factory hall, find that abundance metallic scatterers causes dense multipath scattering. This can be seen to produce mostly Rayleigh distributed small-scale fading signal, with only few paths exhibiting Nakagami distributions. For power delay profile, suggest generalization Saleh-Valenzuela where clusters different excess delays have ray decay...

We address the main technical challenge encountered in practical implementations of full-duplex MIMO relays, i.e., how to mitigate efficiently self-interference that loops back from relays transmit antenna array its receive array. In particular, we consider spatial-domain suppression using optimal eigenbeamforming minimizes power residual signal by pointing and beams minimum eigenmodes channel. As a special case, scheme covers also null-space projection approach discussed earlier papers. To...

Sensor networks and ad-hoc networks, where nodes inter-communicate without fixed infrastructure, have recently attracted interest due to potential use in industrial, environmental, safety-related applications. The fading statistics of the propagation channels between sensor are essential determine possible data rate, outage, latency networks. This paper presents (to best our knowledge) first in-depth analysis, based on measurements, typical node locations office environments. We find that...

In this paper, we present the (to our knowledge) first measurement results for ultra-wideband channels in industrial environments, i.e., a factory hall. The measurements are done with virtual arrays, which allows analysis of small-scale fading statistics, as well directional analysis. We find that there is dense multipath scattering due to abundance metallic scatterers considered environment. Multiple scatterer clusters can be identified both delay and angular domain. Typical rms spreads lie...

This paper presents a joint clustering-and-tracking framework to identify time-variant cluster parameters for geometry-based stochastic MIMO channel models. The method uses Kalman filter tracking and predicting positions, novel consistent initial guess procedure that accounts predicted centroids, the well-known KPowerMeans algorithm identification. We tested by applying it two different sets of measurement data, indoor measurements conducted at 2.55 GHz outdoor 300 MHz. results from our...

Beamforming is an important feature of 60 GHz communications. We present analysis the influence beamforming in indoor ultrawideband radio channels measured mm-wave band. The performance narrowband and wideband direction-based beamformers investigated terms improving channel metrics such as delay spread, excess delay, signal-to-noise ratio (SNR). compared with dominant eigenmode transmission statistical beamforming. Our reveals that line-of-sight (LOS) scenarios, two have a similar approaches...

This letter addresses physical layer security (PLS) for a wireless sensor network, in which multiple nodes communicate with single sink the presence of an eavesdropper. Under assumption using outdated channel state information (CSI) eavesdropper link, outage probability achievable secrecy rate under Weibull fading is investigated and its analytical expressions are derived. Specifically, we consider scheduling to enhance PLS, thereby, quantify degradation due CSI best-node scheme compare it...

Energy harvesting relaying is predicted to play a pivotal role in large-scale energy constrained networks. This letter evaluates the secrecy performance of system that employs three-step two-way decode-and-forward relay with capability. More specifically, we derive closed-form expression for eavesdropping probability when main and wiretap links experience independent κ - μ shadowed fading. We evaluate impact fading parameters, power splitting factor at relay, on performance. Our results...

Research efforts in vehicular communication networks have been driven by the need to achieve high data rates for value-added services and safety applications. The proliferation of billions connected devices along with their ever growing demands can potentially cause severe congestion unless effective solutions are developed. In this context, multiuser interference encountered ad hoc is a major performance bottleneck. among vehicles needs be harnessed meet rate requirements heterogeneous...

The outdoor-to-indoor wireless propagation channel is of interest for cellular and local area network applications. This paper presents the measurement results analysis based on our multiple-input-multiple-output (MIMO) campaign, which one first to characterize channel. measurements were performed at 5.2 GHz; receiver was placed indoors 53 different locations in an office building, transmitter three "base station" positions a nearby rooftop. We report root-mean-square (RMS) angular spread,...

This paper compares the capacity improvement capability of spatial multiplexing and beamforming techniques for 60 GHz transmissions in a multi-carrier radio system such as orthogonal frequency division multiplexing. The term this refers to conventional gain focusing, strongest propagation path, by narrow antenna beams. Our channel metric depends only on multipath richness aperture size, but is otherwise independent realization elements aperture. analysis also reveals degrees-of-freedom...

Physical layer security (PLS) techniques hold promise for augmenting secure communications in the 5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> generation of mobile wireless networks. Secret key (SKG) is a PLS technique which exploits propagation channel's randomness to generate symmetric bits information encryption and decryption. This work proposes based on non-uniform quantization received signal strength (RSS) samples...

Directional properties of the radio channel are high importance for development reliable wireless systems operating in 60 GHz frequency band. Using transfer functions measured from 61 to 65 a conference room we have extracted estimates multi-path component parameters using SAGE algorithm. In paper compare results line-of-sight (LOS) scenarios and corresponding non-line-of-sight (NLOS) present values direction spread at Tx Rx.

With the ubiquitous use of smartphones and other connected pieces equipment, number devices to Internet is exponentially growing. This will test efficiency envisioned 5G network architectures for data acquisition its storage. It a common observation that communication between smart typically influenced by their social relationship. suggests theory networks can be leveraged improve quality service such links. In fact, networking concepts centrality community have been investigated an...

In this paper we study the influence of phase noise from free-running local oscillators on SAGE signal parameter estimation. Phase is here modeled as a random-walk process. We present estimates our LUND RUSK MIMO channel sounder, and draw conclusions requirements oscillators' in terms Allan variance. investigate an error propagation effect SAGE, finally, capacity.

In this paper, we present a statistical evaluation of an outdoor-to-indoor multiple-input multiple-output (MIMO) measurement campaign performed at 5.2 GHz. 159 locations in office building are analyzed. Our analysis pays special attention to two key assumptions that widely used stochastic channel models. An assumption is practically every model the can be represented as sum line-of-sight (LOS) component plus (possibly correlated) zero-mean complex Gaussian distribution. investigation shows...

This paper presents the results of one first measurement campaigns for double-directional characterization outdoor to indoor wireless propagation channels. Such channels play a vital role cellular systems with multiple antenna elements at transmitter and receiver, i.e. multiple-input multiple-output (MIMO) systems. Measurements were performed 5.2 GHz between 53 different receiver locations in an office building, three "base station" positions on nearby rooftop. In paper, we present...

In this paper, we present a cluster based analysis of an outdoor-to-indoor Multiple-Input Multiple-Output (MIMO) measurement campaign, and extract model parameters for the COST273 channel model. The measurements were performed at 5.2 GHz 159 locations in office building. Multipath component (MPC) have been extracted these positions using high-resolution algorithm. We analyze clustering MPCs, i.e., grouping together MPCs with similar DOAs, DODs, delays. compare identification by visual...