We propose and evaluate the performance of time reversal technique in impulse radio ultrawideband (UWB) communications. The evaluation was based on measured channel responses a 4times1 multiple input single output (MISO) system UWB frequency bandwidth 3 to 5 GHz with both vertical horizontal polarization at receiver. results show that there is great potential combining respect reducing receiver complexity improving performance. Simultaneous communication illustrated users, each bit error...

Ultra-reliable communication (URC) is one of the distinctive features upcoming 5G wireless communication, characterized by packet error rates going down to 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-9</sup> . In this paper, we analyze tail cumulative distribution function block fading channels in regime extremely rare events, i.e., ultra-reliable (UR) operation. Our main contribution consists providing a unified framework for...

The mobile-to-mobile radio channel was investigated in different suburban outdoor-to-indoor environments. System performance parameters terms of un-encoded BER and outage probability have been extracted from hardware software TETRA simulations. In several scenarios, the measured signal envelope statistics were found to be a combination single double Rayleigh distributions. system performances obtained these scenarios general lower than reference ETSI limits.

Interference caused by other users in a multi-user environment degrades the system performance significantly. Conventionally, user separation is achieved signal time, frequency or code. The use of multiple elements antenna (MEA) systems can apply space targeting transmitted power to interest. Inevitably that case, not ideal and there interference on systems. Moreover wideband transmission, selective fading causing inter symbol (ISI) big challenge for point wireless communications. In this...

The authors describe cross-correlation properties for compact urban base station antenna configurations, nearly all of which result in very low envelope coefficients about 0.1 to 0.3. Specifically, polarization diversity systems are examined their potential improving link quality when hand-held terminals involved. An expression is given the correlation function compound space and systems. Dispersion dynamic statistics presented measured environments. For microcell applications, it found that...

Both massive multiple-input multiple-output (MIMO) technology and use of frequencies in the range 24-100 GHz are considered essential for upcoming 5G systems. Measurements new type channels needed, but this is challenging due to large number MIMO short wavelength (so-called mmWave channels). This article describes a sounder system capable measurements both types channels. While same supports simultaneous channels, each band total practice limited. For 300-6000 MHz alone, arrays with up 128...

Path-loss in urban area small and microcell environments is discussed. Results from dual-frequency measurements performed areas at 955 MHz 1845 are presented. The mean difference path loss between the two frequencies was found to be 10 dB, whereas free-space only 6 dB. shadow-fading highly correlated. Therefore much of experience 900-MHz band can used for planning new cellular systems 1800-2000-MHz band. M. Hata's (1980) prediction model fitted data both frequencies, but predicted too-low...

Typical DECT and UMTS radio environments have been investigated with high gain directional base station (BS) antennas. Experiments performed as preparation for field tests an adaptive BS antenna testbed. The dispersion of the environment leads to a distortion perceived sidelobe levels, though still providing increase in effective gain. spatial selectivity directive antennas reduction time by about factor two, while cross polarization discrimination is increased few dB. Quantitative measures...

A new application of utilizing ultra-wideband (UWB) technology to sense wind turbine blade deflections is introduced in this paper for energy cost reduction. The lower UWB band 3.1-5.3 GHz applied. On each blade, there will be one deflection sensing system, which consists two antennas at the root and antenna tip. detailed topology challenges system are addressed. Due complexity problem, first realize on-blade radio link simplest case, where tip situated outside (and on surface of) a To...

This paper introduces three key features in geometry-based stochastic channel models order to include massive MIMO channels. Those consists of multiuser (MU) consistency, non-stationarities across the base station array and inclusion spherical wave modelling. To ensure MU we introduce concept "user aura", which is a circle around user with radius defined according stationarity interval. The overlap between auras determines share common clusters among users. model array, sub-arrays are for...

Attaching cables to mobile terminals for accurate measurements is progressively influencing the radiation characteristics with diminishing size of terminals. Simulations show large influence and their exact curvature on properties that are small respect wavelength. These results confirmed by in an anechoic chamber. As corrections these almost irreproducible influences hardly feasible, we propose omit conducting completely. Instead, optical fibres used transparent transport RF signals....

The application of the time reversal (TR) technique in a multiple input-single output (MISO) configuration can reduce delay spread channel impulse response by factor 2-3, depending on power allocation scheme. Moreover, this provides gain about 20 dB peak signal power. These effects are demonstrated with measurements fixed wireless access channels 5 GHz band. were performed at 3 different locations downtown Toronto, and has been measured 8 element uniform linear antenna arrays both ends, thus...

This work presents novel, very-short range UWB radio channel investigations performed in typical body area network (BAN) scenarios using small size, low profile terminal antennas. A novel RF fiber optic connection has been employed for the antenna set-up order to maximize accuracy of measurements. Several test users have investigated and significant changes radiation characteristics when close human were disclosed numerical simulations. The measurements with different device positions on...

An ultra-wideband (UWB) blade deflection sensing system with a tip antenna inside is investigated in this paper. The lower UWB band of 3.1-5.3 GHz utilized. This composes two radio links between one the and antennas outside root. Blade deflections are tracked via using delay-based distance estimation triangulation. In order to build reliable links, time-domain pulse field distributions simulated optimize in-blade polarization locations root around surface. Full-blade measurements proposed...

This paper describes a simultaneous sounding technique for polarization matrix investigations in pico cell environments at 1890 MHz. The measurement is based on two transmitting signals (separated by an artificial Doppler shift of 20 Hz), and dual branch correlation sounder allowing the four individual diversity branches. Dual polarized antennas with nearly identical radiation patterns both ports are used. conducted terms cross-polarization discrimination (XPD) coefficients. effect different...

The author describes a simple method for transforming angular distributions of radio scattering area located around mobile station (MS) into direction-of-arrival (DOA) distribution at base (BS). Tractable closed form solutions circular uniform and conical (nonuniform) areas, are presented.

The lack of capacity in mobile communication systems is an increasing problem. A channel model for the use antenna arrays at base station presented. new diversity scheme, jitter diversity, suggested with a simple algorithm. technique to array and move main beam slightly avoid deep fades, giving substantial improvement fading distribution mean power. Linear 1-19 elements are applied propagation environments different scatterer spread. influence on received pattern, such as effective gain,...

In this paper we present measurements that involve two access points (APs) and user terminals, each of which is equipped with 4 antennas, in an indoor office environment. The data allow for the simultaneous characterization multiple input-multiple output (MIMO) links from APs to terminals between are, best our knowledge, first their kind. We show are impaired by body shadowing, have therefore much lower gains than direct APs. Moreover investigate statistics links, correlation. Based on these...

This communication presents a calibration method of an indoor UWB sub-band deterministic channel model by means simulated annealing. Based on the characterization at sub-bands with subset measurement locations, optimizes dielectric material parameters environment, which improves accuracy in terms path loss (L) and time dispersion (root mean square delay spread sigma <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">tau</sub> maximum excess tau...

The paper describes short range VHF-UHF radio propagation measurements performed in a forested environment using low TX/RX antenna elevations. An empirical path loss model is proposed having as parameters the frequency, heights and forest geometry. Furthermore term fading dynamics are also presented.

Wireless transmission based on cooperation promises to bring performance improvements in multi-node networks. Several cooperative schemes have appeared the literature, and most cases been assessed under simplified assumptions for channel model. Experimental data are difficult obtain because they should provide simultaneous characterization of at least three links. In this paper we present measurements that involve two access points (APs) user terminals, each which is equipped with 4...