This paper presents statistical analysis of data obtained by measuring narrowband path loss at DECT (digital enhanced cordless telecommunications) frequency (1.89 GHz) in an indoor environment. Specific goodness-of-fit tests are applied to the data. The assess whether generating source belongs a known family random variables. Results support that local path-loss distribution can be represented as Weibull or Nakagami most environments. close resemblance between such distributions and Rice...

This paper proposes and validates, in the field, an approach for position tracking that is based on Long-Term Evolution (LTE) downlink signal measurements. A setup real data live gathering used to collect LTE signals while driving a car town of Rapperswil, Switzerland. The collected are then processed extract received cell-specific reference (CRSs), which exploited estimating pseudoranges. More precisely, pseudoranges evaluated by using "ESPRIT Kalman Filter Time-of-Arrival Tracking" (EKAT)...

A finite-state Markov model is fitted to the mobile propagation channel by use of contingency tables. Narrow-band Rayleigh and Ricean fading are considered in detail, but techniques extend other types fading. Several criteria may indicate that a first-order sufficiently characterizes behavior. The parameters obtained both from theoretical analysis simulation. Functional dependence between transition probabilities steady-state found slow case.

This paper proposes a mathematical framework for evaluating the throughput of an 802.11 distributed wireless network when system allows multi-packet reception in asynchronous operating mode. Differently from previous studies on reception, which assume certain synchronization between different sources at beginning respective transmissions, this work theoretically analyzes fully scenario, where each node can access to medium completely way. More precisely, new transmission begin channel other...

This paper proposes a mathematical framework for comparing the performance of wireless networks based on IEEE 802.11 standard, employing switched-beam, directional and adaptive antennas. The analysis adopts detailed models antenna system behavior propagation environment, taking into account multipath interference. purpose this study is to determine number simultaneous communications that may be sustained by adopting advanced systems, investigate, simulation, resulting improvements, in terms...

This paper presents a novel network architecture for an integrated nanosatellite (nSAT)-5G system operating in the millimeter-wave (mmWave) domain. The is realized adopting delay/disruption tolerant networking (DTN) approach allowing end users to adopt standard devices. A buffer aware contact graph routing algorithm designed account occupancy of nSATs and connection planning derived from their visibility periods. At terrestrial uplink, coded random access employed realize high-capacity...

Formal methods (FM) are mathematically-based techniques that provide a rigorous basis for software development: the application of FMs makes it possible to achieve provable correctness and reliability in various steps system design implementation. This article is tutorial presentation formal description address modeling analysis distributed systems concurrent processes telecommunications protocol engineering. The aim introduce non-practitioners main communication protocols. For each method,...

This paper proposes an algorithm for the estimation and tracking of direct path (DP) time arrival (TOA) signals received from 4G long term evolution (LTE) cellular base stations (BSs) in a mobile multipath environment. is important TOA-based ranging measurements, which may be exploited positioning applications. A sub-space approach used arrival, state-space path. The developed framework applied to real LTE collected using portable experimental setup during car drive town Rapperswil,...

This paper investigates the properties of a method for obtaining Markov models unspecified order to be applied narrow-band fading channels with additive white Gaussian noise. The are obtained by applying context tree pruning algorithm experimental or simulated sequences. Fading environments identified in which extension from first-order higher is justified. presents, as examples, evaluation covariance function and packet error distribution.

We have used x-ray photoelectron spectroscopy and multiple internal reflection infrared to study the etching of polysiloxane films in an rf oxygen plasma. The results indicate that a structurally strained SiO2 layer, ∼1 nm thick, is formed on film exposed For given power input this oxidized overlayer recedes with front steady state fashion, acting as protective layer for underlying film. mechanism effectively combination two competitive processes, namely, ion sputtering oxidation.

This paper presents an experiment using real Long-Term Evolution (LTE) signals to extend positioning from outdoors indoors. LTE are of interest for applications because their availability indoors, where GNSS signal reception is limited. Different approaches time arrival (TOA) extraction evaluated performance, combined with extended Kalman filter (EKF) movement tracking. The shows that the performance surprisingly good, high visibility cellular even in difficult indoor test environment, and a...

This paper presents a theoretical analysis for estimating the coverage probability in two-dimensional (2D) and three-dimensional (3D) peer-to-peer (P2P) millimeter-wave (mmWave) wireless networks.The is carried out by adopting suitable link state models realistic propagation conditions, involving path-loss attenuation, angular dispersion, mid-and small-scale fading, which comply with recent channel measurements.The presented framework accounts detail actual shape of transmitting/receiving...

One of the main targets forthcoming fifth-generation (5G) cellular network will be support communications for billions sensors and actuators, so as to finally realize Internet things (IoT) paradigm. This pervasive scenario unavoidably requires design cheap antenna systems with beamforming capabilities compensating strong attenuations that characterize millimeter-wave (mmWave) channel. To address this issue, paper proposes an iterative algorithm sparse arrays enables derive number elements,...

This paper discusses the design requirements for enabling multiple simultaneous peer-to-peer communications in IEEE 802.11 asynchronous networks presence of adaptive antenna arrays, and proposes two novel access schemes to realize multipacket communication (MPC). Both presented solutions, which rely on information acquired by each node during monitoring network activity, are suitable distributed heterogeneous scenarios, where nodes equipped with different systems can coexist. The first...

Focus of this letter is the oldest class codes that can approach Shannon limit quite closely, i.e., low-density parity-check (LDPC) codes, and two mathematical tools make their design an easier job under appropriate assumptions. In particular, we present a simple algorithmic method to estimate threshold for regular irregular LDPC on memoryless binary-input continuous-output additive white Gaussian noise (AWGN) channels with sum-product decoding, and, determine how close are obtained...

The performance of the widely adopted slotted Aloha (SA) scheme has been recently improved thanks to introduction novel mechanisms, including interference cancellation (IC), packet segmentation, and slot slicing. combined effect these mechanisms in presence capture however not yet deeply investigated, even if resulting impact on network behavior is determinant for properly quantifying achievable throughput. To deal with this issue, paper analyzes influence a framed SA (FSA) system adopting...

This paper presents an iterative algorithm for the synthesis of three-dimensional (3D) radiation pattern generated by antenna array arbitrary geometry. The is conceived to operate in fifth-generation (5G) millimeter-wave scenarios, thus enabling support multi-user mobile streaming and massive peer-to-peer communications, which require possibility synthesize 3D patterns with wide null regions multiple main beams. Moreover, proposed solution adopts a phase-only control approach reduce...

This letter presents a more accurate mathematical analysis, with respect to the one performed in Chung et al.'s 2001 paper, of belief-propagation decoding for low-density parity-check (LDPC) codes on memoryless binary input-additive white Gaussian noise channels, when considering approximation (GA) message densities under density evolution. The recurrent sequence, defined describing passing between variable and check nodes follows from GA approach involves function φ(x), therein defined, its...

This paper presents a mathematical framework for including the angular domain beside radial one in theoretical modeling of wireless networks, which spatial reuse enables coexistence multiple single-hop peer-to-peer communications inside finite region. The proposed model analyzes scenario where transmitting sources are uniformly distributed over disk and subjected to path-loss attenuation multipath-fading, considering actual location each destination its antenna system. Different from most...

The authors propose an analytical method, based on the sphere-packing bound, which can be used to assess achievable performance of transmission techniques, adopting efficient block codes, over nonideally interleaved fading channels. proposed is not subject union bound drawbacks, represents a suitable tool for gaining insights into effects impairments system performance. method investigate codes and correlated channels, benefits channel interleaver, study diversity, evaluate some hybrid...

In this letter, we propose and compare some design criteria for the search of good rate-compatible systematic turbo codes (RCPTC) families. The considerations presented by Benedetto et al. to find "best" component encoders turbo-code construction are extended puncturing patterns leading with promising performances.

The Space-Time Shift Keying (STSK) framework subsumes diverse Multiple-Input Multiple-Output (MIMO) schemes, offering a near-capacity performance at reduced complexity. STSK system's crucially depends on the dispersion matrix (DM) set used for encoding transmitted symbols. We introduce novel criterion, based EXtrinsic Information Transfer (EXIT) chart analysis, selecting capacity-approaching sets from candidate DMs, and Genetic Algorithm (GA) efficiently exploring search space formed by DM...

Since irregular low-density parity-check (LDPC) codes are known to perform better than regular ones, and exhibit, like them, the so-called 'threshold phenomenon', this Letter investigates a low-complexity upper bound on belief-propagation decoding thresholds for class of memoryless binary input additive white Gaussian noise channels, with sum-product decoding. A simplified analysis algorithm is used, i.e. consider approximation message densities under density evolution, simple algorithmic...

The performance of a Space-Time Shift Keying (STSK) scheme was shown to degrade in frequency-selective fading channels. Hence, we propose Orthogonal Frequency Division Multiplexing (OFDM) combined with STSK for broadband Furthermore, consider both an uncoded and near-capacity coded scenario. Our results show that system OFDM is capable overcoming the impairments dispersive channels, hence approaching same as flat- channel.