Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
To guarantee the rapidly increasing applications of electrical consumer, ultra small cells have been proposed to provide high spectral efficiency. However, which are severely constrained by the inter-cell interference (ICI) when the system load is high, and the enhanced inter-cell interference coordination (eICIC) is key to improving performance. To quantify the performance gains from eICIC to the...
Allowing Secondary Users (SUs) to access the licensed spectrum without causing harmful interference to the Primary Users (PUs) is crucial in enabling the Cognitive Radio (CR) technology. In order to increase the utilization of the spectrum bands, we propose a Dynamic Spectrum Allocation (DSA) algorithm that integrates both interweave and underlay spectrum access schemes. The proposed algorithm will...
Wireless technology has become an invaluable facilitator in many aspects of daily life. Healthcare environments in particular have gained noticeable agility and flexibility by integrating wireless functionality into various medical equipment. As of late, chipsets designed to implement communication standards in the Industrial, Scientific and Medical (ISM) band have become inexpensive and widely available,...
Given that L-band digital aeronautical communications system type 1 (LDACS1) may share the same spectrum with the legacy Distance Measuring Equipment (DME) system, DME, impulsive interference would be the main issue of this aeronautical communications system. To improve the performance of the LDACS1, a time-domain Correlative Interference Mitigation (CIM) aiming at DME impulse is proposed in this...
LMS (least mean square) and the SMI (sample matrix inversion) algorithms are presented for the interference rejection of adaptive array antennas. Interference rejection is achieved by optimally determining the array weights. LMS algorithm, which is based on the steepest-descent method, is the most common technique used for continuous adaptation. SMI algorithm based on an estimate of the correlation...
In this work, we present a tool to construct and visualize the spatio-temporal variations of power. A dataset of real-world power measurements is collected over a geographical area of interest. Relevant parameters of the environment such as the path loss exponent and the decorrelation time of the lognormal shadow fading are extracted from the dataset. Also, the average powers measured at a finite...
Several interference mitigation schemes have been recently proposed in literature to cope with multiple collocated Body Area Networks. Nevertheless, an in-depth analysis of the underlying coexistence issues and challenges is still needed so as to support and guide even more efficient system design. In this paper, we rely on realistic Body-to-Body channel models, to valuate the impact of mutual interference...
Advanced method of inner calibration of individual receive modules of active phased antenna arrays (APAA) in synthetic aperture radar (SAR) is discussed. This method allows fast and accuracy amplitude and phase characterization of every receive modules and uses pseudo-noise sequences as core of calibrating sequences system. Decorrelation method of cancelling mutual interference using simple matrix...
In this paper, a work has been carried out to analyse the performance of cognitive radio (CR) users where secondary user (SU) adapts its transmit power according to an activity model of primary user (PU). The performance has been measured in terms of the outage probability of PU and SU where SU is working in spectrum underlay mode. While PU is present in the network, SU's instantaneous transmitting...
Large-scale multiple input multiple output (MIMO) has a high spectral and energy efficiency and is considered as the promising technique for future 5G wireless communications. In practice, the accurate knowledge of channel state information (CSI) is of great importance to guarantee the performance of MIMO systems. However, the conventional training sequence (TS) based approaches usually suffer from...
This paper proposes a channel estimation algorithm for the High Speed Uplink Packet Access (HSUPA) system supporting the 64-QAM modulation and operating in a high Signal-to-Interference and Noise Ratio (SINR) regime. The algorithm is aimed to overcome limitations of the conventional approach which is based on simple correlation of the received signal with the pilot sequence and has insufficient performance...
This work focuses on the power minimization problem while ensuring target rates in the downlink of a multi-cell multi-user MIMO system wherein L base stations (BSs) of N antennas serve in total K single-antenna user equipments. We assume that the transmit antennas at each BS are correlated and propose a decentralized solution to compute an approximation of the optimal beamforming vectors. The analysis...
The time-varying landscape of spectral congestion is driving the investigation into new forms of “spectrally aware” radar emissions based on passive sensing of the environment. The recent Pseudo-Random Optimized FMCW (PRO-FMCW) framework, which can be viewed as an instantiation of FM noise radar, generates a nonlinear FMCW waveform that does not repeat and is designed using spectrally shaped optimization...
Conditional regularized zero-forcing (CRZF) precoding for multi-cell Massive MIMO network is investigated in this paper. An effective method to calculate the tight deterministic approximations of inter-cell interference for multi-cell Massive MIMO network is proposed, and the Massive MIMO here means that the number of transmit antennas and single- antenna users in each cell tends to infinity while...
The Global Positioning System (GPS) is a worldwide service and it is used as a reference for many other time, altitude, latitude and longitude based systems. Intentional jammers can degrade the reception of GPS signals, causing the receivers to fall out of sync. The technique employed in Independent Components Analysis (ICA) provides the ability to separate the interference (jamming). In this paper,...
An accurate traffic model is a key factor in the research and design of 5G heterogeneous networks. The literature on mixture of non-uniform and uniform traffic models is very limited. The mixed traffic model includes the non-uniform UEs and uniform UEs at the same time, which represents a more realistic traffic distribution. In this paper, we give a mixed traffic model that is based on the available...
In this work the performance of the Sucessive Interference Cancelation (SIC) architecture combined with Matching Pursuit (SIC/MP) and Least Squares (SIC/LS) algorithms is statistically analyzed when they are used to mitigate multipath effect in an Acoustic Local Positioning System (ALPS). The experiments are carried out with sets of two hundred real signals acquired in positions where there exists...
Military communications face increasingly congested environments requiring spectrally efficient approaches capable of contending with many users and interference. We evaluate the over-the-air performance of recently designed minimum total squared correlation (MinTSC) signature sets compared to maximal length pseudorandom binary spreading sequences (m/PN) under a variety of interference conditions...
In this paper, we consider the low probability of intercept (LPI) property of the binary Sidel'nikov sequences. We derive the LPI property of the sequences by deriving the triple autocorrelation bound of the binary Sidel'nikov sequences. The derived bound is approximately twice of square root of the period of the sequences, which is similar to that of the binary Legendre sequences.
In this work it is introduced a scheme to reduce the effects of a differential GPS signal when acting as interference in narrowband powerline communications systems. The novelty is the use of specific cyclostationary characteristics of the interfering signal for its cancellation. A robust detection method (the forward consecutive mean excision algorithm) is used to define if the interfering signal...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.