The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This work presents two-rank (Wi-Fi and LTE) analytical model, from which we can evaluate the goodput of vehicular wireless network depending on the number of vehicles N in the access point (AP) coverage area. To evaluate the suitability of the model used, experimental data are compared with the theoretically calculated data. The results obtained allow us to evaluate the performance of each individual...
This paper investigates the leakage rate based hybrid untrustworthy relay selection strategy. The investigation considers a dual-hop multiple half/full-duplex untrustworthy bidirectional amplify-and-forward wireless relaying network in the system model. The investigation also considers that the untrustworthy relay terminals are under the effect of a finite number of friendly jammers' interference...
In this research, authors propose approach to assess lifetime of fiber optic infrastructure (buried cable) based on measurements of chromatic dispersion (CD) and polarization mode dispersion (PMD). The initial dispersion measurements were made right after cable installation then approximately three months (4440 hours) later before start of service, and then repeated measurements in two and a half...
In this paper, we propose a multi-hop multi-branch multiple-input multiple-output (MIMO) SSK scheme with path selection and investigate its error performance. In this scheme, the best path is selected among multiple branches and a multiple-antenna source (S) communicates with a multiple-antenna destination (D) via the relays of the selected path. Each relay is equipped with multiple transmit and receive...
Radio-over-fiber is a key-enabling-technology for next generation wireless networks. To support an increasing number of antennas, a CloudRAN approach that maximally aggregates base station functionality of the different antenna sites is the most economically feasible. To support light weight antenna units, analog radio-over-fiber is most promising. To mitigate linearity constraints of optical modulators,...
An approach to significant widening the bandwidth of the input signals at their digitizing, pulse width modulated compressed transmission and reconstruction is explored. Alias-free digitizing of wide bandwidth input signals is performed by deliberate randomization of signal sampling and innovative Analog-to-Event conversion technique is used for width modulation of the transmitted pulses. Precise...
The paper presents the development and implementation of a Digital Signal Processing algorithm for the Speed Indication Display with a 24 GHz continuous wave Doppler radar. The algorithm is based on a well-known zerocrossing algorithm and filtering. This paper is focused on implementing this algorithm into a widely used microcontroller, which is usually mounted on the Arduino Uno board. MATLAB/Simulink...
Filter bank multicarrier (FBMC) has been taken as a candidate modulation for the 5th generation (5G) mobile network, because it exploits well-shaped prototype filters to reduce the inter-symbol-interference (ISI) and inter-carrier-interference (ICI) in OFDM system. To achieve more flexibility in filter performances, this paper designs nearly perfect reconstruction (NPR) filters by relaxing the Nyquist...
Ultra-reliable and low latency communications is envisioned to enable new services and applications with high reliability, availability and low latency, e.g, factory automation, Tactile Internet. Device-to-device communication is one such mean that allows devices to experience benefits in terms of shorter communication latency. Currently most device-to-device communication in frequency-division duplex...
Smart optimisation of radio resource distribution techniques is crucial in improving the overall performance of Next-Generation Networks (NGNs). Since higher data rates, lower latency and increased fairness for users are the main goals, an efficient scheduling algorithm has to be used. In this paper an evaluation of the performance of an indoor network is realised using the Realistic Indoor Environment...
In this article a brief description of a direct conversion receiver is given, sources of affected channels in such a receiver are examined. Practical methods for eliminating of affected channels of a real radio system are proposed.
This paper presents an new approach to noise reduction for voice communication over Bluetooth technology. In the literature, several authors have compared the performance of different filtering techniques, such as the well-known Spectral Subtraction (SS), and Wiener Filter (WF) using simulated data, whereas this research uses real-time data samples collected from cars subjected to a noisy environment...
Cooperative intelligent transportation systems have become an active topic with the introduction of smart communications between vehicles, increasing driver safety, traffic efficiency and ultimately paving way for autonomous vehicles. These vehicular communications have stringent transmission requirements. Among various proposed communication protocols, use of heterogeneous networks, combining long...
Cloud radio access network (C-RAN) has been shown to reduce both capital and operating expenditures and provide high spectral efficiency (SE) and energy efficiency (EE). High density of remote radio heads (RRHs) deployments results in inefficient energy consumption. Moreover improvements in the battery capacity of mobile devices lag far behind the surging demand for transmit power, which makes power...
We study outage performance of a downlink multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) in dual hop amplify-and-forward (AF) relay communication system over frequency non-selective and slow fading channels with Nakagami-m distribution. In the network, the base station (BS) and mobile users equipped by multiantenna communicate by the help of fixed gain AF relay with single...
This paper presents a new method of smart waste city management which makes the environment of the city clean with a low cost. In this approach, the sensor model detects, measures, and transmits waste volume data over the Internet. The collected data including trash bin's geolocation and the serial number is processed by using regression, classification and graph theory. Thenceforth a new method is...
In this work, a relay-selection scheme is proposed for underlay cognitive radio networks, with fixed and adaptive relaying power. The relay-selection and power allocation is based on the calculation of the log-likelihood ratio (LLR) value, calculated at each of the relay nodes available in the secondary network. No interference is caused to the primary network, through the satisfaction of a low power...
This paper studies the impact of various parameters used for modeling indoor VLC channels, considering a mobile user within the confined environment. The main investigated parameters are either physical or geometrical. First, we classically study the impact of optical properties of surface materials. Then, the effect due to the presence of the user body inducing various VLC receiver orientations is...
Currently the world is experiencing a fast evolution of modern communication and information technologies due to infrastructure development. Consequently, there is a growing need to be able to quickly and resource-efficiently receive, transmit and process information, monitor different physical processes, environment. For this purpose, optical communication systems and optical fiber sensors are directly...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.