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This article implies the results of attitude determination of land vehicle with high precision GNSS signal receivers. We analyze vehicle roll angle, heading and geometric centre determination possibility and precision. There are theoretical and practical results presented in the article. In aim to implement the practical part two precise GNSS receivers were installed on the roof of a vehicle. GNSS...
In this article, we consider a service model based on network proximity and using Bluetooth. In this connection, we consider services based on the Core Bluetooth as well as services based on Bluetooth Low Energy. In particular, we present our vision on the applicability of Bluetooth Low Energy for positioning applications. This paper also provides specific models for Bluetooth network proximity based...
Name-centric approaches provide maximum flexibility for applications, as a result, the future of Internet services is heading towards the increased importance of name-centric approaches. However, for the Internet of Things to become more name-centric, implementations of resource-constrained devices are required. Although there have been advances in the Internet of Things, such as CoAP and DPWS (Devices...
High downlink and uplink speeds are achievable with the aid of LTE. Providing this technology in real life requires scheduling algorithms that will effect the concepts such as throughput and fairness. In this paper some new averaging methods for proportional fair algorithm are proposed. Simulation results show that arithmetic mean method can increase spectral efficiency and fairness performance of...
The present paper discusses the performance of 32-channel spectrum sliced wavelength division-multiplexed passive optical network (SS-WDM PON) operating at 10 Gbit/s transmission speed per channel with broadband ASE light source which is realized using two EDFA amplifiers. This paper compares performance of intensity modulated fiber optical spectrum sliced transmission system with NRZ and RZ line...
In this paper, we develop a new structure to obtain Pulse Dual Slope Modulation (PDSM) signals for visible light communication with dimming control. The modulator architecture consists of the simple blocks, including a counter, a MUX, and a serial to parallel converter. Compared to the traditional PDSM architectures, our proposed architecture has significant advantages, including RAM bit utilization...
In this paper, we analytically model the impact of clipping and quantization for optical wireless communication systems which employ direct-current biased optical orthogonal frequency division multiplexing (DCO-OFDM). Considering uniform quantization for both digital-to-analog converter (DAC) and analog-to-digital converter (ADC), analytical expression for signal-to-distortion-quantization ratio has...
Modern telecommunication networks are very complex and they should be able to deal with rapid and unpredictable changes in traffic flows. Virtual Network Topology is used to carry IP traffic over Wavelength-division multiplexing optical network. To use network resources in the most optimal way, there is a need for an algorithm, which will dynamically re-share resources among all devices in the particular...
Recent years were marked by a rapid development of mobile technologies. Contemporary mobile devices equipped with powerful processor and a variety of additional sensors open new opportunities to track user position. Crowdsourcing is a new field of research devoted to data retrieval from a crowd of users. Mobile users actively participate in collection of datasets consisting of position, power of received...
In this paper authors propose methodology to assess lifetime of fiber optic infrastructure (buried cable) based on attenuation measurements. The attenuation measurements were provided as a part of transmission line acceptance tests and then during operation and maintenance routine one year after start of service. Measurements were made on 1310nm and 1550nm wavelengths. Proposed methodology calculates...
In this paper, we propose a landing and a take-off assistance network architecture based on optical wireless technologies combining visible light communication (VLC) and free space optics (FSO). The network is composed of LED sensors that are used to collect information about the state of the runway and relay it using VLC communication to two gateways that will recover the sensed information and transmit...
Orthogonal frequency division multiplexing (OFDM) is the most promising approach to combat the frequency selective fading nature of wide-band wireless channels. On the other hand, complex field network coding (CFNC) scheme offers the advantages of better spectral efficiency and full diversity when utilized in multiuser cooperative communication systems. The efficiency of CFNC scheme in relay based...
Implementation of complexity and energy efficient Discrete Fourier Transform of the signals, reconstructed after compressive transmission by using picosecond resolution Event Timers, is described. Solutions of the earlier revealed problems complicating achieving high precision at complexity-reduced Fourier coefficient estimation by using rectangular basis functions instead of sinusoidal are suggested...
A software architecture is proposed for hybrid packet/optical data centers employing programmable NETCONF-enabled optical switching matrix, and a performance evaluation is presented comparing hybrid and electrical-only architectures for elephant flows under different traffic patterns. Network throughput and jitter are evaluated on an emulation environment, and benefits for the hybrid scenario are...
The paper compares performance of different modulation formats for 16-channel wavelength-division-multiplexed passive optical network (WDM-PON) with transmission speed of 10 Gbit/s per channel. Non return to zero (NRZ), return to zero (RZ), carrier suppressed RZ (CSRZ), duobinary (DB), NRZ differential phase shift keying (NRZ DPSK), RZ-DPSK and CSRZ-DPSK formats are compared to evaluate their performance...
Polynomial matrix singular value decomposition (PMSVD) plays a very important role in broadband multiple-input multiple-output (MIMO) systems. It can be used to decompose a broadband MIMO channel matrix in order to recover the transmitted signals corrupted by the channel interference (CI) at the receiver. In this contribution singular value decomposition (SVD) algorithm for polynomial matrices are...
The life and development of the humanity cannot be imagined without telecommunications. In fact, wireless and optical Communications play an important role for the comfort and well-being of the modern society. We have become more and more dependent on the connectivity of services and data provided over different networks. The 2-nd International scientific conference RTUWO2016 was aimed to actualize...
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