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In large scale Wireless Sensor Networks (WSNs), the random deployment of the sensor nodes does not guarantee the desired level of the area coverage especially when the network is sparse. One of the solutions to overcome this problem is to use a mobile robot that is equipped with, in addition to the sensing unit, an actuator unit that controls its movement. In this case, the mobile robot is considered...
Direct Device-to-Device (D2D) communication permits to offload the network, increase the capacity, and extend the cellular coverage. In D2D systems, user equipments (UEs) do not necessarily communicate via evolved Node Base station (eNB); instead, they are allowed to communicate directly with each other. This underlying communication generates interference due to reusing the same resources of the...
This paper is devoted to analysis of the requirements to local ship positioning system parameters in relation of sea wave influence. Basic operation principles of the system operation are described. Also the affecting of sea waves on vessel position is discussed. It is shown; the update frequency of position data and the single measurement duration, both are the most significant parameters in scope...
In order to meet various requirements of the 5th generation (5G) communication system, larger amounts of spectrum are required. Television White Space (TVWS) and Licensed-Assisted Access (LAA) can only utilize the specific frequency band as shared frequency and have no mechanism for sharing the other frequency bands to obtain more frequency resources. We have proposed a dynamic frequency-sharing system...
This paper is dedicated to the investigation of the influence of different waveforms on the efficiency of radio frequency (RF) to direct current (DC) conversion in wireless power transfer (WPT) systems. Single-tone, multi-tone, random and chaotic signals are used and compared as waveforms for wireless power transfer. The influence of peak-to-average power ratio (PAPR) and average input power of the...
In this paper, we propose a cooperative relaying scheme combining space shift keying (SSK) and transmit antenna selection (TAS), and investigate its error performance. In this scheme, source TAS is performed based on the channel fading coefficients corresponding to source-destination, source-relay and relay-destination links. SSK is applied by using the selected antennas. Moreover, a single-antenna...
Massive MIMO is a key technology for achieving everincreasing demands in high quality communication and navigation. At the same time multipath transmission in conjunction with transmit/receive signal combining being its corner stone can be incapable to exploit available spatial diversity. Hence it is vital to understand to which extent the parameters of the MIMO system can be optimized in order to...
The present paper has considered multithreshold decoders for self-orthogonal codes providing a near-optimal efficiency of the error correction under linear computational complexity. New divergence principle used within construction and decoding convolutional codes has been discussed. The paper has shown that usage of such principle allows significantly approximating an area of the decoder effective...
This paper describes the design and measurement results of a high speed optical avalanche photodiode (APD) receiver produced in a standard BiCMOS process. The receiver is intended to be used in an optical wireless communication scenario and therefore has a large-area photodiode, high dynamic range and a dc photocurrent rejection loop. The receiver reaches the sensitivity of −31.8 dBm at 1 Gbit/s and...
Interference in frequency-selective multiple-input multiple-output (MIMO) systems can be removed by applying a block-transmission description based on spatio-temporal vector coding and using singular value decomposition (SVD). In this contribution a newly developed SVD algorithm for polynomial matrices (PMSVD) is analyzed and compared to the commonly used SVD-based MIMO equalization. Since the PMSVD...
This paper shows how to estimate an extended polynomial matrix description of a non-linear MIMO system. Both linear and non-linear impulse responses are obtained by transmitting pseudo random binary sequence (PRBS) test-patterns and can be easily separated thanks to the shift-and-add property of PRBS. Further on, a method to equalize such nonlinear systems based on this extended polynomial matrix...
Gain clamping performance in an L-Band EDFA based on a lasing structure using a symmetrical narrowband FBG couple, has been analyzed experimentally. By optimizing the peak reflection wavelength of the FBG, a high clamped gain (over 27 dB) was obtained with a 0.1 dB ripple and an ∼ 25 dB dynamic range at 1585 nm.
In this paper, a novel design of frequency independent nano-antennas is introduced. The design described in this work consists of two arms spiral nano-antenna placed on a glass substrate. Full systematic analysis is carried out where the antenna impedance, return loss, field confinement are calculated using FDTD. In addition, studies show the power absorption of the antenna to calculate its harvesting...
The implementation of channel estimation procedures in modern wireless networks exposes them to the risk of pilot contamination attacks. To protect the system from such types of malicious intervention, a recently proposed method, based on legitimate pilots from shifted constellations, can be applied. In this paper, the detection capability of this method is studied in both the presence and absence...
The multiple-input multiple-output (MIMO) concept is of high interest in fiber-optic communication since it is able to overcome the capacity limits of current transmission systems. In this work different receiver-side interference compensation techniques are studied in a spatially multiplexed fiber-optic transmission through 0.5 km multi-mode fiber with a gross bit-rate of 5 Gbps using intensity modulation...
Meeting the ever-growing information rate demands has become of utmost importance for optical communication systems. However, it has proven to be a challenging task due to the presence of Kerr effects, which have largely been regarded as a major bottleneck for enhancing the achievable information rates in modern optical communications. In this work, the optimisation and performance of digital nonlinearity...
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