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The paper deals with research of energy characteristics of multilevel modulation techniques for modern broadband radio systems. The problems of modeling and analysis of digital data transmission channel are considered
Work presented in this paper investigates the feasibility of Continuous-Phase Quaternary Frequency Shift Keying (CP-QFSK) with limiter-discriminator detection modem as a viable dual data rate system that can be employed in TDMA short range communications systems. It offers a great deal of spectral efficiency in multi-channel systems, hardware simplicity and robustness to adjacent Channel Interference...
This paper compares two types of physical unclonable function (PUF) circuits in terms of reliability, mismatch-based PUF vs. physical-based PUF. Most previous PUF circuits utilize device mismatches for generating random responses. Although they have sufficient random features, there is a reliability issue that some portions of bits are changed over time during operation or under noisy environments...
This paper is concerned with the operator-based nonlinear networked control systems with packet errors. In communication network, packet may include errors caused by noise in network, and in conventional control method, these packets are regarded as lost packets. This means information of control signals is also lost completly, even if the disturbance caused by errors is acceptable for control systems...
Wireless Multimedia Sensor Networks (WMSN) are designed to transmit audio and video streams, still images and scalar data. Multimedia transmission over wireless sensor network has many killer applications like, video surveillance system, object tracking, telemedicine, theft control system and traffic monitoring. Researchers are facing many challenges such as higher data rate, lower energy consumption,...
MIMO systems provides number of features like spatial diversity, multiplexing gain, and high spectral efficiency gain by keeping the bandwidth expansion or transmission power similar to other systems. The major concern in the system is inter symbol interference (ISI) caused by the channel. An equalizer is deployed on the receiver side to detract the effect of ISI. In this paper, simulation is done...
Wireless communication is vulnerable to intentional electromagnetic interference, and therefore it is important to understand the interfering mechanisms. In this paper we investigate the effect of pulsed interference - as compared to continuous interference - on a receiver of digital amplitude modulated signals. To correctly receive the signals, a threshold estimate has to be computed for the proper...
In this paper, a low overhead preamble structure is proposed for the interference approximation method — complex (IAM-C) method in offset quadrature amplitude modulation based orthogonal frequency division multiplexing (OQAM-OFDM) systems. Compared with the conventional preamble structure with three columns of symbols, the proposed preamble structure only requires two columns of symbols as the preamble...
The modified Luise and Reggiannini (L&R) algorithm is one of the frequency offset estimation algorithms suitable for use with the Digital Video Broadcasting — Satellite (DVB-S2) standard. Recently we demonstrated an enhanced poly-polarization multiplexing (EPPM) system incorporating L&R frequency recovery as a hardware prototype in order to evaluate its high spectral-efficiency in a real satellite...
In this paper, a power system having different loads which are switched at different instants is considered. We consider scenarios when the loads in a power system change at very fast rate. This switching causes impulsive noise in the associated power line communication (PLC) channel which limits the average bit error rate (BER) performance. The paper aims to analyze the performance of a PLC system...
We propose a 4D-CMA feedback for butterfly filter adaptation enabling separation of channel compensation and polarization demultiplex. Using a digital polarization controller for demultiplex we demonstrate feasibility and ∼10-fold speed increase compared to standard CMA.
Multiple-input-multiple-output (MIMO) technique for visible light communications (VLC) facilitates higher data rate thanks to parallel data transmission. However, full channel-state information (CSI) is a requirement in a MIMO system at all times for successful data recovery, which is a major challenging factor in mobility and shadowing scenarios. In this paper we introduce a novel approach for a...
This paper analyses the communication performance for visible light communication (VLC) with Manchester encoded amplitude modulation. In particular, it considers the ripple generated by the LED driver as an important noise contribution for VLC. The ripple depends on the oscillation frequency of the converter which typically is chosen to satisfy other performance criteria such as power conversion efficiency...
Inter-symbol interference (ISI) may become detrimental when the data rate rises in the atmospheric scattering UV channel. In this paper, we model the ISI effect due to delay spread in the UV channel and evaluate the approach of direct sequence spread spectrum (DSSS) in eliminating ISI and improve the system performance. Both the measured noise and newly reported experimental results of impulse response...
This paper experimentally demonstrates the 10 Gb/s optical access network with downstream transmission at 1550-nm wavelength through a commercial EDFA in order to accomplish the maximum distance of 62 Km over SSMF and 256 subscribers. The theoretical analysis of three effects are considered: (1) link power budget from insertion loss of optical components, fiber's attenuation and an EDFA's gain, (2)...
In urban sensor networks, the diversity of propagation conditions can lead to the simultaneous reception of signals having very different power levels. Given the diversity of wireless technologies used in this area, implementing gateways using a Software-Defined Radio (SDR) approach seems to be a very practical solution. Overcoming the large dynamic range may however require a very high resolution...
Conventional threshold-based method, such as nulling or clipping, is simple and effective for mitigation of impulsive noise (IN) in power-line commnucations (PLC) environment. However, we raise two issues for the threshold-based approach. First, for orthogonal frequency division modulation (OFDM) broadband PLC systems, the high peak-to-average power ratio (PAPR) characteristics of the received OFDM...
In-Band Full-Duplex (FDX) and MultiPacket Reception (MPR) are two transmission technologies that can be used together to improve the overall network capacity. However, the FDX Self-Interference Cancellation (SIC) techniques only filter part of the transmitted signal from the reception. This paper analyses how the FDX SIC residual noise influences the performance of MPR systems. It considers power...
The problem of bit and power loading for bit rate maximization in OFDM data communications over indoor powerline channels is investigated and a simple method for bit/power allocation in a single cycle of the mains is developed. The proposed solution is based on the so called Zadeh's representation for modelling the linear periodically time-varying behavior of powerline channels. Numerical results...
As circuits become increasingly complex and testing time continues to increase, it is becoming more and more important to use built-in self-test techniques to ensure that the circuit is working according to its data sheet specifications. This paper presents an embedded test instrument in an IBM 130 nm CMOS technology, which allows for quick and easy probabilistic test evaluation of the bit-error ratio...
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