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Integrated communications with sensing and measurements are relevant technologies identified to provide automation for the smart grid (SG) applications. Incorporating intelligence into the electrical grid necessitates the gathering of relevant information in in realtime from variety of electrical utility sources located either at the bulk generation, transmission, distribution or customer domain....
Genetic Programming (GP) is an Evolutionary Algorithm commonly used to evolve computer programs in order to solve a particular task. Therefore, GP has been used to tackle different problems like classification and regression. In this work, the capabilities of GP in other types of problems are explored, particularly the feature selection problem. For this purpose, GP is applied to a set of benchmark...
Collaborative beamforming is a promising technique for improving energy efficiency of uplink communications in wireless sensor networks. It is based on the fact that, if carrier phases of individual sensor nodes are synchronized precisely enough, sensor nodes can jointly form a beampattern with stable mainlobe. In this paper, we analyze the bit error rate performance of such collaborative transmission...
Previously, a hybrid mechanism employing clipping and turbo coding was vindicated to be remarkably robust against impulse noise, characterized by strong power and frequent occurrence, in Orthogonal Frequency Division Multiplexing systems. This work aims at addressing the impulse noise together with the distortion induced by a more realistic transmitter configuration: Clipping and filtering for the...
This paper addresses the impacts of biasing and clipping on free-space optical (FSO) communications system over weak turbulence channel employing direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM). With atmospheric attenuation, turbulence and pointing errors, we present a statistical model for the optical intensity fluctuation at the receiver. The average bit error...
A number of important digital modulation schemes including differential phase-shift keying (DPSK), differentially encoded binary phase-shift keying (DEBPSK) and offset quadrature phase-shift keying (OQPSK), are widely used in military communications applications. Conventionally, the additive white Gaussian noise (AWGN) channel is employed to model many noisy environments. However, AWGN model is less...
In visible light communication (VLC) systems, the employing of orthogonal frequency division multiplexing (OFDM) may produce nonlinear distortion, due to the nonlinear characteristics of LEDs and the high peak to average power ratio (PAPR) of OFDM. Moreover, the clipping block deteriorates the distortion. In this paper, an advanced A-law algorithm for alleviating such distortion in VLC-OFDM systems...
This paper describes a successive multiuser detection technique for Direct Sequence Code Division Multiple Access (DS-CDMA) systems. In conventional CDMA system, single-user detection is employed, so that the interference between users or multiple access interference (MAI) component is considered as noise, which contributes to the statistics of detection variables affecting the quality of detection...
The performance of Low-Density Parity-Check codes over symmetric alpha-stable impulsive noise channels is considered in this paper. Due to the lack of closed-form expressions for the probability density functions of almost all the alpha-stable distributions, an efficient non-linear approximation method for channel log-likelihood ratio is presented to achieve high decoding performance covering the...
In order to evaluate the immunity of DVB signal to external interferer we made some measurements and comparisons between DVB-T signal and DVB-C signal of 8 MHz bandwidth subject to a FM interferer.
The paper describes a 8.125–15.625 Gbps medium-reach SerDes macro for use in a networking memory system. The SerDes employs a sub-sampling ring-oscillator phase-locked loop to obtain a large frequency range with low jitter performance. In addition, the transmitter uses a modified hybrid output driver and a multi-step duty-cycle corrector. The receiver uses a BER-based calibration loop to find the...
Study of anti-jamming effects on the Joint Tactical Information Distribution System (JTIDS) operating in the complicated electromagnetic environment is carried out in this paper. With the help of Simulink simulation platform of MATLAB, the JTIDS model is built up using channel coding, spread spectrum and modulation technologies. It is shown that, with some interferences introduced into the system,...
In dispersion-unmanaged 100-Gbit/s single-channel transmission, the one-to-one relationship between error-rate and noise variance does not hold at high powers. More accurate error assessment than with Gaussian modeling can be obtained by involving high order statistics.
We report the first use of low noise in-line phase-sensitive amplifiers in a long-haul circulating loop experiment. A reach extension of 200% compared to using EDFAs is observed with a 10 GBd QPSK signal.
Impulsive noise is a major source of degradation in industrial communications. Orthogonal frequency-division multiplexing (OFDM) is an extended technique used in many industrial communications, however the performance of OFDM systems is reduced under an impulsive noise source. To increase the system performance, impulsive noise detection and suppression techniques can be designed in the communication...
In this paper, we propose a time-domain oversampled receiver for orthogonal frequency division multiplexing (OFDM) in underwater acoustic communication. Without changing the structure of the transmitter, significant gains are acquired by time- domain oversampling at the receiver. Using time- domain oversampling, the energy of transmitted symbols is concentrated on the first N subcarriers, while additive...
We demonstrate robust error-free transmission of 51.56 Gbit/s PAM-4 over multiple examples of 100m of multimode fiber with 905nm VCSELs. We further demonstrate the need to include level dependent RIN when assessing impairments and predicting performance of PAM-4 MMF links.
Amplitude-noise squeezing due to saturation in parametric multicasting is investigated. The improved receiver sensitivity of 10 copies by 2-dB over a phase-insensitive device has been obtained as a result of signal-gain elevation, and noise-quenching in a four-mode phase-sensitive parametric multicaster.
We demonstrate mitigation of inter-channel nonlinear interference noise (NLIN) in WDM systems for several amplification schemes. Using a practical decision directed recursive least-squares algorithm, we take advantage of the temporal correlations of NLIN to achieve a notable improvement in system performance.
In this paper we consider the use of single carrier modulations combined with frequency-domain equalization schemes (SC-FDE) for underwater acoustic (UWA) communications. The propagation channel is doubly selective, with both time dispersion effects inherent to multipath propagation and phase drifts associated to Doppler effects. We propose a joint equalization and phase drift estimation and compensation...
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