This paper discusses the effect of various optical amplifier configurations i.e. pre-amplifier, power booster and using both of them on simplex and 8 channel WDM inter-satellite free space optical communication system by using NRZ-OOK in LEO networks under scintillation effect. We observed high quality factor at channel wavelength of 1550 nm using Mach-Zehnder Modulator (MZM). The simulated res...

In the next generation of lightwave systems, high speed datarate like 10Gb/s or 40Gb/s per channel is very attractive. In addition, to pack more channels into one single fiber, channel spacing is decreased from 200GHz to 50GHz or even smaller. The direct side-effect is that linear and nonlinear degrading effects will be severe in such high-speed lightwave systems. An optimal modulation format w...

|We evaluate the performance of indoor infrared wireless systems using ono keying code-division multiple-access (OOKCDMA) systems with three kinds of equalizers: decision-feedback equalizer (DFE), decisionfeedforward-and-feedback equalizer (DFFE), and feedforward equalizer (FE). To estimate the impulse response, we use the training sequence that alternates `1' and `0' sequentially. Among three ...

In this paper, joint estimation of the optimal threshold, synchronization point, and integration interval is developed for ultrawideband (UWB) energy detectors employing on-off keying (OOK) modulation. Gaussian approximation of the received signal statistics is shown to enable low complexity solutions at the expense of some performance degradation. The performances of the optimal and suboptimal...

Due to unique characteristics of sensor nodes, choosing energy-efficient modulation scheme with low-complexity implementation (refereed to as green modulation) is a critical factor in the physical layer of Wireless Sensor Networks (WSNs). This paper presents (to the best of our knowledge) the first in-depth analysis of energy efficiency of various modulation schemes using realistic parameters i...

Hierdie artikel bespreek die agtergrond van opvoedkundige tegnologie en die trefkrag daarvan op alle fasette van die onderwys. Daar word definisies gegee van “ opvoedkundige tegnologie” in die ruim ste sin van die woord en ook van opvoedkundige tegnoloé. B loom se taksonom ie van opvoedkundige doelstellings op die kognitiew e en affektiew e terreine word met betrekking tot die ontwikkeling van ...

-In wireless optical system, CDMA suits well for high bit rate systems where good security is needed and mobility is not important. It would be economical when compared to radio frequency band and much safer since there is no electromagnetic effect. Infrared systems are used for its widest bandwidth and are not affected by radio transmission. The advantage of the prime code and the security iss...

The influence of atmospheric environment is fundamental for Free-Space Optical link (FSO). The atmosphere can significantly degrade the communication quality of FSO up to so low received power/RSSI level that it can lead to the loss of communication. For this reason, authors used a professional weather station built on site of FSO link for measurement of real atmospheric conditions such as wind...

| This paper presents numerical channel capacity computations for phase-shift-keyed (PSK) signal constellations with a zero-energy point, when equiprobable signaling is used and the phase of the received signal is uncertain. We refer to such constellations as on-oo-keyed PSK (OOK-PSK). We derive conditional probability density functions and compute numerical capacity curves for the following ch...

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