In this paper, transistor lasers (TLs) are used as an optical modulator for generation of ASK(Amplitude Shift Keying) and FSK (Frequency Shift Keying) optical signals. Our analysis is based on continuity equation, rate equations, and the theory of discontinuity of quasi-fermi level at the abrupt junction. Our simulation results indicate that, the specification of ASK and FSK optical signals, ar...

A trellis-coded modulation scheme, using a coded 2-FSK/2"-PSK modulation format instead of a conventional coded 2"+'-PSK format for m-bitslsymbol data transmission, is considered. Previous work [I, 21 on coded 2FSK/2"-PSK modulation techniques choose two transmission frequencies equally often. In contrast, our method selects the signal points in such a manner that each of the signal dimensions ...

HCO-dependent fluid secretion by the corneal endothelium controls corneal hydration and maintains corneal transparency. Recently, it has been shown that mRNA for the cystic fibrosis transmembrane conductance regulator (CFTR) is expressed in the corneal endothelium; however, protein expression, functional localization, and a possible role in HCO transport have not been reported. Immunoblotting f...

Whole-cell voltage-clamp recordings were made frem cultured bullfrog dorsal root ganglion cells to examine the channel blocking activity ef 20pM of 1, 9-dideoxy forskolin (d-FSK) on the delayed rectifier potassium current [[he drug reduced the maximum amplitude of the current (10-20 nA at +65 mV) by 40-80%. However, the voltages for 50%-activation (= -12 mV) and for 50%-inactivation (= -37 mV) ...

Combined IM/FSK modulation format for payload/label encoding is a promising technique for optical label switching in IP-over-WDM networks. Agile wavelength tunable laser sources are a key component for flexible WDM networking being used for contention resolution at core routers in combination with wavelength conversion. We report on the experimental demonstration of the generation of combined I...

The paper describes a method for the classification of digital modulations. The method uses features computed from parameters of recognized signal such as instantaneous amplitude, instantaneous phase, and spectrum symmetry. The GentleBoost algorithm was used to analyze the features and classify the modulations. ASK, FSK, MSK, BPSK, QPSK, and QAM-16 were chosen for the classification as the best...

In this paper a new method of modulation classification based on spectrogram analysis is described. The classification method can discriminate between various digital signal modulations such as FSK, BPSK, MSK, QPSK and QAM-16. This classification method is examined on signals corrupted by Gaussian noise, phase noise and on signals after their transmission through multipath Rayleigh fading chann...

In this paper a new method of modulation classification is proposed. For the analysis, modulation signals and their spectrograms were obtained in the Matlab program. The classification method is based on spectrogram image recognition and it can discriminate between various digital signal modulations, such as FSK, BPSK, MSK, QPSK and QAM. The new method was tested using modulated signals corrupt...