This article addresses the problem of designing twochannel near-perfect-reconstruction lter banks over multidimensional lattices. First, a cosine-modulated lter structure having arbitrary spatial shift and phase parameters is considered. The use of this structure leads to many possible two-channel multirate systems. The perfect reconstruction conditions are studied and appropriate choices for t...

In this paper, we propose an optical millimetre wave radio-over-fibre (mm-wave RoF) system that uses a dual drive Mach Zehnder modulator (DD-MZM), which is biased at the maximum transmission biasing point, to generate an optical double sideband-suppressed carrier. The input to the DD-MZM are binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 8-phase shift keying (8-PSK) and...

Last years, Wavelet Packet Modulation (WPM) or Wavelet Packet Transform based Orthogonal Frequency Division Multiplexing (WPT-OFDM) have been introduced to wired and wireless communication fields as efficient Multicarrier Modulation (MCM) techniques. The wavelets have interesting features such as flexibility, compatibility and localization in both time and frequency domains with no need to use ...

-The Linear Frequency Modulation (LFM) waveform is the most commonly and extensively used signal in practical radar system. This paper introduces a new scheme of Piecewise Nonlinear Frequency Modulation (PNFM) for generating good code sets. Each code set has good autocorrelation with small peak sidelobes and cross-correlation. A weighting function is usually applied in order to reduce the sidel...

Starting from the context of finite dimensional signal spaces, as it can be constructively realized on a computer and completely described in terms of concepts from linear algebra, we describe first the algebraic side of this problem. The second part of the material emphasizes the necessary definitions and problems (e.g., the form of convergence of various infinite series occurring during the d...

background and objective: vep is a powerful method to study visual system via evaluating evoked potentials. technologic and instrumental restrictions may be the reason of having studies on optical modulation and induction such as color, spatial frequency and contrast. developments of computer software and hardware may lead to an increase in the flexibility of pattern designs. material and meth...

A theoretical and experimental analysis of two applications of the 42m electrooptic modulator is performed in the time and in the frequency domains. The analysis refers to the case of a harmonic electric input signal. The two applications are that of frequency transmitter, when the modulation is linear and the output signal has the same frequency as the modulating voltage, and that of frequency...

We report on the effect of band-pass filtering of the time trajectories of spectral envelopes on speech recognition. Several types of filter (linear-phase FIR, DCT, and DFT) are studied. Results indicate the relative importance of different components of the modulation spectrum of speech for ASR. General conclusions are: (1) most of the useful linguistic information is in modulation frequency c...

We present how the laser diode (LD) current tuning induced intensity modulation affects the performance of an open-loop resonator fibre optic gyro (R-FOG) with sinusoidal wave modulation. The expression for the demodulation curve under intensity modulation caused by the dynamic input rotation angular rate and varied environmental factors induced resonance frequency drift is provided. Numerical ...