We show that imposing a certain number of vanishing moments on a scaling function (e.g., coiflets) leads to fairly small phase distortion on its associated filter bank in the neighborhood of DC. However, the phase distortion at the other frequencies can be much larger. We design a new class of real-valued, compactly supported, orthonormal, and nearly symmetric wavelets (we call them generalized...

A voltage-mode high input impedance first-order allpass, highpass and lowpass filters using two differential voltage current conveyors (DVCCs), one grounded capacitor and one grounded resistor is presented. The allpass, highpass and lowpass allpass signals can be obtained simultaneously from the circuit configuration. The suggested filter uses a canonical number of passive components without re...

................................................................................................................... v CHAPTER 1: INTRODUCTION .................................................................................. 1 1.1 Background ................................................................................................... 1 1.2 Statement of the Problem ...........................

A simple design technique for separable denominator circularly symmetric lowpass filter is described. In this technique an FIR filter function with sharp cutoff characteristic and amenable to efficient_ implementation is used to meet the transition band requirement of the filter and to provide approximately circularly Symmetric passband. However, the FIR filter nas high transmission in stopband...

This paper introduces a new Channel Estimation (CE) filter called Polyphase Lowpass-Interpolation (PLI)-filter for downlink coherent Rake-combining in a DSCDMA mobile environment. In this case some UTRA FDD scenarios are taken for showing the feasibility of this approach. It uses known periodically time-multiplexed pilot symbols for interpolating the channel coefficients in between. The idea of...

The traditional lowpass Sigma-Delta (Σ∆) based Analog-to-Digital (A/D) conversion principle has been recently extended to bandpass for direct IF conversion. Such converter offers high Signal-to-Noise (SNR) ratios for narrowband signals relative to the sampling frequency, at significantly lower oversampling ratios in comparison to the conventional lowpass Σ∆ converters. In this paper a sixth-ord...

In this paper the design of single filter frequency masking recursive filters is discussed. We briefly review the previously proposed lowpass narrow-band filters and propose a design method for highpass narrow-band filters. Wide-band filters are also discussed. The proposed approach uses several identical filters, except for periodicity, which are mapped to a single hardware structure using fol...