The Carrier Super-Positioning Satellite System is a promising telecommunication system because the efficiency of frequency usage is twice as much of that in existing satellite systems. Interference canceller used in the carrier superpositioning system is greatly effected by the nonlinear distortion of satellite TWTA. A scheme of the nonlinearity compensation for P-MP VSAT network has been propo...

A near-end crosstalk (NEXT) canceller using a fine-grain pipelined architecture is presented. Performance of the proposed pipelined NEXT canceller is demonstrated in the 125 Mb/s twisted-pair distributed data interface and 155.52 Mb/s asynchronous transfer mode local area network applications. In addition, we analyze the computational complexity of the proposed pipelined NEXT canceller. It is s...

In this paper, a new configuration of Tapered Slot Antenna (TSA) with improved radiation pattern is proposed and studied. This antenna is designed in the form of a substrate integrated waveguide (SIW) array with respect to side lobe level constraints. For side lobe reduction, a simple quasi-triangular distribution is proposed and is accomplished uniquely by means of 3 dB power dividers. A 12-wa...

Directive antenna array with reduced side lobe level can be obtained using thinned array. This paper describes the design of planar thinned array using Hadamard matrix-like arrangement. Here ‘on’ and ‘off’ states of the antenna elements are arranged based on Hadamard Matrix and inter-element spacing in x and y-directions are varied and then genetic algorithm is used to optimize lowest side lobe...

A coprime sensor array (CSA) is a non-uniform linear array obtained by interleaving two uniform linear arrays (ULAs) that are undersampled by coprime factors. A CSA provides the resolution of a fully populated ULA of the same aperture using fewer sensors. However, the peak side lobe level in a CSA is higher than the peak side lobe of the equivalent full ULA with the same resolution. Adding more...

In many applications like FIR filters, FFT, signal processing and measurements, we are required (~45 dB) or less side lobes amplitudes. However, the problem is usual window based FIR filter design lies in its side lobes amplitudes that are higher than the requirement of application. We propose a window function, which has better performance like narrower main lobe width, minimum side lobe peak ...

Abstract— Direct Sequence Spread Spectrum (DS-SS) signals exhibit cyclostationary properties which imply a redundancy between frequency components separated by multiples of the symbol rate. In this paper we present a Multiple Access Interference Canceller that explores this property and applies to UMTS-TDD. This frequency domain canceller operates in the spreaded signal in such way that the int...

Design of thinned elliptical antenna arrays of uniformly excited isotropic antennas using particle swarm optimization (PSO), is reported. Thinned arrays can generate directive beam with minimum side lobe level (SLL) without degrading the performance of fully populated antenna arrays significantly. Thinning of elliptical antenna arrays using PSO are optimized with different values of eccentricit...

Man machine interaction requires an acoustic interface for providing full duplex hands-free communication. The transfer-function generalized sidelobe canceller (TF-GSC) is an adaptive beamformer suitable for enhancing a speech signal received by an array of microphones in a noisy and reverberant environment. When an echo signal is also present in the microphone output signals, cascade schemes o...

The design of printed antenna arrays with high side lobe suppression has been analysed in this article. The parallel, perpendicular and corner reflectors have been investigated. The arrays are with symmetrical pentagonal dipoles as radiating elements operating at a second resonance. The symmetrical tapered feed network, which consists of impedance transformers, with Dolph-Chebyshev distribution...