Antenna array distributions and their associated patterns are now designed on physical principles, based on placement of zeros of the array polynomial. An overview of the synthesis processes is given. Robust and low Q distributions for linear arrays and circular planar arrays, that provide variable side lobe level pencil beam patterns, are treated in detail. Associated difference patterns are i...

Abstract In direct sequence code division multiple access (DS-CDMA), frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can be applied to exploit the channel frequency-selectivity and therefore can replace the conventional rake combining with a much improved bit error rate (BER) performance. For a small spreading factor, however, the residual inter-chip inte...

An overview is given on the fundamental problems when combining acoustic echo cancellation (AEC) with adaptive beamforming microphone array (ABMA) in fullduplex communications. For reasons of computational complexity and functionality, a compromise is necessary between one echo canceller per microphone signal and a single echo canceller for the beamforming output. Here, the decomposition of the...

A new echo canceller for discrete multitone (DMT) systems is presented where each used tone has its own per tone echo canceller (PT-EC) in addition to a per tone equalizer (PTEQ) [1, 2]. This enables us to optimize the Signal-to-Noise Ratio (SNR) for each tone separately by solving a Minimum Mean Square Error (MMSE) problem for each tone. Simulation results confirm improved performance over tim...

Aiming to resolve azimuth-dense targets in interference environments, the radar needs have ability of single snap echo angular super-resolution with anti-interference. To solve problem, algorithm based on while anti-interference blocking matrix method is studied for active phased array (APAR) this paper. Since conventional MUSIC and iterative adaptive (IAA) are limited echo, re-weighted least s...

Sequences having better autocorrelation properties play a crucial role in enhancing the performance of active sensing systems. Hence, sequences with good are very much demand. In this paper, we addressed problem designing unimodular sequence side-lobe levels. We formulated it as constrained optimization comprising Integrated Side-lobe Level (ISL) metric and then proposed an effective algorithm ...

The similarity of the mathematical description of random-field spin systems to orthogonal frequency-division multiplexing (OFDM) scheme for wireless communication is exploited in an intercarrier-interference (ICI) canceller used in the demodulation of OFDM. The translational symmetry in the Fourier domain generically concentrates the major contribution of ICI from each subcarrier in the subcarr...

The effect of removing parts of unfertilized and fertilized eggs of Dentalium has been studied. Up to 70 % of the volume of a 1st polar lobe can be removed from the vegetal side of both unfertilized and fertilized eggs, without influencing apical tuft formation. The post-trochal region is reduced. These eggs form a reduced polar lobe at first cleavage. After removal of more than 70 % of the vol...

The performance of an echo canceller systems deployed in a practical communication environment (i.e. the presence of background noise and the possible double talk scenario) depends on an accurate Voice Activity Detector (VAD) and an effective filter coefficient adaptation strategies. Accuracy of the VAD, which affects the coefficient adaptation strategy, is itself affected by the presence of ba...

Digital filtering is one of the main fundamental aspect of Digital signal processing, So Digital filters are widely used in many digital signal processing applications. In this paper low-pass FIR filter is implemented using an efficient adjustable window function based on Blackman window function. In this adjustable window function for a fixed length the bandwidth of main lobe and side lobe amp...