Spread Spectrum technique is a digital passband technique. It uses a special code which is known only to the transmitter and receiver of that message. The special code appears as a noise signal to the jammer who tries to jam the channel. In this paper, we present the Direct Sequence Spread Spectrum. Firstly, we show an overview of Direct Sequence Spread Spectrum, then, we simulate Direct Sequen...

The Surface Evolver is a general-purpose software with which one can simulate innumerous physical experiments. Since its first release in 1989, its sole developer and maintainer K. Brakke prioritised the technical part. This made Evolver applicable in many Science Areas, but its input is only through data files and command lines. Here we present EV, the first human-computer interface for Evolve...

Computing the eigenvalues and eigenvectors of a large sparse nonsymmetric matrix arises in many applications and can be a very computationally challenging problem. In this paper we propose the Augmented Block Householder Arnoldi (ABHA) method that combines the advantages of a block routine with an augmented Krylov routine. A public domain MATLAB code ahbeigs has been developed and numerical exp...

An overview of the hardware and software used to study the transverse emittance on the ISIS Pulsed Spallation Neutron Source at RAL is given. Vertical and horizontal slit-slit emittance scanners are used for high resolution measurements. Data acquisition and analysis is performed using in-house written C# code. Alternatively, a pepperpot head can be used to record both the emittance and beam pr...

This paper describes one possible way, how MCU hardware peripherals (e.g. PWMs, Timers, ADCs, etc.) can be simulated in Matlab/Simulink environment and how code controling these peripherals can be generated. The described implementation of the MCU hardware peripherals is based on using functioncall outputs as peripheral interrupts and external blocks called Methods as peripheral control functio...

This study analyzed the use of LDPC codes as error control coding in energy-efficiency of wireless sensor network nodes. Meanwhile, it provided the application scheme of LDPC codes in wireless sensor networks, which adopts regular LDPC codes with various code length and code rate of 0.5. The result shows that LDPC codes, as the error control coding, is quite suitable for energy-constrained wire...

The purpose of this research is to develop a MATLAB model which can calculate the aerodynamics, such as lift, drag, and pressure, on an airfoil as it changes shape. This model needs to be computationally efficient and should have reasonable accuracy. A constant strength doublet panel code, which takes thickness and camber distribution as inputs, is used to model the aerodynamics. This code has ...

In this study, probabilistic risk assessment has been carried out for the prediction of gas explosion loads due to hydrocarbon leaks and subsequent explosions in the topside of offshore platforms. In the initial phase of the risk assessment, the effect of various scenario parameters on the annual probability of gas explosion was quantified via a MATLAB code. For calculating the gas explosion fr...

There has been a dramatic change in the field of field of telelcommunication service. M-ary Quadrature Amplitude modulation and Quadrature Phase shift Keying (QPSK) modulation schemes are considered in Wideband code Division Multiple Access(WCDMA) system. Here we are using MATLAB for simulation and evaluation of BER ( Bit Error Rate )and SNR(Siganl to Noise Ratio). There is analysis of Quadratu...

Spread spectrum communication is a new theory and modulation technique, and different from the conventional communication system. A good correlation property and large linear period of Pseudo-random sequence is the basis of spread spectrum communication systems intern CDMA (code division multiple access communication systems). Out of several techniques to implement direct sequence spread Spectr...