With more and more developments in wireless communication, spread spectrum modulation techniques have been widely used in various modulation systems. Frequency hopping technique is one of the types of spread spectrum system. In this paper, frequency hopping techniques are compared in a DBPSK modulation system which employs non coherent reception. Fast frequency hopping and multicarrier frequenc...

Radio frequency fingerprint (RFF) identification distinguishes wireless transmitters by exploiting their hardware imperfection that is inherent in typical radio (RF) front ends. This can reduce the risks for identities of legitimate devices being copied, or forged, which also occur conventional software-based systems. paper analyzes feasibility device unique non-linear memory effect transmitter...

the modulation response, relative intensity noise and frequency noise characteristics of qd lasers are investigated theoretically, in presence of an additional optical pumping. it is revealed that the modulation response of qd laser enhances under additional optical beam. by small signal analysis of the carriers' and photons' rates, it is proposed that by injecting excess carriers to ...

In this work, the linear stability analysis of a pulsed Taylor-Couette flow is investigated in the case of a linear Maxwell fluid when both cylinders are subjected to an out-of phase modulation with equal modulation amplitude and equal modulation frequency. The linear problem is solved using the Floquet theory and a technique of converting a boundary value problem to an initial value problem. A...

A neural network based implementation of space vector modulation of a voltage-sourced inverter has been proposed in this paper. Use of ANN based technique avoids the direct computation of trigonometric function (e. g. sine function) as in conventional space vector modulation implementation. The main disadvantages with conventional implementation are, use of any look-up table implies the need fo...

Frequency shift keying (FSK) signal has been widely used in modern radar systems. To intercept the FSK with a high interception probability, reconnaissance receiver should have an ultra-wideband receiving ability. The Nyquist folding (NYFR) is novel non-cooperative and it requires small amount of equipment. When intercepted by NYFR, corresponding output hybrid modulation signal. Therefore, nece...

97 All Rights Reserved © 2012 IJARCSEE Abstract---Use of optical fiber communication is widely use due to its better bit rate and bandwidth and high carrier frequency with low power consumption. So, in this paper, we have analyzed non linear modulation techniques that are self phase modulation (SPM) and cross phase modulation (CPM) in an optical fiber system and discussed how these cause disper...