The Social Psychology of Organizations.

Stable non-Gaussian random processes , by G. Samorodnitsky and M. S. Taqqu. Pp. 632. £49.50. 1994. ISBN 0-412-05171-0 (Chapman and Hall).

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Linear And Nonlinear Programming

Neural networks

Ultra Wideband Signals and Systems in Communication Engineering

orthogonal frequency-division multiplexing (OFDM) communication systems, the frequency offsets in mobile radio channels distort the orthogonality between subcarriers resulting in inter-carrier interference (ICI) In this paper, First OFDM system is modeled and simulated under different channel conditions such as AWGN and Rayleigh fading Subsequently pulse shaping technique for ICI power reduction in OFDM systems is investigated A number of pulse shaping functions such as Rectangular pulse shape, Sinc power pulse (SP) and Improved sinc power pulse (ISP) have been considered for ICI power reduction The performance of each pulse shaping function is evaluated and compared with each other using the parameters such as ICI power, SIR (Signal to Interference Ratio) and BER (Bit Error Rate) It is found that ISP pulse shape outperforms to all other pulse shaping functions by the above parameters

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Performance Enhancement of OFDM System with ICI Reduction Technique

Space division multiple access-orthogonal frequency division multiplexing system has become a potential wireless communication system by offering high spectral efficiency, performance and capacity. This article deals with minimum symbol error rate MSER-based multiuser detection MUD technique for the space division multiple access-orthogonal frequency division multiplexing system using an efficient invasive weed optimization IWO algorithm. The IWO algorithm is used for finding optimal weights such that the probability of error is directly minimized rather than minimizing the mean square error. Because of this, the MSER MUD is able to detect users even in overload scenario, where the number of users is more than the number of receiving antennas, unlike several classical detection techniques. The IWO is inspired from the nature of invasive colonization of weeds and relatively simple compared with other optimization techniques. The bit error rate performance of the proposed IWO-aided MSER MUD is found to be better than minimum means square error and differential evolution algorithm-aided MSER MUDs. Simulation results show that the proposed IWO MSER achieves faster convergence and lower complexity compared with the differential evolution MSER MUD. Copyright © 2013 John Wiley & Sons, Ltd.

Minimum symbol error rate multiuser detection using an effective invasive weed optimization for MIMO/SDMA-OFDM system

Electrocardiogram beat type dictionary based compressed sensing for telecardiology application

This paper presents a comparison between multilayer perceptron neural network (MLP NN) and Radial basis feedforward neural network (RBF NN) techniques for the detection of inter-turn short circuit fault in stator winding of an induction motor The fault location process is based on the monitoring the three phase shifts between the line current and the phase voltage of the induction machine

A comparison between MLP NN and RBF NN techniques for the detection of stator inter-turn fault of an induction motor

Multiband Orthogonal Frequency Division Multiplexing (MBOFDM) approach using UWB signals with short duration of pulses provide unique advantages in short-range high data rate wireless applications which include easy penetration through obstacles, high precision ranging and low processing power. In this paper a performance study on MB-OFDM is attempted for high data rate ultra wideband (UWB) WPAN physical layer standard according to modulation techniques such as QPSK, 16-QAM, 64-QAM etc. Different multipath components in the UWB channels are characterized by different delays and attenuation. The channel models chosen in simulation of MB-OFDM UWB communication system are different from standard UWB channels considering realistic multipath resolution and operating frequencies. In this research different amplitude fading statistics for UWB channel (IEEE 802.15.3a) are analysed. The BER performance of MB-OFDM UWB on modified UWB channel models are investigated through simulation study. It is observed that QPSK modulation for the MB-OFDM UWB system performs better than 16-QAM and 64-QAM in the CM3 (NLOS) and CM4 (NLOS) channel environment. We show that, at low data rate (55 Mbps) the MB-OFDM system performs better in the CM4 channel environment than in the CM3, CM2 and CM1 channel model due to its inherent frequency diversity. In high data rate (480 Mbps), the BER performance in CM1 channel model is found to be better than in CM2, CM3, CM4 channel model.

/pdf/efficacy-of-multiband-ofdm-approach-in-high-data-rate-ultra-5g3vowa8wt.pdf

Susmita Das

Papers

Performance Enhancement of OFDM System with ICI Reduction Technique

Minimum symbol error rate multiuser detection using an effective invasive weed optimization for MIMO/SDMA-OFDM system

Electrocardiogram beat type dictionary based compressed sensing for telecardiology application

A comparison between MLP NN and RBF NN techniques for the detection of stator inter-turn fault of an induction motor

Efficacy of Multiband OFDM Approach in High Data Rate Ultra WideBand WPAN Physical Layer Standard using Realistic Channel Models