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

Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) 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. A perfect reconstruction using discrete wavelet packet transmultiplexer in MB-OFDM transceiver counters the degrading effect of ISI, and also conserves bandwidth. In comparison to conventional FFT MB-OFDM, Discrete Wavelet Packet Modulation (DWPM) offers much lower side lobes in the transmitted signal, which reduces inter carrier interference (ICI) and narrowband interference (NBI). In this paper a detail study on conventional MB-OFDM and Discrete Wavelet Packet Transform (DWPT) MB-OFDM is attempted for high data rate ultra wideband (UWB) WPAN physical layer standard. Different multipath components in the UWB channels are characterized by different delays and attenuation. BER performances of MB-OFDM UWB on IEEE 802.15.3a channel models are investigated through simulation study. We show that, at low data rate (55 Mbps) the DWPT MB-OFDM system performs better in the CM4 channel environment than in the CM3 channel due to its inherent frequency diversity. In high data rate (480 Mbps), the BER performance in CM3 channel model is found to be better than in CM4 channel model. DWPT MB-OFDM outperforms than the conventional FFT MB-OFDM for high data rate applications.

Performance Study of Discrete Wavelet Packet Based MB-OFDM System for Short Range Indoor Wireless Environment

An energy-efficient cognitive radio network (CRN) design is one of the primary requirements for the low-battery-driven wireless terminals in the presence of primary user emulation attack. Furthermore, sensing accuracy is also essential for allocating vacant bands to the secondary users (SUs) for data transmission. Hence, this study focuses on designing an energy-efficient double threshold-based CRN. The adversarial effects arising in the presence of the attacker are analysed and are treated as constraints while formulating the energy efficiency (EE) maximisation problem. To develop the formulation, a unique SU selection algorithm to identify most eligible SUs for data transmission is proposed. The EE is then maximised by minimising the total power consumption through novel adaptive resource allocation algorithm. Hence, the authors proposed approaches are based on the suitable selection of SUs and adaptive power allocation under the constraints of maximum throughput, controlled transmission power providing sufficient protection to the primary user, minimum power consumption and minimum false alarm probability. The extensive simulation results demonstrate that the proposed scheme substantially increases EE with lower complexity over the conventional scheme.

https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-com.2016.0235

Intelligent resource allocation scheme for the cognitive radio network in the presence of primary user emulation attack

Motivated by the distributed control strategy of a multi-agent system, this paper presents a distributed voltage and frequency synchronization schemes for an AC microgrid (MG). For a low voltage MG, the line impedance between the distributed generator (DG) units are predominantly resistive, therefore the existing droop control approach i.e. P — ω and Q — v droop yields transients and poor stability. In view of improving the transient response and stability, a new resistive droop control approach is proposed this paper. Here, the considered MG test system is a low voltage MG that operates in islanded mode. Three control loops namely power, voltage and current control of a DG are analyzed under a special case of resistive low voltage MG. The proposed control scheme is implemented locally at each DG terminal. Besides this, secondary distributed cooperative control is used to regulate the voltage and frequency deviations caused by the primary droop control. The effectiveness of the proposed voltage and frequency synchronization scheme is verified by creating a simulation setup considering a 4-bus MG test system using MATLAB/Simulink. The results obtained envisage that the proposed scheme is restoring the voltage and frequency in a short time duration.

Voltage and frequency synchronization of a low voltage inverter based microgrid

Optimal resource allocation for soft decision fusion-based cooperative spectrum sensing in cognitive radio networks

Body area networks (BANs) are wireless networks around the human body. Ultra-wideband (UWB) is one of the most preferred candidates for the physical layer of BAN. However, the attenuation due to human body tissues and the movement of body parts with respect to each other causes severe attenuation and limits the range of UWB. Hence, new and novel methods are required to improve communications in UWB BAN. The paper proposes, hybrid amplify forward and decode forward relays for communication in body area networks. Scenarios in the presence of multiple relays for both body surface and body surface to external models have been taken into consideration. The performance has been tested using IEEE 802.15 task group 6 designated channel models developed from real-time measurements. The findings from the analytical as well as simulation-based study indicate that hybrid relaying provides a versatile performance, and improves the reliability of the communication link by decreasing the bit error rate. The performance has been further validated by the transmission of medical magnetic resonance images. The results indicate that hybrid relaying has the best performance, and it can undoubtedly improve the reliability of the body area networks.

Susmita Das

Papers

Performance Study of Discrete Wavelet Packet Based MB-OFDM System for Short Range Indoor Wireless Environment

Intelligent resource allocation scheme for the cognitive radio network in the presence of primary user emulation attack

Voltage and frequency synchronization of a low voltage inverter based microgrid

Optimal resource allocation for soft decision fusion-based cooperative spectrum sensing in cognitive radio networks

Reliable communication in UWB body area networks using multiple hybrid relays