2013 Tenth International Conference on Wireless and Optical Communications Networks (WOCN)

Multiple Transmit and receive antenna are now widely used to form multiple input., multiple output (MIMO) channels to increase the capacity as well as to reduce the Bit Error Rate (BER). This paper describes the combination of MIMO system along with Orthogonal Frequency Division Multiplexing (OFDM) system which offers important features of both the system. Use of Hybrid MIMO-OFDM system is conside... View full abstract»

Orthogonal Frequency Division Multiplexing (OFDM) systems are particularly sensitive to carrier frequency offset (CFO) and Inphase and Quadrature (I/Q) imbalance. These parameters degrade the performance of OFDM-based system as they destroy the orthogonality between sub-carriers. In this paper, we designed an estimation algorithm which is based on non data aided technique for the CFO and I/Q imbal... View full abstract»

In this paper, a Dirty Paper Coding (DPC) based Minimum Mean Square Error (MMSE) beamforming design for a MIMO interference channel has been introduced. It includes signal leakage and linear transmit filters. At each transmitter, MMSE approach has been used comprising the signal with the interference. The simulation results show that the proposed design achieves significant reduction in mean squar... View full abstract»

Variations in ambient air quality data are caused by changes in the pollutant emission rate, and meteorological and topographical conditions of the place. Mass concentration of aerosol is a measure of air quality and aerosol source strength at a particular location. It has been shown that clear sky visibility over land has decreased globally over the past 30 years, indicative of an increase in aer... View full abstract»

Covert channel is a known vulnerability in most of the network protocols that makes it possible for peers to communicate non-legitimately using known channels. This papers aims at demonstrating information theft scenario by means of covert channel in which it is used as a carrier for transmitting information that is stolen by exploiting HTTP Post method. The paper describes and demonstrates a mech... View full abstract»

Internet threat have different form of attacks, considering individual users to obtain control over data and network. The Buffer Overflow which is one of the most frequently occurring security vulnerabilities on network. Buffer Overflow occurs while writing data to a buffer and it overruns the buffer's threshold and overwrites it to neighboring memory. The techniques to avoid buffer overflow vulne... View full abstract»

The effect of both shot and thermal noises on the performance of 1D/2D wavelength hopping/time spreading CDMA dynamic noisy is analyzed. The probability of error is calculated for general systems employing asymmetric prime-hop codes (APHCs). A comparison is held between the performance of dynamic 1D CDMA, 2D CDMA, and C²DMA correlation receivers under the effect of both shot... View full abstract»

In this paper, All Optical Half Adder design based on nonlinear characteristics of Semiconductor Optical Amplifier (SOA) is proposed. Sum output of this adder is implemented using SOA-MZI configuration and carry output is implemented using SOA assisted by filtering. To make output of both the gates compatible for logic levels, an EDFA with suitable parameters is included at the output end of AND g... View full abstract»

The response of scattering parameters for various filters at microwave frequency range is presented in this paper. Although applicable at any frequency, S-parameters are mostly used for networks operating at radio frequencies (RF) where signal power and energy considerations are more easily quantified than currents and voltages. The basic idea consists of considering the filter as a two port netwo... View full abstract»

The optical link suffers from degradation due to attenuation, increase of bit rate and due to increase in the propagation distance, it also depends on the characteristics of the optical laser source. The direct modulated laser (DML) source radiation parameters such as photon lifetime, optical confinement factor, and gain coefficient are some of the important parameters which affect the performance... View full abstract»

Optical fiber networks provide huge bandwidth to accommodate the rapid growth of Internet traffic. Due to bursty nature of the Internet traffic, optical burst switching (OBS) is highly suitable for metropolitan area networks compared to circuit switching. This paper devises and presents three new scheduling algorithms for OBS based metropolitan area networks capable of providing quality of service... View full abstract»

Directional antenna provides tremendous performance improvement in an ad hoc network. There are many applications such as multimedia and real time, which requires guaranteed QoS (quality of service) in the network. In this paper, we present QoS routing algorithm which finds a optimal path from source to destination as well as for other nodes in the network. Route discovery is initiated by source n... View full abstract»

With the growing use of Internet and its services, a large number of organizations are making use of it to provide and seek information of the people using those services. This has raised the chances of attacks on such services by interrupting them sending multiple requests to the servers providing these services programmatically. CAPTCHA (Completely Automated Public Turing test to tell Computers ... View full abstract»

Unmanned Aerial Vehicle (UAV) networks require successful mission execution, which is dependent on task planning and control. In this paper, we propose a distributed task allocation algorithm for a multi-UAV sensor network for sensing thorium intensities in the coastal areas of India. A power-aware coordination and planning approach is used to coordinate the activities of multiple UAVs. Depending ... View full abstract»

The low-voltage design is an effective method to decrease power consumption in a circuit. In this paper, a compact CMOS active inductor circuit is proposed. The circuit is based on the gyrator-C approach with both transconductance stages realized by MOS transistors. The proposed inductor is suitable for low voltage operation as it has minimum number of transistors and none of them suffers from bod... View full abstract»

Jamming-based denial of service attacks are a real threat in wireless sensor networks. This paper studies and analyzes the impact of jamming on micaz motes running TinyOS and explores ways to mitigate the impact. Jamming is facilitated by disabling carrier sensing on the jammer nodes. Jamming attack is detected by tracking RSSI and PDR at the receiver. By varying several parameters at the sender s... View full abstract»

Wireless communication systems play an increasingly integral role in society. Currently underground sensor networks are used in many applications for security purposes, environmental applications, infrastructure maintenance etc. The major problem, associated with sensor networks, is in providing the power supply to enable the networks to work for long durations. This paper presents a novel techniq... View full abstract»

The major drawback of multicarrier transmission such as Orthogonal Frequency Division Multiplexing (OFDM) and Wavelet Packet Modulation (WPM) is their high Peak-to-Average Power Ratio (PAPR). In this paper, we propose Genetic Algorithm (GA) based approach for the reduction of PAPR. The GA approach has proved to be an efficient optimization tool for the reduction of PAPR as well as the computationa... View full abstract»

Vehicular ad hoc network (VANET) has extensively used to enhance protection of the passengers and reduce occasion of traffic congestion. Consistent communication in vehicular ad-hoc networks is important to provide functional and reliable traffic safety and efficiency applications. Security is the major issue in the network due to the mobile nature of the vehicle. In this paper we proposed the nov... View full abstract»

In recent years, the exponentially increasing number of portable wireless devices has made it infeasible to authenticate each individual device of a group separately. With the current trend, the proliferation of devices in the future is said to accelerate further. Therefore, there is an urgent need for a reliable and secure authentication scheme that authenticates a group of devices at once. This ... View full abstract»

In this paper, outage performance of Decode-forward (DF) and Amplify-forward (AF) protocols in cooperative wireless communication is evaluated in terms of outage probability. In particular, a new outage analysis for AF protocol has been carried out. Results obtained using this analysis matches with the simulated results. Outage probability analysis helps in deciding whether the targeted quality of... View full abstract»