Harsukhpreet Singh

Performance Investigation of 40 GB/s DWDM over Free Space Optical Communication System Using RZ Modulation Format

We successfully demonstrate 40 GB/s 8 channels’ Dense Wavelength Division Multiplexing (DWDM) over free space optical (FSO) communication system. Each channel is transmitting 5 GB/s data rate in downstream separated by 0.8 nm (100 GHz) channel spacing with 1.8 GHz filter bandwidth. DWDM over FSO communication system is very effective in providing high data rate transmission with very low bit error rate (BER). The maximum reach of designed system is 4000 m without any compensation scheme. The simulation work reports minimum BER for Return-to-Zero (RZ) modulation format at different channels 1, 4, and 8 are found to be , , and at 4000 m distance, respectively. Sharp increase in BER occurs if data rate and distance increase up to 10 GB/s and 5000 m.

Performance Investigation of Reactive AODV and Hybrid GRP Routing Protocols under Influence of IEEE 802.11n MANET

In modern technology era, the endeavor of MANET is to provide proficient wireless communication by adopting adhoc routing functionality in mobile nodes. The MANET nodes result in frequent network topology changes, making routing a challenging task. In past, Reactive routing approaches are used as a popular technique that provides scalable solution to relatively large MANET networks, where Hybrid MANET routing algorithms are introduced comprises of both reactive and proactive routing properties. This work is an attempt towards a comprehensive performance evaluation of commonly used reactive AODV protocol with hybrid GRP routing algorithm under varying node density conditions in terms of QoS using OPNET Modeler 17.5 Academic.

Comparative Analysis of Energy Efficient Protocols for Prolonged Life of Wireless Sensor Network

The efficiency of Wireless Sensor Networks (WSNs) depends on the routing protocols used, since routing protocol provide the best possible data transmission route from sensor nodes to sink to save energy of nodes in the network. The clustering schemes enhance the network lifetime, raise the scalability and reduce the energy consumption of the sensor network. The work in this paper presents the comparative analysis of the energy efficient routing protocols for WSN such as SEP, TSEP and DSEP. The optimized routing protocol has been proposed on the basis of the network life time, stability and cluster head selection for efficient working of the sensor networks.

Performance Optimization of DCF-MAC Standard Using Enhanced RTS Threshold under Impact of IEEE 802.11n WLAN

Wireless Local Area Networks (WLANs) communication means gained widespread reception in recent years and widely used all over world due to its wireless fidelity feature with high data rates assets. With emerged multimedia application on wireless networks and the integration with other cellular networks, requires support for quality of service. In this paper, performance optimization of DCF based IEEE 802.11n WLAN is carried out in terms of QoS, by varying random RTS threshold using OPNET Modeler 17.5 academic. It is observed that WLAN behavior widely diverge in terms of QoS with variations in RTS threshold values.

Node-Mobility Sway in IEEE 802.11g MANET

The interconnections between the stations vary rapidly, due to the frequent movements of nodes in the MANET Network, resulting in frequent variation of network topology and consequently, introduce route failures in such networks. Accordingly, the issue of mobility-induced route failures needs to prevail over significantly in MANETs to provide effective internet access to mobile users without any disruption of services in conjunction with optimum QoS. This paper evaluates the role of node-mobility sway in AODV route information based IEEE 802.11g MANET incorporating OFDM radio network interfaces along with DCF-MAC protocol by means of OPNET ModelerTM.

Performance Evaluation of MAC- and PHY-Protocols in IEEE 802.11 WLAN

This work evaluates and compares the performance of IEEE 802.11 WLAN scenario by evaluating QoS parameters such as medium access delay, end to end delay and re-transmission attempts at data rate of 2Mbps by means of different mechanisms in PHY- & MAC-layers. The Point coordination function (PCF) and Distribution Coordination Function (DCF) of MAC layer together with mechanism used in Physical layer i.e. Frequency hopping- and Direct sequence- spread spectrum (FHSS & DSSS) are reported and investigated to provide better QoS using OPNET simulator.

Performance Enhancement of 16 Channels Back Haul DWDM OADM Ring Network Using Electronic Dispersion Compensation

In this paper, electronic dispersion compensation (EDC) based on minimum mean square error optimization has been employed to improve the performance of 16 channels, gigabit capacity, back haul DWDM OADM ring network.. It is observed that EDC significantly reduce BER by e-33 and improved Q2 dB by 3 dB, thus resulting in improved eye opening and considerably reduced inter-symbol interference.

Comparative Analysis of Route Information Based Enhanced Divide and Rule Strategy in WSNs

In wireless sensor network, routing data efficiently to the base station is a big issue and for this purpose, a number of routing algorithms are invented by researchers. Clustering plays a very important role in the design and as well as development of wireless sensor networks for well distribution of network and also to route data efficiently. In this paper, we had done the enhancement of divide and rule strategy that is basically route information protocol based upon static clustering and dynamic cluster head selection. Simulation results show that our technique outperforms DR, LEACH, and AODV on the basis of packet loss, delay, and throughput. INDEX TERMS Routing protocols, clustering, Coverage hole and energy hole.

Performance Enhancement of Multichannel Gigabit Rate Bidirectional WDM-PON Using RSOA and Optimized Modulation Format

Abstract This paper successfully demonstrates bidirectional wavelength division multiplexing passive optical network (WDM-PON) system for 32 channels, 0.8 nm (100 GHz) channels spacing with 3.5 GHz filter bandwidth. The system delivers 160 GB/s data rate and 80 GB/s data rate in downstream and upstream, respectively. The optical source for downstream data and upstream data is mode-locked laser at central office and reflective semiconductor optical amplifier (RSOA) at optical network unit. The maximum reach of designed system is 50 km without using any dispersion compensation scheme. This paper comprises comparison of series of modulation format in downstream and upstream such as SOLITON, NRZ, RZ, MANCHESTER, CSRZ and CRZ-DPSK and optimization of the performance of designed system. It has been observed that CRZ-DPSK/NRZ gives best performance in downstream and upstream transmission for designed system. The simulation work report of minimum BER is e−13 for CRZ-DPSK in downstream and e−16 for NRZ in upstream transmission in case of 32-channel bidirectional WDM-PON.

Performance Comparison of G.711 in different Efficiency Modes using ertps service flow

WiMAX (Worldwide Interoperability for Microwave Access) is currently one of the hottest technologies in broadband wireless access. The IEEE 802.16 wireless technology provides high throughput broadband connections over long distance. One of killer applications for the 802.16 is Voice over IP (VoIP) service; Voice over Internet Protocol (VoIP) is a vastly growing technology which enables the transport of voice data over Internet Protocol based networks. In this research paper we investigate the performance of VoIP traffic over WiMAX network. We analyzed the performance of VoIP codec G.711 in terms of jitter, delay & throughput by comparing different modes of efficiency. The simulation was done using OPNET Modeler 14.5 and simulation results found the efficiency mode in which VoIP codec performed better.