i-manager's Journal on Communication Engineering and Systems (JCS)


Volume 5 Issue 4 August - October 2016

Research Paper

Solving Network Congestion Problem by Quality ofService Analysis using OPNET

Furat N. Tawfeeq* , Mohammed A. Abdala**
* Assistant Lecturer, National Cancer Research Center, Baghdad University, Iraq.
** Associate Professor, Department of Networks Engineering, College of Information Engineering, AL-Nahrain University, Iraq.
Tawfeeq, F. N., and Abdala, M.A. (2016). Solving Network Congestion Problem by Quality of Service Analysis using OPNET. i-manager’s Journal on Communication Engineering and Systems, 5(4), 1-8. https://doi.org/10.26634/jcs.5.4.8201

Abstract

Among many problems that reduced the performance of the network, especially Wide Area Network, congestion is one of these, which is caused when traffic request reaches or exceeds the available capacity of a route, resulting in blocking and less throughput per unit time. Congestion management attributes try to manage such cases. The work presented in this paper deals with an important issue that is the Quality of Service (QoS) techniques. QoS is the combination effect on service level, which locates the user's degree of contentment of the service. In this paper, packet schedulers (FIFO, WFQ,
CQ, and PQ) were implemented and evaluated under different applications with different priorities. The results show that WFQ scheduler gives acceptable results comparing with others. Computer simulation has been performed to study and verify the above mechanisms in the performance enhancement using the OPNET simulator.

Research Paper

Analysis of Multi-User Interference in Pseudo-Noise DS-CDMA

Taye Tolu Mekonnen* , Tesfaye Mekonnen Zeleke**, Taye Aychiluhim Fenta***
* Lecturer, School of Electrical and Computer Engineering, Jimma University, Oromia, Ethiopia.
** Engineer, Electric Power Research Institute EPRI, USA.
*** Integration Engineer, Ericsson AB Ethiopia Branch, Addis Ababa, Ethiopia.
Mekonnen, T. T., Zeleke, T. M., and Fenta, T. A. (2016). Analysis of Multi-User Interference in Pseudo-Noise DS-CDMA. i-manager’s Journal on Communication Engineering and Systems, 5(4), 9-14. https://doi.org/10.26634/jcs.5.4.8202

Abstract

With the emergence of Code Division Multiple Access (CDMA), the communication world has been bestowed with state-of-the-art multiple access schemes that are used to allow many simultaneous subscribers to the same fixed bandwidth radio spectrum. The problem, however, is that there is a limit to the capacity and performance of this technique as Multiple Access Interference (MAI) stems along with this technology. Therefore, an analysis which basically focuses on the effect of this Multiple Access Interference is essential. The main goal of this work is to analyze the multiple access
interference in Direct-Sequence Code Division Multiple Access (DS-CDMA). It mainly focuses on the effects on the Bit Error Rate (BER) as a result of a change in Signal-to-Noise (SNR), which varies with the number of users assigned to a channel. The result of this study demonstrated that the probability of occurrence of an error in the received signals increase as the number of users sharing the same channel increases, maintaining other parameters constant. This is directly attributed to the fact that SNR decreases as the number of subscribers to the same channel increases. However, further analysis requires the due consideration of other parameters like external effects to decide on the optimum
number of users to share a given channel.

Research Paper

Modeling the Effect of Dispersion and Cross PhaseModulation in DWDM System

Prachi Agrawal* , Sharad Mohan Shrivastava**, Pooja Sharma***, Rahul Parganiha****, Anuja Mishra*****
*, ***-***** PG Scholar, Department of Communication Engineering, Chhattisgarh Swami Vivekanand Technical University, Bhilai CG, India.
** Assistant Professor, Department of Electronics and Telecommunication, Shri Shankarachrya Technical Campus, Bhilai CG, India.
Agrawal, P., Shrivastava, S. M., Sharma, P., Parganiha, R., and Mishra, A. (2016). Modeling the Effect of Dispersion and Cross Phase Modulation in DWDM System. i-manager’s Journal on Communication Engineering and Systems, 5(4), 15-22. https://doi.org/10.26634/jcs.5.4.8203

Abstract

This paper investigates the best modulation format among Non Return-to Zero (NRZ), Carrier-Suppressed Return-to-Zero (CSRZ) and Duo Binary (DB) modulation format for long haul transmission system and to find out the best dispersion compensation technique among the pre compensation, post compensation and symmetrical compensation scheme for the 16 channel DWDM (Dense Wavelength Division Multiplexing) system. The channel spacing between the channel is 200 Ghz and all the channel operates at 40 Gbps data rate. The best transmission modulation format is found by varying the signal input power and analyzing the eye diagram from the BER analyzer of the optiSystem software. It is found that DB modulation format with symmetrical compensation technique is the best method for the long haul data transmission. Analysis is done using Optiwave OptiSystem software. The objective of this paper is to compare three different modulation techniques for different modulation formats for long distance communication.

Research Paper

Optimization of Dual-Band BPF using Defected GroundStructure

Anjali Sachan* , Arvind Kumar Pandey**, R. K. Chauhan***
** Ph.D Scholar, Madan Mohan Malaviya University of Technology, Gorakhpur, India.
*** Professor, Department of Electronics and Communication Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur,India.
Sachan, A., Pandey, A. K., and Chauhan, R.K. (2016). Optimization of Dual-Band BPF using Defected Ground Structure. i-manager’s Journal on Communication Engineering and Systems, 5(4), 23-28. https://doi.org/10.26634/jcs.5.4.8204

Abstract

In this paper, a new Defected Ground Structure (DGS) is proposed with an aim to reduce the size of already existing filter and increase the fractional bandwidth of the band-pass filters. The proposed DGS is applied to the previously designed Dual-Band Pass Filter (BPF), which was operating at 2.45 GHz and 5.2 GHz. On using this defected ground structure, the operating frequency of the first pass band reduces from 2.45 GHz to 2.197 GHz, whereas operating frequency of second pass band reduces from 5.2 GHz to 4.8 Ghz. The increase in fractional bandwidth was also observed at first pass-band.
The size of the Dual-Band BPF with DGS is 0.11 λg × 0.21 λg , and size of Dual-Band BPF without DGS is 0.11λg × 0.23λg . The size of the Dual-Band BPF is therefore reduced to 8.69% after using the proposed DGS.

Review Paper

Wavelength Division Multiplexing and Demultiplexing using Photonic Crystal Multi Channel Add Drop Filter: A Review

Anamika Bhadra* , Vikas Sahu**, Sharad Mohan Shrivastava***, Anshu****, Anjali S. Sanghvi*****
*,****,***** M.Tech Scholar, Department of Electronics & Communication Engineering, Chhattisgarh Swami Vivekanand Technical University, Bhilai, India.
**-*** Assistant Professor, Department of Electronics & Telecommunication Engineering, Shri Shankaracharya Technical Campus, Bhilai, India.
Bhadra, A., Sahu, V., Shrivastava, S. M., Anshu and Sanghvi, A.S. (2016). Wavelength Division Multipiexing and Demultiplexing using Photonic Crystal Multi Channel Add Drop Filter: A Review. i-manager’s Journal on Communication Engineering and Systems, 5(4), 29-35. https://doi.org/10.26634/jcs.5.4.8205

Abstract

The need for higher communication medium is endless as the newer technologies have been came so far, and there is always a search for a more efficient and promising scheme as compared to the present system. The current communication system is the most modern mode of communication. Today, most of the transmission takes place in 1550 nm window. So, the purpose of this paper is to present the simulation of Wavelength Division De-Multiplexing using a Photonic Crystal four-Channel Drop filter, and design it for multi channel Add-Drop filter with Wavelength Division Multiplexing and De-multiplexing, as it can provide the result in 1530 nm to 1570 nm window, which is quite ideal for
present optical communication system. A crystal is a periodic arrangement of atoms and molecules and the pattern which the atoms and molecules are repeated in space is the crystal lattice. In the PhC, the atoms or molecules are replaced by macroscopic media with differing dielectric constants and the periodic potential is replaced by a periodic dielectric function. The Wavelength Division Multiplexing (WDM) is considered to be a propitious scheme for high capacity optical interconnects and communications.

Review Paper

Cantilever Force Sensor based on Photonic Crystals Ring Resonator: A Review

Anjali S. Sanghvi* , Vikas Sahu**, Sharad Mohan Shrivastava***, Anamika Bhadra****, Anshu*****
*,****,***** M.Tech Student, Department of Electronics & Communication Engineering, Chhattisgarh Swami Vivekanand Technical University, Bhilai, India.
**-*** Assistant Professor, Department of Electronics & Telecommunication Engineering, Shri Shankaracharya Technical Campus, Bhilai, India.
Sanghvi, A. S.,Sahu, V., Shrivastava, S. M., Bhadra, A., and Anshu (2016). Cantilever Force Sensor based on Photonic Crystals Ring Resonator: A Review. i-manager’s Journal on Communication Engineering and Systems, 5(4), 36-41. https://doi.org/10.26634/jcs.5.4.8206

Abstract

Photonic Crystals include hexagonal rings in a two dimensional photonic crystal silicon slab of hexagonal lattice integrated on microcantilevers for sensing applications. Ring resonator is arranged in between two silicon Photonic Crystals waveguides, i.e., bus and drop waveguides. The new ring-resonators were formed by removing holes of a hexagon from a two-dimensional silicon Photonic Crystals slab in a hexagonal lattice. The sensing characteristics of ring resonator at various position adjacent to the junction of the microcantilever and the substrate are investigated. Biomolecules trapped in a hole functionalized with molecule probes will make the wavelength shift of the resonant
peak. This paper aims at further improving two parameters: Quality Factor and Sensitivity by varying radius of the holes and lattice constant. Two-dimensional Finite Difference Time Domain method and Effective Refractive Index approaches are to be employed for performing simulation.