Volume 30, Issue 2, June 2015

QoT Aware Dynamic Routing and Wavelength Assignment Technique using Fuzzy Logic Controller in WDM Networks [Full Text]

Debajyoti Mishra and Dr. Urmila Bhanja

Abstract— Quality of Transmission (QoT) in a dynamic routing and wavelength assignment (DRWA) problem is a major or a challenging issue in wavelength division multiplexed (WDM) high speed transparent optical network. This paper proposes a novel QoT aware dynamic routing and wavelength assignment technique using fuzzy logic controller, which incorporates certain significant QoT parameters into account for the lightpath establishment refered in this work as QoT-aware-FDRWA. The heart of the algorithm is a fuzzy logic controller (FLC) that includes QoT parameters such as optical signal to noise ratio (OSNR), free channel availability (FCA) and hop count (HC) of different lightpaths as inputs for computation of the optimal lightpath output for a request establishment. In the proposed work, linear impairments such as polarized mode dispersion (PMD), amplified spontaneous emission noise (ASE), switch crosstalk (SC), and demultiplexer crosstalk (DC) are taken into consideration. The efficacy of the proposed algorithm is judged by the improvement of the average blocking probability. 

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Development of a Sign language Tutoring System for People with Hearing Disability [Full Text]

Bakpo, F.S and Ezugwu, O.A.

Abstract—This paper presents the development of a sign Language tutoring system using Markov Decision process model. The work provides computer based support for the deaf and hard-to-hearing people and is valuable in places where the number of qualified sign Language interpreters or technological assistance which enhanced accessibility is grossly inadequate or absent. The Markov Decision Process (MDP) model is applied to process sign movement signals and to verify if a trainee has closely replicated a human teacher’s sign movement. The system is designed using OOAD methodology and implemented using visual C# programming Language. An empirical study was then conducted using questionnaire to 50 trainees and 4 human teachers on usability. The result shows that both human interpreters (teachers) and trainees (students) were satisfied with the computer based approach than with traditional human based.

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Simulation of a communication system using Verilog Language [Full Text]

Saran M.L., Dr. T.C. Manjunath and Harsha Karamchandani

Abstract—MIMO systems are widely used in baseband communications and also play a major role in 4G technology. FPGA based implementations of MIMO systems provide an environment for testing and development of MIMO based communication systems. The proposed FPGA based MIMO system aims at developing a transmitter system consisting of source, encoder, interleaver, modulator and a receiver system consisting of ML detector, de-interleaver, decoder system and a noisy wireless channel which is represented by a wired channel to which error bits are given to mimic the noise. The above modules are going to be developed using Xilinx, simulated and integrated in to the FPGA kit. As a scope of future work the FPGA based MIMO communication system can also be modified and extended to calculate Bit error rate, SNR etc.