BITS Faculty Publications
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Item Wavelength conversion algorithm in an intelligent optical network from a multilayered approach(Optica Publishing Group, 2004) Chaubey, V.K.We aim to implement a new deterministic wavelength conversion algorithm in local area networks (LANs). The network has been studied from a layered approach, and we describe how it can be interpreted as both a trunk network and a LAN. The limitation on the total number of wavelength conversions that a packet can undergo on its path has been addressed. Our algorithm employs online routing methods to attribute intelligence to the network and thus provides an improvement in the call connection probability.Item Survivable routing with path length constraint in WDM networks(IJAER, 2016) Chaubey, V.K.Wavelength-routed WDM optical network has the tremendous capability of providing overgrowing needs of higher bandwidth to the end users. It uses preconfigured optimal lightpaths to carry the traffic of users from one node to another node. Hence, an intelligent RWA algorithms required to be employed to achieve better performance of the network. In this paper, we investigate the impact of path lengths in the RWA problem. We study the effect of length of the path in the blocking performance of network when working and protection paths computed for the resiliency to an occurrence of single link failure in WDM network. Proposed algorithms will optimize individual connection request. In this work, we have simulated and analyzed the relative performances of the three RWA heuristics algorithms for survivable routing and wavelength assignment problem named as Shortest Path Pair (SPP), Shortest Longest Path Pair (SLPP) and Longest Shortest Path Pair (LSPP) strategy. These algorithms have been compared based on the percentage of successful light-paths established. The proposed heuristic strategies described here differs from each other in the length of the path of working and backup path. The simulation results reveal that SPP algorithm always outperforms in terms of call blocking performance ratio. Hence, for better network performance survivable RWA algorithm ensure to consider a pair of the shortest path as a working and protection path.Item XOR-FREE Implementation of Convolutional Encoder for Reconfigurable Hardware(ACM Digital Library, 2016) Chaubey, V.K.This paper presents a novel XOR-FREE algorithm to implement the convolutional encoder using reconfigurable hardware. The approach completely removes the XOR processing of a chosen nonsystematic, feedforward generator polynomial of larger constraint length. The hardware (HW) implementation of new architecture uses Lookup Table (LUT) for storing the parity bits. The design implements architectural reconfigurability by modifying the generator polynomial of the same constraint length and code rate to reduce the design complexity. The proposed architecture reduces the dynamic power up to 30% and improves the hardware cost and propagation delay up to 20% and 32%, respectively. The performance of the proposed architecture is validated in MATLAB Simulink and tested on Zynq-7 series FPGA.