Showing papers by "Tripura Institute of Technology published in 2010"

Novel design of Address Generator for WiMAX multimode interleaver using FPGA based finite state machine

Abstract: Wireless technology is the fastest growing segment of the modern communication industry. The IEEE 802.16e standard, commonly known as mobile WiMAX, is the latest wireless technology that has promised to offer Broadband Wireless Access over long distance. The concept of OFDM is used in WiMAX to obtain high data rate in addition to reducing the effects like inter symbol interference and inter channel interference. It has proved to be the air interface for next generation Broadband Wireless System. In this paper, we present a finite state machine based novel technique to model the Address Generation circuitry of WiMAX multimode interleaver using VHDL on FPGA platform with all code rates and modulation schemes of IEEE 802.16e standard. Our approach provides better performance in terms of maximum operating frequency, use of flip-flops with negligible loss in terms of logic cells utilized compared to existing FPGA based implementations. Measured circuit parameters and software simulation of this model are also provided.

Design of QoS Routing Framework Based on OLSR Protocol

Abstract: Mobile Ad-hoc Networks (MANET) is the self organizing collection of mobile nodes. The communication in MANET is done via a wireless media. In order to support the growing need for multimedia and real time applications, QoS support has become essential. However it is a challenge to route QoS in wireless environment due to node’s dynamic nature and mobility. This paper aims towards efficient QoS routing using OLSR (Optimized Link State Routing) by enhancing the MPR (Multi Point Relay) selection criteria. Considering the QoS parameters of effective bandwidth and end-to-end delay, a new algorithm has been proposed to map the QoS parameters into a single numeric weight in order to select the MPR node. The simulation results establish the efficiency of the proposed methodology.

An Improved Route Maintenance Strategy for QoS Based AODV Routing Protocol

Abstract: The challenges of mobile ad hoc network are to maintain quality of services and performance. Many routing protocols like AODV discover routes whenever required by the source node and the benefit in doing so is that no prior knowledge of the topology is required. The AODV routing protocol is commonly and effectively used for mobile, ad-hoc nodes [4, 7, 8, 15, 22, 23]. So far, many maintenance strategies have been proposed on AODV to provide better QoS services [7, 10, 19, 21] performances. Some has used the radio propagation characteristics of mobile nodes in ad hoc network [12, 23] during route maintenance [22]. Some modification has been done on computation of delay parameter [16, 19, 22]. The other modification was on multi route selection during route discovery considering only delay as QoS parameter [5, 23]. This paper aims towards proposing a new route maintenance strategy with multiple options that will lead to better performance during link failure on a route. During route discovery and route reply procedure [26] two different QoS parameters considered here are delay and bandwidth. The routes should be selected during route discovery process. The route maintenance strategy may be applied to both the routes independently and simultaneously by the internal nodes where the link failure has occurred.