The VPQ scheduler in access point for VoIP over WLAN

The Voice over Internet Protocol (VoIP) application has observed the fastest growth in the world of telecommunication.VoIP is seen as a short-term and long-trem transmission for voice and audio traffic. Meanwhile, VoIP is moving on Wireless Local Area Networks (WLANs) based on IEEE 802.11 standards.Currently, there are many packet scheduling algorithms for real-time transmission over network.Unfortunately, the current scheduling will not be able to handle the VoIP packets with the proper manner and they have some drawbacks over real-time applications.The objective of this research is to propose a new Voice Priority Queue (VPQ) packet scheduling and algorithm to ensure more throughput, fairness and efficient packet scheduling for VoIP performance of queues and traffics.A new scheduler flexible which is capable of satisfying the VoIP traffic flows.Experimental topologies on NS-2 network simulator were analyzed for voice traffic. Preliminary results show that this can achieve maximum and more accurate VoIP quality throughput and fairness index in access point for VoIP over WLANs.We verified and validated VPQ an extensive experimental simulation study under various traffic flows over WLANs

Development of a programmable integrated switch matrix (PRISM).

This research project involved the development of a fully customizable, user-defined hardware-software suite for automated signal routing with function expandability. Because of the above-mentioned characteristics, the project was called Programmable Integrated Switch Matrix (PrISM). This intelligent switching system can be customized and employed in any industry where there is a need for programmable, timed, and/or simultaneous routing of analog or digital signals between devices. Potential applications of these automated switching systems include, but are not limited to: demarcation points, test floors, redundant backup systems, remote maintenance, etc. A suitable test bed for PrISM was found in a collaboration with the Federal Aviation Administration (FAA) Oklahoma Communications Engineering Team (OKCET) Laboratory and has found an immediate potential application as a large-scale switching system. The fundamental hardware unit for this system is the National Instruments (NI) PXI chassis with a NI SwitchBlock populated with matrix relay cards. The chassis can be deployed in any location, contributing to the robust nature of the design. The advantage of using an integrated NI system is its modularity; the hardware can be easily tailored to the specific needs of each end user. Expansion and customization is accomplished with the addition of a wide spectrum of matrix relay cards. Matrix cards are available with a varying number of relays or switching points. The proposed system is controlled and automated by a customized virtual instrument (VI) application software that was developed using NI LabVIEW software environment and can be integrated with the PXI or function as an executable on a standalone desktop computer