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UB
wdbriz
Wireless & Mobile Communications (WMC) Laboratory
COMPUTER SCIENCE & ENGINEERING DEPARTMENT
 
Research Projects

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An Optimized Architecture of Overlay End-system Multicast (ESM) for Stable and Fast Streaming of Multimedia Applications

The main motive of this research project is to investigate the issues related to the implementation of Overlay End-System multicast (ESM) which is currently considered as a scalable alternative of IP multicast. Specifically, this research project will be primarily focused on the development of both analytical and mathematical models for all multicasting techniques such as unicast, multiple unicast, IP multicast, and overlay ESM. The proposed analytical and mathematical models provide an optimized architecture for the implementation of overlay ESM for the fast and stable streaming of multimedia applications. In addition, based on the proposed analytical and mathematical models, the research project will derive a closed-form expression for approximating both end-to-end delay and the required bandwidth. In this project, we will also evaluate the performance of different multicasting schemes such as unicast, multiple unicast, IP multicast, and end system multicasting. In order to perform the experimental verifications and performance evaluations, both simulation and numerical analysis of the multicast systems will be performed. Our analytical and mathematical study along with a comprehensive simulation and numerical analysis of multicasting approaches helps researchers to understand the effectiveness of this mechanism not only from the streaming media applications perspective but also from the network operation costs point of view.

Publications
  1. Syed S. Rizvi, Aasia Riasat, and Khaled M. Elleithy, "A Mathematical Model for Evaluating the Performance of Multicast Systems," The 1st IEEE International Workshop on IP Multimedia Communications (IPMC 2008) in conjunction 17TH International Conference on Computer Communications and Networks (ICCCN-08), August 4 - 7, St. Thomas U.S. Virgin Islands 2008.

  2. Syed S. Rizvi, Aasia Riasat, and Khaled M. Elleithy, "Performance Analysis of End System Multicast," IEEE International Workshop on Future Multimedia Networking (IEEE FNM 2008), Cardiff, Wales, September 18, 2008.
81228_00102

QoS of Multi-user communications for Cellular Networks

Multiuser detection is an important technology in wireless CDMA systems for improving both data rate as well as the user capacity. However, the computational complexity of this receiver prevents from the widespread use of this technique. Due to the high computational complexity, most of the CDMA systems today and in the near future will continue to use the conventional match filter with comparatively low user capacity and a slow data rate. However, if we could lower the computational complexity of multiuser detectors, most of the CDMA systems would likely to get advantage of this technique in terms of increased system capacity and a better data rate. The focus of our research is to reduce the computational complexity of multiuser receivers to improve the performance of multiuser detectors. Our research distinguishes itself in a number of ways. First, a new transformation matrix algorithm is used rather than the conventional linear transformation. Second, a mathematical model is proposed to produce consistent values of SNR for a wide range of users. Third, the performance measure adopted in this paper research is the achievable bit rate for a fixed probability of error (10-7).

Publications
  1. Syed S. Rizvi, Aasia Riasat, "A Low Complexity Optimum Multi-user Receiver for Maximizing the BER Performance for DS-CDMA Systems", accepted in Mosharaka International Conference on Wireless Communications and Mobile Computing (MIC-CCA 2008) Amman - Jordan, 5-7 June 2009.

  2. Syed S. Rizvi and Aasia Riasat, "Analyzing SNR Performance of a Low-Complexity Wireless Multiuser Receiver for DS-CDMA Systems, "12th IEEE International Multi-topic Conference (IEEE INMIC 2008), 23-24 December 2008, Bahria University Karachi, Pakistan.

  3. Syed S. Rizvi, Khaled M. Elleithy, and Aasia Riasat, "Transformation Matrix System for Reducing the Computational Complexity of Wireless Multi-user Receivers for DS-CDMA Systems," 5th International Conference on Information Technology: New Generations ITNG 2008, pp. 1251-1252, April 7-9, 2008, Las Vegas, Nevada, USA.

  4. Syed S. Rizvi, Aasia Riasat, and Khaled M. Elleithy, "A Closed Form Expression for BER of Synchronous DS-CDMA Multi-user Detector," 9th IEEE Wireless Telecommunication Symposium (IEEE WTS 2008), Pomona, California, pp. 110-114, April 24-26 2008.

  5. Syed S. Rizvi, Varsha Edla, and Aasia Riasat, "Bit Error Rate (BER) Analysis of Synchronous DS-CDMA Multiuser Receivers," The 9th INFORMS Telecommunications Conference: Telecommunications Modeling, Policy, and Technology, March 27-29, 2008. Robert H. Smith School of Business, University of Maryland, College Park, MD, 2008.

  6. Syed S. Rizvi, Aasia Riasat, and Khaled M. Elleithy, "Generation of High and Consistent values of SNR for Optimum Wireless Multiuser Receivers," accepted in The 4th IEEE International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2008). October 12 - 14, 2008 Dalian China.

  7. Syed S. Rizvi, Khaled. M. Elleithy, and Aasia Riasat, "Transformation Matrix Algorithm for Reducing the Computational Complexity of Multiuser Receivers for DS-CDMA Wireless Systems," Wireless Telecommunication Symposium (WTS 2007), Pomona, California, April 26-28 2007.
multiuser

Performance Optimization of Wireless Multi-user Receivers

This research project primarily aims to develop a new scheme for reducing the computational complexity of multiuser receivers to improve the processing gain and consequently reduce the multi-access interference. A deterministic formalization of the processing gain for a multiuser DS-CDMA system is presented. The formalization of the processing gain demonstrates that how the reduced BER could be used to achieve reasonable values of processing gain by which unwanted signals or interference can be suppressed relative to the desired signal at the receiving end. This research project not only is shown to substantially improve the performance of the multiuser detectors by means of reduced BER but also have a much lower multi-access interference.

Publications
  1. Syed S. Rizvi, Khaled M. Elleithy, and Aasia Riasat, "Deterministic Formalization of the Processing Gain for Reducing MAI in Wireless Multiuser DS-CDMA Systems," 5th Annual IEEE Consumer Communications and Networking Conference (IEEE CCNC'2008), pp. 859-860, January 10 - 12, 2008 in Las Vegas, Nevada.

  2. Syed S. Rizvi, Khaled M. Elleithy, and Aasia Riasat, "Formularization of Processing Gain (PG) with SNR for an Optimum Multiuser Receiver," accepted in International Symposium on Wireless Pervasive Computing (ISWPC-08) 2008, 7 - 9 May 2008 Santorini, Greece.

  3. Syed S. Rizvi, Khaled M. Elleithy, and Aasia Riasat, "The Impact of Reduced Computational Complexity of Multiuser Detectors on the Processing Gain in a Wireless DS-CDMA Multiuser System," Proceedings of the 2007 International Conference on Wireless Networks (ICWN'07). Part of the 2007 World Congress in Computer Science, Computer Engineering, & Applied Computing (WORLDCOMP'07), pp. 70 - 76, Las Vegas, Nevada, USA, June 25-28, 2007.

  4. Syed S. Rizvi, Khaled M. Elleithy, and Aasia Riasat, "Use of Processing Gain to Suppress Multi Access Interference (MAI) in CDMA Based Multiuser Receiver," International Wireless Communications and Mobile Computing Conference 2007 (IWCMC 2007), August 12-16, 2007, Honolulu, Hawaii (Accepted but not Presented)
hypercube12d

Faulty Links Optimization and Load-scalability in Hypercube Networks

The nodes or processors in a hypercube networks send random point-to-point messages to other nodes in the network. We assume that a node can generate at most one message per cycle time with a global clock algorithm that drives all processors. The primary objective of this research project is to simulate the data throughput and hot spot properties of a hypercube network. In this research, we aim to develop a simple stored and forward one-bit round robin routing algorithm for transmitting and receiving messages between the nodes within the hypercube network. One of the main objectives of this research project is to demonstrate that the proposed routing algorithm not only works in an ideal situation where all the communication links between the nodes are in the operational mode but also works fine in the presences of faulty links. Furthermore, the goal is to implement the designed stored and forward one-bit round robin routing algorithm that can show some good load-scalability characteristics among the hypercube nodes. In addition, the effects of different architectures such as the dimension of the hypercube network, input parameter values, and the introduction of faulty links are evaluated in this research work.

Publications
  1. Syed S. Rizvi, Khaled M. Elleithy, and Aasia Riasat, "An Efficient Single Bit Store and Forward (SBSF) Routing Algorithm for Mesh-Hypercube (M-H) Networks," The 2008 World Congress in Computer Science, Computer Engineering, and Applied Computing WORLDCOMP'08. Las Vegas, Navada. pp. 69 - 75, July 14 - 17, 2008. [PDF]
WSNsim

Resource Optimization in Wireless Sensor Network

A sensor network is made up of numerous small independent sensor nodes with sensing, processing and communicating capabilities. The sensor nodes have limited battery and a minimal amount of on-board computing power. This primary objective of this research work is construct a methodology that utilizes source and path redundancy techniques with the intention to efficiently reduce the required energy consumption while maximizing the lifetime of the sensor network. In addition, the developed methodology presents a strategy to optimize the number of active sensor nodes and assign equal time slots to each sensor nodes for sensing and communication with Base Station (BS).

Publications
  1. Allon Rai, Sangita Ale, Syed Rizvi and Aasia Riasat," A New Methodology for Self Localization in Wireless Sensor Networks," 12th IEEE International Multitopic Conference (IEEE INMIC 2008), 23-24 December 2008, Bahria University Karachi, Pakistan.

  2. Syed S. Rizvi, Aasia Riasat, "Use of Self-Adaptive Methodology in Wireless Sensor Networks for Reducing Energy Consumption," IEEE International Conference on Information and Emerging Technologies (ICIET-2007), pp. 1 - 7, July 06-07, 2007, Karachi, Pakistan. [PDF]

  3. Syed S. Rizvi, Khushboo Patel, and Chaitali Patel, "Use of Self-Adaptive Methodology in Wireless Sensor Networks for Reducing the Energy Consumption", International Conference on Telecommunications and Networking (TeNe 07), Bridgeport, CT, USA. December 3 - 12, 2007.

  4. Syed S. Rizvi, Khushboo Patel, and Chaitali Patel, and Khaled M. Elleithy, "An Approach to Reduce the Energy Consumption in Wireless Sensor Networks through Active Nodes Optimization," 2007 NEW ENGLAND AMERICAN SOCIETY FOR ENGINEERING EDUCATION CONFERENCE, April 20-21, 2007. (Accepted & Presented & Published on CD). [PDF]

Mobile Ad Hoc Networks (MANET)

PROJECT-1: MINIMIZING MALICIOUS BEHAVIOR OF MOBILE NODES IN MANET

The primary objective of this research project is to reduce the malicious behavior of mobiles nodes in MANET. To achieve this objective, we have proposed a new scheme, Reputation-Trust (RT) System, which can be used to stabilize the performance of network even in the presence of large number of malicious nodes. Specifically, we introduced two extensions to the Dynamic Source Routing (DSR) protocol to mitigate the effects of routing misbehavior. We are currently working on the simulation and numerical analysis of the proposed RT system. Our simulation will cover different network scenarios with varying network performance parameters such as packets size, latency, and the average bandwidth.

Publications
  1. Ashish Vekaria and Syed S. Rizvi, "A New Efficient Routing Approach for Mobile Ad Hoc Networks (MANET)," The 9th INFORMS Telecommunications Conference: Telecommunications Modeling, Policy, and Technology, March 27-29, 2008. Robert H. Smith School of Business, University of Maryland, College Park, MD. [PDF]

  2. Varsha Edla and Syed S. Rizvi "REPU-TRUST Algorithm: An Efficient way for Minimizing the Malicious Behavior of Mobile Nodes in Ad Hoc Networks," The 9th INFORMS Telecommunications Conference: Telecommunications Modeling, Policy, and Technology, March 27-29, 2008. Robert H. Smith School of Business, University of Maryland, College Park, MD. [PDF]

  3. Syed S. Rizvi, "An Efficient 3-Phase Algorithm for Capacity Analysis of Mobile Ad Hoc Networks (MANET)," The 12th World Multi-Conference on Systemics, Cybernetics and Informatics (WMSCI 2008) jointly with The 14th International Conference on Information Systems Analysis and Synthesis (ISAS 2008), June 29th - July 2nd, 2008 - Orlando, Florida, USA

  4. Syed S. Rizvi, Saroj Poudyal, Varsha Edla, and Ravi Nepal, "A Novel Approach for Creating Trust to Reduce Malicious Behavior in Mobile Ad Hoc Networks (MANET)," submitted in 3rd International Conference on emerging Networking Experiments and Technologies (CoNEXT), Columbia University, New York, NY, December 10 -13, 2007. [PDF]

  5. Syed S. Rizvi, Saroj Poudyal, Varsha Edla, and Ravi Nepal, "Reducing Malicious Behavior of Mobile Nodes in Ad Hoc Networks," International Conference on Telecommunications and Networking (TeNe 07), Bridgeport, CT, USA. December 3 - 12, 2007.
  6. Khurram M. Rajput, Khaled M. Elleithy, and Syed S. Rizvi, "A Novel Approach for Creating Consistent Trust and Cooperation (CTC) among Mobile Nodes of Ad Hoc Network," International Conference on Telecommunications and Networking

PROJECT-2: CAPACITY ANALYSIS OF MANET

The primary objective of this project is to develop an efficient algorithm that can be used to analyze the best and worst cast capacities of a MANET. The capacity of MANET is typically determined by the size of network, routing protocol, mobility and the interactions that occur between the mobile nodes. Moreover, these critical parameters cause the loss rate that has severed impact on the performance of the MANET. Therefore, one of the main objectives of this research project is to develop an analytical model that incorporates most of the critical parameters that can influence the capacity of MANET. In addition, in this research project, based on the algorithm and the analytical model, we will design and implement the simulation to approximate both the best and worst case capacities of MANET with the consideration of relaying and non-relaying nodes.

Publications
  1. Syed S. Rizvi, Aasia Riasat, Khaled M. Elleithy, and Mustafa Khan, "The Worst and Best case Capacity Analysis of Mobile Ad Hoc Networks (MANET) using a 3-Phase Algorithm," The 5th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad hoc Communications and Networks: IEEE SECON 2008. Page(s):594 - 596 June 16-20, 2008, San Francisco Bay Area, 2008. [PDF]

  2. Syed S. Rizvi, Muhammad S. Rashid, and Aasia Riasat, "A New Efficient 3-Phase Algorithm for Performing Capacity Analysis of Mobile Ad Hoc Networks (MANET)," The 9th INFORMS Telecommunications Conference: Telecommunications Modeling, Policy, and Technology, March 27-29, 2008. Robert H. Smith School of Business, University of Maryland, College Park, MD. [PDF]

Performance Optimization of Conservative and Optimistic Time Management Algorithms (TMA) in Parallel and Distributed Discrete-event Simulation Systems

In this research project, our main goal is to explore both conservative and optimistic time management algorithms (TMA) of parallel and distributed discrete-event simulation systems. One of the main problems associated with distributed simulation is the synchronization of distributed execution. If not properly handled, synchronization problems may degrade the performance of a distributed simulation environment. This situation gets more severe when the synchronization algorithm needs to run to perform a detailed logistics simulation in a distributed environment to simulate a huge amount of data. One of the primary objectives of this research work is to optimize the performance of conservative TMA in a parallel and distributed system by minimizing the transmission overhead within a large scalable simulation. In addition, the focus of our research is to explore the optimistic TMA in such a way that we can overcome some of the deficiencies of this TMA such as reducing the latency for computing global virtual time (GVT), fast and accurate GVT computation, and enhancing the overall system throughput. To achieve this task, we will examine the potential use of tress and butterflies barriers with the optimistic TMA. In other words, our objective is to combine synchronous algorithm with the optimistic TMA.

Publications
  1. Syed S. Rizvi and Aasia Riasat, "Reducing Null Message Traffic in Large Parallel and Distributed Systems," 13th IEEE Symposium on Computers and Communications (ISCC'08), July 6 - 9, 2008, Marrakech, Morocco. . Received Best Paper Award. [PDF]

  2. Syed S. Rizvi and Aasia Riasat, "A New Architecture for Minimizing the Transmission Overhead for Large Parallel and Distributed Networks," The 2008 World Congress in Computer Science, Computer Engineering, and Applied Computing. WORLDCOMP'08 - Las Vegas, Navada. pp. 270-276, July 14 - 17, 2008. [PDF]

  3. Syed S. Rizvi and Aasia Riasat, "Optimizing the Performance of Null Message Algorithm (NMA) for Large Parallel and Distributed Networks," The 9th LCI International Conference on High Performance Clustered Computing, National Center for Supercomputing Applications University of Illinois, Urbana, Illinois, USA, April 29-May 1, 2008.

  4. Syed S. Rizvi and Aasia Riasat, "Performance Optimization of Large Parallel and Scalable Distributed Systems Using Trees and Butterflies Barriers with Optimistic Synchronization Algorithms," The 9th LCI International Conference on High Performance Clustered Computing, National Center for Supercomputing Applications University of Illinois, Urbana, Illinois, USA, April 29-May 1, 2008.

  5. Syed S. Rizvi, Khaled M. Elleithy, and Aasia Riasat, "A New Mathematical Model for Optimizing the Performance of Parallel and Discrete Event Simulation Systems," 11th Communications and Networking Simulation Symposium (CNS'08), Part of the 2008 Spring Simulation Multiconference (SpringSim'08). April 14-16, 2008. Crowne Plaza Ottawa, Ottawa, Ontario. [PDF]

  6. Syed S. Rizvi, Khaled M. Elleithy, and Aasia Riasat, "Trees and Butterflies Barriers in Distributed Simulation System: A Better Approach to Improve Latency and the Processor Idle Time", IEEE International Conference on Information and Emerging Technologies (ICIET-2007), pp. 1 - 6, July 06-07, 2007, Karachi, Pakistan.

  7. Syed S. Rizvi, K. M. Elleithy, Aasia Riasat, "Minimizing the Null Message Exchange in Conservative Distributed Simulation," International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering, CISSE 2006, pp. 443-448 ,December 4-14, Bridgeport CT, 2006. [PDF]

  8. Lee A. Belfore, Saurav Mazumdar, and Syed S. Rizvi et al., "Integrating the joint operation feasibility tool with JFAST," Proceedings of the fall 2006 Simulation Interoperability Workshop, Orlando Fl, September 10-15 2006. [PDF]

Packet Switching and ATM Networks

This research projects deals with high performance packet switching and ATM networks. The focus of this research work is primarily on the development of new architectures, algorithms, and methodologies for providing efficient traffic management in ATM networks, high bandwidth and stable congestion control in the packet switching networks.

Publications
  1. Syed S. Rizvi, Aasia Riasat, and Muhammad S. Rashid, "A New Methodology for Efficient Traffic Management in ATM Networks for ATM Switching Systems," The 9th INFORMS Telecommunications Conference: Telecommunications Modeling, Policy, and Technology, March 27-29, 2008. Robert H. Smith School of Business, University of Maryland, College Park, MD [PDF]

  2. Syed S. Rizvi, Aasia Riasat, Muhammad S. Rashid, and Khaled M. Elleithy, "Bandwidth Problem in High Performance Packet Switching Network," International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering (CISSE 07), Bridgeport, CT, USA. December 3 - 12, 2007. [PDF] [Audio Presentation]

  3. Syed S. Rizvi, Aasia Riasat, and Muhammad S. Rashid, "A New Methodology for an Efficient Congestion Control in High Performance Packet Switching Networks," The 9th INFORMS Telecommunications Conference: Telecommunications Modeling, Policy, and Technology, March 27-29, 2008. Robert H. Smith School of Business, University of Maryland, College Park, MD [PDF]

  4. Syed S. Rizvi, Aasia Riasat, Muhammad S. Rashid, and Khaled M. Elleithy, "An Efficient Scheme for Traffic Management in ATM Networks," International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering (CISSE 07), Bridgeport, CT, USA. December 3 - 12, 2007. [PDF] [Audio Presentation]
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