Research

My research interests are in the optimization of communication networks, where nonlinear (and sometimes nonconvex) optimization techniques can be applied with with great success. Much of my research work was undertaken under the supervision of my Ph.D. advisors A/Prof. Jamie Evans and Prof. Subhra Dey at The University of Melbourne.

Application areas where we have made contributions include cross-layer design for ad-hoc and sensor networks, dynamic spectrum management OFDM/DMT based networks (for example, as used in Digital Subscriber Lines), and resource allocation in CDMA cellular networks.

For a list of frequently asked questions, with answers, relating to my Ph.D research on DSL, please see the front page.

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Publications and Preprints

Thesis

J. Papandriopoulos, "Resource Optimization in Multiuser Communication Networks," Ph.D Thesis, The University of Melbourne, 2006.

Journal Papers

1. J. Papandriopoulos and J. S. Evans, "Band Preference Design Algorithms for Improved Iterative Water-Filling," IEEE Transactions on Signal Processing, in preparation.
2. J. Papandriopoulos and J. S. Evans, "SCALE: A low-complexity distributed protocol for spectrum balancing in multiuser DSL networks," IEEE Transactions on Information Theory, accepted for publication, 2006.
3. J. Papandriopoulos, S. Dey, and J. S. Evans, "Optimal and Distributed Protocols for Cross-Layer Design of Physical & Transport Layers in MANETs," IEEE/ACM Transactions on Networking, submitted, 2006.
4. J. Papandriopoulos, J. S. Evans and S. Dey, "Outage-Based Optimal Power Control for Generalized Multiuser Fading Channels," IEEE Transactions on Communications, vol. 54(4), pp. 693-703, Apr. 2006.
5. J. Papandriopoulos, J. S. Evans and S. Dey, "Optimal Power Control for Rayleigh-Faded Multiuser Systems with Outage Constraints," IEEE Transactions on Wireless Communications, vol. 4(6), pp. 2705-2715, Nov. 2005.

International Conference Papers

1. R. Timo, K. Blackmore and J. Papandriopoulos, "Strong Stochastic Stability for Dynamic Source Routing", Australian Telecommun. Networks and Applications Conf., Christchurch, New Zealand, Dec. 2007, to appear.
2. J. Papandriopoulos and J. Evans, "Band Preference Design Algorithms for Improved Iterative Water-Filling", IEEE Globecom, Washington DC, USA, Nov. 2007.
3. J. Papandriopoulos and J. Evans, "Low-Complexity Distributed Algorithms for Spectrum Balancing in Multi-User DSL Networks", IEEE International Conference on Communications, Istanbul, Turkey, Jun. 2006. Winner of the best paper award, Signal Processing Communications Symposium.
4. J. Papandriopoulos, S. Dey and J. Evans, "Distributed Cross-Layer Optimization of MANETs in Composite Fading," IEEE International Conference on Communications, Istanbul, Turkey, Jun. 2006.
5. T. Thanabalasingham, S. V. Hanly, L. H. Andrew and J. Papandriopoulos, "Joint Allocation of Subcarriers and Transmit Powers in a Multiuser OFDM Cellular Network", IEEE International Conference on Communications, Istanbul, Turkey, Jun. 2006.
6. J. Papandriopoulos, J. S. Evans and S. Dey, "Outage-Based Power Control for Generalized Multiuser Fading Channels," IEEE International Conference on Communications, Paris, France, vol. 1, pp. 327-331, Jun. 2004.
7. J. Papandriopoulos, J. S. Evans and S. Dey, "Iterative Power Control and Multiuser Detection with Outage Probability Constraints," IEEE International Conference on Communications, Anchorage, U.S.A, vol. 4, pp. 2509-2513, May 2003.
8. J. Papandriopoulos, J. S. Evans and S. Dey, "Optimal Power Control in CDMA Networks with Constraints on Outage Probability," Wi'Opt 2003: Modelling and optimization in mobile, ad-hoc and wireless networks, Sophia-Antipolis, France, pp. 279-286, Mar. 2003.

Australian Conference Papers

1. J. Papandriopoulos, J. S. Evans and S. Dey, "Distributed Power Control for Cellular MIMO Systems with Temporal and Spatial Filtering", Proc. 5th Australian Communications Theory Workshop, Newcastle, Australia, pp. 164-175, Feb. 2004.
2. J. Papandriopoulos, J. S. Evans and S. Dey, "Achieving Outage Probability Specifications through Power Control and Multiuser Detection," Proc. 4th Australian Communications Theory Workshop, Melbourne, Australia, pp. 53-60, Feb. 2003. Winner of the best student paper award.

Presentations

1. "Dynamic Spectrum Management for DSL---Going Beyond Iterative Water-Filling", FTW, Vienna, Austria, Aug. 14, 2007.
2. "Cross-layer design of MANETs: Distributed protocols for nonconvex problems... and other applications", Institute Eurecom, Sophia Antipolis, France, Aug. 8, 2007.
3. "Cross-layer design of MANETs: Distributed protocols for nonconvex problems... and other applications", Supelec, Paris, France, Jul. 31, 2007.
4. "SCALE: Dynamic Spectrum Management for DSL---Going Beyond Iterative Water-Filling", RWTH-Aachen, Germany, Jul. 18, 2007.
5. "SCALE: Dynamic Spectrum Management for DSL---Going Beyond Iterative Water-Filling" (invited talk), 8th Australian Communications Theory Workshop, Adelaide, Australia, Feb. 2007.
6. "Getting the most out of MANETs: Distributed Algorithms for Cross-Layer Optimization" (invited talk), 17th ITC Specialist Seminar, Melbourne, Australia, Apr. 2006.
7. "Cross-Layer Design of Ad-Hoc Networks: Non-Convex Optimization and Distributed Algorithms", Caltech (Prof. Stephen Low's group), USA, Nov. 18, 2005.
8. "Multi-User Spectrum Balancing: Beyond Iterative Water-Filling", Stanford University (Prof. John Cioffi's group), USA, Oct. 31, 2005.
9. "Solving Non-Convex Problems: Cross-Layer Design of Ad-Hoc Networks and OFDM/DMT Spectrum Balancing", Princeton University (Prof. Mung Chiang's group), USA, Oct. 19, 2005.
10. "Solving Non-Convex Problems: Cross-Layer Design of Ad-Hoc Networks and OFDM/DMT Spectrum Balancing", NEC Labs (Princeton), USA, Oct. 19, 2005.
11. "Cross-Layer Optimization of Wireless Ad-Hoc and Sensor Networks" (invited talk), Wireless Winter School, Canberra, Australia, Jul. 2005.
12. "Joint Power & Congestion Control in Multi-Hop Wireless Networks" (invited talk), ACoRN Workshop on Cross-Layer Design, Adelaide, Australia, Jun. 2005.
13. "Power Control in Wireless Networks" (invited talk), 5th Australian Communications Theory Workshop, Newcastle, Australia, Feb. 2004.
14. "Power Control, MUD and Outage Probability in CDMA" (invited talk), eCommerce & Distributed Systems Seminar, RMIT University, April 2003.
15. "Distributed Simulation in CUBINlab", CUBIN seminar, University of Melbourne, January 2003.

Posters

These are full-sized posters. You can zoom quite a long way to see the detail in diagrams, plots, etc.

1. J. Papandriopoulos and J. S. Evans, "Low-Complexity Distributed Algorithms for Spectrum Balancing in Multi-User DSL Networks", 7th Australian Communications Theory Workshop, Perth, Australia, Feb. 2006.
2. J. Papandriopoulos, S. Dey and J. S. Evans, "Cross-Layer Optimization for QoS in MANETs through Distributed Power and Congestion Control", 6th Australian Communications Theory Workshop, Brisbane, Australia, Feb. 2005.
3. J. Papandriopoulos, J. S. Evans and S. Dey, "Distributed Power Control for Cellular MIMO Systems with Temporal and Spatial Filtering", 5th Australian Communications Theory Workshop, Newcastle, Australia, Feb. 2004.
4. J. Papandriopoulos, J. S. Evans and S. Dey, "Achieving Outage Probability Specifications through Power Control and Multiuser Detection," 4th Australian Communications Theory Workshop, Melbourne, Australia, Feb. 2003.

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