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    Personal information
    Contact information
    Candidate Profile
     Date Submitted:21-06-2011
     Last Modified:21-06-2011 (07:05)
    Job information
     Current job:Principal Engineer
     Employment Term:Permanent
     Job location:Anywhere
     Date available:immediately
     Industry:Civil Agencies/International Organizations, Satellite Manufacturers and Subcontractors, Satellite Operators, , , Consulting/Engineering Services, Space Tourism
     KeywordsR&D ,space & satellite systems, network optimization, system design, VSAT, aeronautical communications

    experience summary

    International Expert on Satellite & Space Communications

    15+ Years of R&D and design experience in space & satellite systems



    EU Citizen (Cypriot)





    University of Surrey, (Centre for Satellite Engineering Research), U.K.

    Ph.D., (Elec. Engineering), June 1995

    Dissertation: “Design and Performance Optimization of Multiple Access Protocols for Multi-service VSAT Networks.”


    University of California, Irvine, USA

    M.S., (Elec. Engineering), January 1991


    University of Cambridge, U.K.

    M.A. (Honours), (Electrical and Information Sciences),June 1989


    academic honors

     & awards


    • Cambridge Commonwealth Trust Scholarship Award for study at the University of Cambridge (1986-1989)
    • Fulbright Scholarship (CASP Program)for postgraduate research in the United States (1989-91)
    • Research FellowshipAward to conduct research at the University of Surrey, from U.K. Engineering & Physical Sciences Research Council (EPSRC) (1992-95)
    • Visiting FellowshipAward to work for one year at a Government Laboratory, from Canadian National Science and Engineering Research Council (1995-1996)


    employment history


    Principal Consultant, Celestial Expert, (Sept. 2009 – Present)

    • Providing Consulting services to Telecommunications & Aerospace industry

    • Participating & assisting in Proposal Preparation for EU FP7 programs and related activities

    • Developing Educational Courses on Satellite & Space Systems


    Principal Communications Engineer, ITT Industries, AES (Oct. 2007 – July 2009)

    • Leading R&D efforts in the area of wireless and hybrid communication networks for DoD, NASA and FAA clients

    • Leading the technical proposal effort and working on issues related to FAA’s NextGen DataComm program.

    • Participating in capture activities and proposal preparation for federal agency programs.


    Adjunct Professor, (Sept. 2006-Present) / Assistant Research Scientist, (Nov. 1996- Sept. 2006)

    University of Maryland, College Park

    • Member of faculty of the Institute for Systems Research,

    Center for Satellite & Hybrid Communication Networks (CSHCN).

    Main Duties:

    • Conducted research on issues related to the performance optimization of satellite and wireless communication networks.

    • Advised and managed research students,participated in teachingof graduate students.

    • Coordinated research activities with industry and government R&D laboratories.

    • Led proposal preparation effort and was responsible for deliverables for funded research.


    Visiting Research Scientist, (September 1995-Ocober 1996), CRC Canada

    Communication Systems / Satellite & Space Applications & Projects Division,

    Canadian Government Communications Research Center, Industry Canada.


    Research Fellow, (January 1992 - June 1995), CSER, Un. of Surrey, UK

    Center for Satellite Engineering Research (CSER), University of Surrey, U.K.



    affiliations & recognition




    • Member, Institute of Electrical & Electronic Engineers (IEEE).

          •  Elected Secretary of IEEE Satellite& Space Communications Technical Committee.

    • Member, American Institute of Aerospace & Aeronautics (AIAA).

    • Has been listed in International Who’s Who of Inform. Technology, Who’s Who in Electrical Engineering andWho’s Who in the World

    work experience

    Design and Support of Communication needs of NASA Missions: Studies of intelligent architectures and related networking/coverage/interference/traffic load and security issues in order to support current and future requirements of NASA missions.

    Dynamic Bandwidth Allocation in Broadband Networks: Development of optimal policies for supporting various services with specific QoS.

    • Security and Reliability in Wireless/Hybrid Networks:  Protocol security, authentication / key distribution, threat and vulnerability risk assessments, ensuring resource availability.

    Internet protocols (TCP/IP) over wireless and space systems: Performance analysis, performance enhancement proxies, interconnection of hybrid (wired/wireless) networks.

    Satellite Constellation Design:LEO/MEO/GEO systems, trade-off studies for switching on the ground or on-board switching, network topology options, coverage, hand-off, congestion control, routing and load balancing with inter-satellite links.

    • Delay Tolerant Networks: Routing capable of operating efficiently with frequently disconnected, pre-scheduled, or opportunistic link availability, high link error rates, and networking in environments where round-trip-times may be large.

    Mobile Tactical Communications. Satellite and wireless hybrid architectures for secure information dissemination, ad-hoc networks for tactical units on the move.

    • Networking for Sensor Webs: Energy optimization and routing in distributed wireless (or space) networks; cross-layer issues in sensor networks.






    Participated in (and on the list of evaluators for) grant award assessment and research program evaluation for:

    •  Canadian Ministry of Industry:  Ka-band Satellite Communication Program

    US Government Programs: US Department of Defense Programs, NASA Communication Computing and Information Technology Program, NASA Commercialization of Space Technology.

    European Commission Programs: European Commission Information Society and Media Directorate: ICT for Sustainable Growth Program.


    Experience in Standards


    Participated and played a leading role in standardization activities and committees such as the IETF, the ATM Forum, IEEE, AIAA, RTCA and the US Telecom Industry Association.





    • Serving on the Editorial Board of the International Journal of Satellite Communications (Published by Wiley).

    • Serving on the Editorial Board of Space Communications (Published by IOS Press).

    • Regularly reviewing papers for IEEE, IEE, ACM and AIAA Journals and Conferences in the area of Communications and Networking

    • Organized and Chaired the IEEE Globecom 06 Satellite & Space Communications Symposium.




    • Extensive (15 years) experience with advising and supervision of research students.

    • Participation in teaching undergraduate, graduate and professional short courses on:

    • Wireless Communications
    • Wireless Sensor Networks
    • Satellite Communications

    for the University of Maryland, College Park.


    computer skills


    Simulation Packages:

    Extensive experience with discrete event simulation (using OPNET Modeler) for performance modeling and optimization of networks and experience in managing large modeling projects.

    • Experience with satellite coverage/orbit simulation packages such as Satellite Tool Kit, MATLAB.

    Other Software/Programming Skills: Exposure to a number of programming languages and extensive expertise in a wide range of office, engineering and design software.















    Technical Experience


    Principal Investigator in Government, Industry and International projects:


    Supporting Space Communication Needs of NASA Enterprises (funded by NASA):


    1. Flexible and Secure Access to Space

    - Evaluated alternatives for more efficient and dynamic ways to communicate with NASA missions, enabling scientists to access data "anytime, anywhere" through the Internet.

    - Investigated dynamic multiple access techniques for an "on-demand" operational scenario and required modifications of the Ground Network that will enable more efficient access.

    - Looked into security, traffic analysis and QoS support issues for this architecture.


    2. Design of Multilayer Architectures for Lunar Exploration

    • Provided technical support to the NASA Space Communications Architecture Working Group, providing analysis, performance evaluation and critiques of proposed communication architectures in support of the Lunar exploration and plans for the Mars exploration.
    • Developed a simulation model for a Hybrid Space Network that consisted of:
      • Networks of Mobile Rovers on planetary surface
      • Sensor Nets on surface and in orbit
      • Orbital Scientific Spacecraft
      • Relay Satellites
      • Ground Gateways (Earth and Planets).
    • Performed availability, coverage, protocol support and traffic multiplexing analysis.
    • Worked with the NASA Network Security subgroup, providing support and architectures for communication and network security in a space environment.


    1. Development of a Space Network Simulation Platform

    Developed a networking simulation platform that could enhance NASAs GSFC Distributed Simulation Environment for mission analysis. Our goal was to address specific mission requirements directly and provide solutions that will enable the simplest, most cost-effective delivery of science data when and where needed. For this purpose we

    • Developed a discrete event modular simulation platform based on OPNET Modeler that included:
      • The NASA DSN Network and the TDRS Relay Network
      • Other potential relays using commercial satellite constellations
      • Other potential Direct-to-Ground Relays
      • The International Space Station (ISS)
      • Models of typical mission spacecraft (such as MMS and TERRA) and detailed orbital models using the Satellite Tool Kit (STK) for the above spacecraft.
    • The model includes network elements such as traffic generation, layered protocol support, MAC layer and physical channel and antenna properties.


    4. Communication requirements for constellation/formation flying space missions and planetary sensor nets

    -Addressed the communication requirements for constellation space missions and planetary sensor networks.

    -Developed the framework for studying the operational communication trade-offs for typical constellation missions. Developed a simple prototype dynamic routing algorithm for this type of mission.

    - Investigated energy efficiency issues in sensor networks at all levels, from hardware to application level, as well as energy efficient algorithms for maximizing throughput and optimizing other metrics such as mission lifetime.


    4. System Engineering for supporting the International Space Station (ISS)

    • Investigated the feasibility of using existing commercial fixed ground Ka-band terminals for ISS communications in the near future, and performed a trade-off analysis between this option versus building new ground terminals at optimally placed locations.
    • Performed a coverage/availability analysis for terminal location, link budget analysis and traffic analysis for a client in the oil exploration business that needed a particular imaging service support from the ISS.


    5. Broadband Support for a Satellite-based Aeronautical Communication Network

    - Studied the current National Air Space communication system and FAA modernization program plans, and worked in defining the communication requirements for a satellite-based solution to broadband aeronautical communications

    - Designed an efficient and reliable transport layer protocol for aeronautical satellite networks that maintains high utilization of the satellite link and improve fairness among competing TCP connections.


    6. Development of Standards for Space-friendly TCP in an IPSEC environment

    • Worked with NASA, the US Telecom Industry Association (TIA) committee TR 34.1 and US industry to investigate satellite friendly solutions for TCP support for future IPv6 network supporting IPSEC.


    Experience in commercial SATCOM programs:


    • Dynamic bandwidth allocation and protocol design for a VSAT network integrating Voice and Data services (funded by UK EPSRC):

    • Design of Dynamic TDMA/TDM Multiple Access solutions.
    • Aloha-Based dynamic bandwidth Allocation for Star topology
    • Voice/Data integration for CELP coded voice over digital network

    • Design and performance optimization of the first European Ka-Band VSAT Network (funded by European Space Agency):

    • OLYMPUS Ka-band satellite link budget and coverage analysis
    • CODE Experimental VSAT Network design and optimization issues
    • CODENET Pan-european VSAT Educational Network design/deployment and traffic analysis for multimedia and Internet traffic.

    Design and Protocol optimization of first European ATM Network implementation – CATALYST Project (funded by European Union RACE, ACTS Programs):

    - Worked with ALCATEL and partners in optimizing traffic performance for data and multimedia service integrating B-ISDN islands across Europe using Satellites.

    Canadian Advanced Satellite Communications Program (funded by Canadian Government/ Ministry of Industry):

    - Worked with Canadian industry in developing requirements and evaluating design options (coverage issues, traffic and protocol support) for a next generation Ka-band satellite system.

    Handover studies for the ODYSSEY MEO Ka-band System (funded by TRW & Teleglobe):

    - Developed a simulation model and performed a handover analysis study of the final design of the ODYSSEY MEO Ka-band System, developed by TRW.

    Gateway and Performance Enhancement Proxy Design for the AstroLink System (funded by Lockheed Martin):

    • Design of TCP/IP enhancements and gateway protocols for an IP-based Ka-band broadband satellite network.
    • Development of a satellite–friendly Performance Enhancement Proxy for Internet over satellite.

    Networking Issues for IP Enabled Spacecraft (funded by NASA Glenn Research):

    • Working with Orbital Sciences, performed a trade study and suggested hardware solutions that will enable NASA to transition to an IP-capable mission spacecraft environment.
    • Performed a coverage, traffic, mobility support and security analysis of the IP network able to support spacecraft with an IP router on board.

    Advanced Telecommunications/Information Distribution Research Program (funded by US Army Research Lab (ARL )):

    • Developed a simulation model of a multi-hierarchical hybrid network consisting of satellites/UAVs/mobile vehicles and tactical units focusing on information dissemination in tactical operations.
    • Performed studies on security, information integrity, service integration, and routing support.

    Tactical support of Mobile Units using commercial satellite bandwidth (funded by CECOM/U.S. Army Space & Terrestrial Communications Directorate):

    - Investigated the development of a prototype Ka-band terminal that could be used to support communications on-the-move and on-the-pause for mobile tactical army units utilizing commercial satellite capacity.

    - Performed security/bandwidth availability/coverage and protocol support analysis.

    Optimization of two-way broadband satellite system (funded by Hughes Networks Systems):

    • Developed solutions dealing with NOC congestion, traffic analysis and PEP optimization for the HNS DirecWay broadband satellite service.
    • Investigated solutions for speed enhancement using caching techniques.
    • Investigated security issues and their implication on end-to-end system performance.


    More details on past projects can be found at:


    Thesis & Dissertation


    • Hadjitheodosiou, M.H., “An Adaptive Multi-access Protocol for a Land-Mobile Satellite System Using a Free-Access, Multiple Channel Collision Resolution Algorithm”, M.S. Thesis, University of California, January 1992.


    • Hadjitheodosiou, M.H., “Design and Performance Optimization of Multiple Access Protocols for Multiservice VSAT Networks”, Ph.D. Dissertation, University of Surrey, June 1995.


    Research Papers


    More than 100 research paper contributions in books, journals and conference proceedings. (Copies can be supplied upon request).  Publication list can be found in:




    Professor John S. Baras

    Lockheed Martin Chair in Systems Engineering

    Director, Center for Satellite & Hybrid Communication Networks

    Institute for Systems Research, A.V. Williams Building

    University of Maryland, College Park, MD 20742, USA


    Professor Anthony Ephremides

    Kim Professor in Information Technology

    Institute for Systems Research, A.V. Williams Building

    University of Maryland, College Park, MD 20742, USA


    Professor Barry G. Evans

    Pro-Vice-Chancellor Research & Enterprise,

    Ex-Director, Centre for Communication Systems Research

    School of Electronic Engineering, Information Technology and Mathematics

    University of Surrey, Guildford,

    Surrey, GU2 5XH, UK


    Mr. Mario Caron

    Research Manager, Satellite Systems

    Communications Research Centre 

    3701 Carling Avenue 
P.O. Box 11490, Stn. H 

    Ottawa, ON K2H 8S2, CANADA


    Dr. Kul Bhasin

    Manager, Space Communications

    NASA Glenn Research Center

    21000 Brookpark Road

    MS 142-1

    Cleveland, Ohio 44135, USA



    MH received the M.A. (Honours) in Electrical & Information Sciences from the University of Cambridge, U.K. in 1989, the M.S. in Electrical & Computer Engineering from the University of California, Irvine in 1992, and the Ph.D. in Engineering (specializing in satellite communications) from the Centre for Satellite Engineering Research (CSER) at the University of Surrey, U.K., in 1995.


    He worked as a Research Fellow in the Communication Systems group of CSER (1991-1995) and spent a year as a visiting fellow at the Canadian Government Communications Research Center (CRC) (1995-96). In November 1996, he joined the Center for Satellite & Hybrid Communication Networks (CSHCN) at the Institute for Systems Research, University of Maryland, College Park, where he worked as an Assistant Research Scientist and is now Adjunct Professor teaching graduate classes in telecommunications. Since 2007 he has been a Principal Communications Engineer at ITT AES leading R&D activities in the area of next generation communications for FAA, NASA and DoD programs.


    Among his awards are: a scholarship award for studies at the University of Cambridge from the Cambridge Commonwealth Trust (1984-86); a Fulbright Scholarship for post-graduate work in the United States (1989-91); a Research Fellowship from the U.K. Engineering and Physical Sciences Research Council (EPSRC) (1992), and the Canadian National Science and Engineering Research Council (NSERC) post-doctoral fellowship award (1995).


    Dr. H. is an expert on satellite, space, wireless and hybrid network optimization. He has worked for several years in networking issues for VSAT networks, developed performance evaluation methods for satellite constellations, multiple access schemes for satellite networks and designs for satellite/ATM gateways. He worked on modeling and design of satellite constellations, utilization of commercial satellites for space mission support, and extending Internet services to NASA missions. His research interests include multimedia traffic modeling, service integration for wireless and hybrid networks, end-to-end performance optimization of satellite and mobile networks, protocol support over satellite channels, design optimization of next generation broadband satellite systems and aeronautical system design and optimization. He has published more than 100 papers on these topics in a variety of journals and conference proceedings, organized and chaired conferences and served on the editorial board of technical journals.  He is active in several technical committees and involved with standardization activities in the industry.

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