Dr. Roshdy H.M. Hafez: Curriculum Vitae

Current Employment:     Professor,

                                          Department of Systems and Computer Engineering,

                                          Carleton University,

                                          1125 Colonel By Dr., Ottawa, Ontario, Canada K1S 5B6

                                          Bus. Tel. (613) 788-5731       Bus, Fax (613) 788-5727

                                          Res. Tel. (613) 727-1783       Res. Fax (613) 228-8585

                                          email: hafez@sce.carleton.ca

 

Education:                        Ph.D. (1979), Carleton University, M.Sc. (1974), University of Alexandria, B.Sc. (1971), University of Alexandria, Egypt, all in electrical engineering.

 

Employment:

 

•      1994 - present      Professor (Carleton University)

•      1986 - 1994         Associate Professor (Carleton University)

•      1980 - 1986         Assistant professor (Carleton University)

•      1978 - 1980         Radio Spectrum Engineer (Department of Communications, Ottawa)

 

Career Highlights:

 

•      1990 - present      Member of the Canadian committee of CCIR/ study group 8 which studies the international regulations and standards of future personal wireless communications.

•      1989 - present      Project leader in the  Telecommunications Research Institute of Ontario (TRIO).  Lead several projects on adaptive interference reduction, and CDMA wireless networks.

•      1989 - present      Project leader in the  Telecommunications Research Institute of Ontario (TRIO).  Lead several projects on adaptive interference reduction, and CDMA wireless networks.

•      1989 - 1996         Project Leader of a research contract with Nortel to model transcoding and content filtering for internet wireless browsing through proxy servers.

•      1980 - 1999         Had 25 consulting contracts with the DOC (now Industry Canada) to conduct studies on the following issues: 3G spectral compatibility issues.  Broadband CDMA systems.  Broadband wireless systems (LMCS). Inter-service-interference of radio systems. Interference reduction techniques,  Modelling of the radio spectrum resources.  Spectrum management models.  Radio specification standards for analog and digital systems.  Data transmission over existing cellular radio systems.  VHF/UHF radio systems.  Voive/Data Integration over PSTN/Mobile radio systems.  Field measurements of radio propagations in urban areas.

•      1980 - 1999         Had many consulting projects with various telecommunications industrial organizations, including: Harris Communications, Ericsson, Nortel, VISTAR, Bell Canada, Bell Mobility Cellular, INTELSAT, NYNEX, Canadian General Electric, DataRadio, NovaTel, MNET, ElectroCom Automation,Tx., KVA Electronics, Intellitech of Canada Ltd., RAM,NJ.  The consulting work focuses on analysis, design and implementation of analog and digital radio sub-systems, such as: modems, adaptive interference cancellers, modelling of radio channels and mobile channel simulators.

 

•      Total research funds is about $900,000 as principal investigator and $2,750,000 more as participant in major research projects.  All his research is centered around wireless communications.

 

•      Supervised more than 40 Master and Ph.D students in the area of wireless communications.  The majority of his ex-students are now employed by leading companies in the telecomm field, such as Nortel, Bell Canada and Newbridge.

 

•      Published more than 80 papers in international technical journals, magazine and conference proceedings, and acted as an external reviewer of many international publications, and theses examination boards.

 

•      Spent his last sabbatical (1995-96) with VISTAR and Industry Canada and spent his previous sabbatical leave (1987-88) with Bell Northern Research (Nornel) and the Department of communications.

 

•      Fifteen years of active participation in major international conferences on wireless.  His work is known worldwide. 

 

•      Designed and participated in the development of advanced modems suitable for communications over multipath radio propagation and interference conditions.  The modems are now being used DataRadio and Canadian General Electric.  He also designed and developed a mobile radio channel simulator that sold to Motorola, BNR, Nynex, NovaTel, RAM, General Electric and Bell Labs AT&T.

 

TEACHING

 

Undergraduate:            - Signals and Systems

                                    - Communication Theory

                                    - Systems and Simulation

                                    - Numerical Methods

 

Graduate:                    - Network Access Technologies

                                    - Wireless Communications Systems

                                    - Introduction to Mobile Communications

                                    - Principles of Digital Communications

                                    - Advanced Digital Communications

                                    - Stochastic Processes

                                    - Neural Networks

 

Short Courses:             - TCP/IP and Mobile IP (2-day) (1999)

                                    - Broadband CDMA Systems (3-day) (1999)

                                    - CDMA2000 Detailed Physical Layer (1999)

                                    - Broadband CDMA (4-days) (1998-99)

                                    - DSP Applications in Wireless (5 days) (1996-98)

                                    - Wireless Communications (5 days) (1996-98)

                                    - High Speed Modems for Fixed Wireless (1 days) (1997-98)

 

Tutorials:                    - International Communication Conference (ICC)' 99 Vancouver

                                                Full day tutorial on "Broadband CDMA"

                                    - Vehicular Technology Conference (VTC)'98 Ottawa

                                                Full Day Tutorial on "CDMA and IS-95"

                                    - ICC'98 Atlanta Georgia

                                                Half day tutorial on "CDMA and IS-95"

                                    - NOMS'98  New Orleans

                                                Half day tutorial on "Overview of Wireless Technologies"

                                    - ICC'96 Dallas

                                                Full day tutorial on "Commercial DS-CDMA" 

 

·       Scheduled to give 1/2 day tutorial on "3G Wireless Access" at NOM'2000 in Hawaii, April 2000.


 

List of Consulting Appointments

1999                Nortel, Ottawa   Wireless Internet Browsing through Proxy Servers.  Information transcoding and bandwidth adaptation.

1999                Industry Canada, Ottawa     Deployment scenario for 3G systems and analysis of co-existence and band sharing.

1998                Nortel, Ottawa   Simulation and analysis of IS-95-B.  Radio resource management and estimation of the channel soft capacity.

1997                VISTAR, Ottawa         Consulting work on multimedia CDMA access to ka-band and ku-band satellites.

                        Industry Canada, Ottawa  Consulting work on broadband wireless access and issues related to telecommunications convergence.

1996                Industry Canada, Ottawa  Consulting work on: (1) Local Multipoint Communication Systems (LMCS) and (2) Evaluation of the Geotek system. 

1995                VISTAR, Ottawa         Consulting work on two projects:  (1) Multiple Access Techniques for Multimedia Satellite Communications and (2) Direct to Home (DTH) video-on-demand by satellite.

                        Industry Canada, Ottawa  Radio Interference Analysis and modelling.

                        Communications Research Center, Ottawa   Joint Project for developing software for rapid deployment of PCS systems in the 2 GHz band.

                        DREO, Ottawa    Multi-radar Target tracking.

1994                Industry Canada , Ottawa   Spectrum sharing of PCS systems and fixed microwave ralays.

                        Bell Northern Research, Ottawa     Radio range prediction for deployment of indoor wireless systems.

                        Revenue Canada, Ottawa  Decomposition of IMS Signals Using Neural Signal Processing Techniques

1993                Dept. of Industry and Science, Ottawa   Inter-service Interference techniques

1992                Communications Canada, Ottawa   Modelling of Inter-service interference

1991                Communications Canada, Ottawa   Modelling of Inter-service Interference.

Bell Cellular, Toronto    Field measurements (at five cell sites in Ottawa) to compare vertical and horizontal antenna space diversity.

                        OSCAN Electro-Optic Inc., Ottawa   Development of a fingerprint identification system using neural networks.

1990                Communications Canada, Ottawa   Neural networks interference reduction system and evaluation of inter-service interference.

MATCOM Mobile International, Ottawa   Participated in the design and development of a mobile channel simulator (RF, baseband processing, user and computer interface).  The instrument is nowbeing used by organizations with major R&D departments including: BNR, MOTOR­OLA, NYNEX and NOVATEL.

1989                ElectroCom Automation Inc., Arlington, Tx.   Short course and consulting work on channel coding techniques for mobile packet radio systems

                        Communications Canada, Ottawa  A study of the effect of users geographical distribution on the utilization of the radio spectrum.

1988                General Electric (Canada), Toronto Design of a 9600 bps mobile radio modem with fast bit timing synchronization.  The modem is currently in production and is an integral part of a GE mobile radio system.

                        Bell Northern research, Ottawa   A feasibility study of viable in-door personal wireless communication systems.

                        Communications Canada   A comprehensive study to model the radio spectrum from the spectrum manage­ment point of view.  The study considers the three dimensional nature of the spec­trum and takes into account the user's geographical distribution.

1987                KVA Electronics Inc., Toronto   Design and development of TMS320-based telephone modem.

                        Communications Canada, Ottawa  Analytical and simulation study of the effect of integrating radio services on the spectrum utilization efficiency.

1986                MNET Inc., Ottawa  Design and evaluation of novel modulation/coding system to be used over conven­tional FM radio in the context of thin route mobile data.

                        Dept. of Communications, Ottawa Data transmission over existing (AMPS) cellular radio systems.

1985                Intelsat, Washington D.C.  Acted as an advisor on the performance of constant envelop modulation methods for satellite services, and the merits of combining coding and modulation for nar­row band single channel per carrier systems.

                        Dept. of Communications, Ottawa  Proposal and study of a novel simulcast data transmission system to be overlaid on existing AMPS cellular systems with minor modifications to the current protocol.

                        Bell Canada, Ottawa   Study of control and management of error performance on digital data transmis­sion facilities.

                        Intellitech of Canada Ltd., Ottawa  A study on behalf of AES to evaluate a proposed scheme for interfacing SPAR's satellite earth station to tandom computers.

                        DataRadio, Montreal  Modem design for fading mobile channels and line-of-sight packet radio systems.

1984                Novatel, Calgary  System concepts and design aspects of portable radio networks.  Conceptual design aspects of hand-held radios, efficient modulation methods and propagation models.

                        Dept. of Communications, Ottawa  A feasibility study of the adaptation of SYNCOMPEX systems to VHF/UHF   mobile channels.

                        Bell Northern Research, Ottawa

A simulation feasibility study for a passing token fibre optics local area networks.

1983                Glenayre Electronics Ltd., Vancouver

Consulting work within the MSAT UHF ground WOR study.

Intellitech of Canada Ltd., Ottawa  Consulting work on the SARSAT project.

Communication Research Centre, Ottawa Adaptive equalization techniques for digital HF channels.

Dept. of Communications, Ottawa   Field measurements on digital mobile radio channels in the national capital region.

1982                Dept. of Communications, Ottawa   Analysis and design of fixed/mobile radio terminals for transmission of integrated voice and data signals.

Graduate Students in the past 6 years

Ph.D.

Current Job

J. Guo

In-prog.

Transcoding for IP wireless access

 

Y. Nafei

In-prog.

IP-Based Broadband CDMA Access

Nortel

P. Larijani

1994-99

QoS for Multimedia CDMA

Nortel

G. Rajugopal

1994-97

Robust Video Transmission over Wireless Ch.

ShareWave Inc. USA

N. Movahhidinia

1993-96

Adaptive polling for ATM wireless networks

Prof. (Iran)

F. Hendessi

1992-95

Frequency Shift Coding for High Tolerance to Near Co-ch. Interference

Professor (Iran)

Master of Engineering (M.Eng.)

Current Job

C. Saw

In-prog.

Simulation of 3G CDMA systems

 

O. Khan

In-prog.

Wireless web browsing

 

A. Saghir

In-prog.

Web Access within W-CDMA standard

 

Wei Wang

In-prog.

Antenna arrays for WCDMA

 

Bin Lu

In-prog.

Protocol for data transmission on CDMA channels

 

Selena Che

In-prog.

Simulation of LMCS Access Protocol

 

S. Vrzic

In-prog.

Teletraffic simulation of mixed voice/data CDMA cellular system

 

C. Cai

1998

Power control of Multimedia CDMA

Nortel

M. Salamania

1998

Experimental Study of Multi-tone Modulations in Multipath Channels

Nortel

M. Gertsman

1997

Symbol-by-symbol Demodulation of CPM Signals Transmitted over Rayleigh Fading Channels

CRC

X. Wu

1997

Video transmission over CDMA channels

?

P. Wang

1995

Simulation of Signal reception in millimeter wave channels

Nortel

S. Arcand

1995

Satellite/Cellular Integration and Shared Resources

DND

P. Larijani

1995

Reduction of ACI using DFE in Multipath Channels

Nortel

C. Zhang

1995

Traffic Characteristics of Indoor Wireless Broadband Networks Using CDMA Multiple Access

Nortel

J.P.Decryunaere

1994

Invariant Transforms Using Neural Networks

Ph.D.

A. Darrat

1994

Bit Timing Synchronizers for Code Division Multiple Access Schemes using Neural networks

Nortel

M. Thyagarajan

1993

Multi-Access Schemes for In-door Wireless Personal Communications in the 20-60 GHz Band

Nortel

X. Yao

1993

Non-linear Channel Equalization using neural nets

?

D. Yu

1993

Simulation Study of Co-channel and Adjacent Channel Interferences in In-door Wireless Personal Communication

Nortel

S. Golestaneh

1993

Adjacent Channel Interference Reduction using Decision Feedback Equalizers

Bell Canada

Recent Undergraduate Students (4th year projects)

Current Job

M. McEvoy

In-prog.

Deployment software for CDMA cells

N/A

D. Barakat

In-prog.

Simulation of Internet wireless traffic

N/A

M. Elmi

In-prog.

Wireless Internet Browsing

N/A

J. Mulahusic

In-prog.

Step-Down interface board

N/A

D. Peluso

1999

Cell site planning tools

Nortel

P. Thiyagarajah

1999

Base station Teletraffic analysis

Nortel

 

 

RESEARCH GRANTS, RESEARCH CONTRACTS

 

As Principal Investigator

 

1999-2000 Nortel Grant                      Wireless Internet Transcoding            $38,300

                  NSERC Operating Grant   Wireless Networks                                         $26,500

                  CITO Contract                   CDMA Multimedia                                         $78,000

1998-1999 Nortel Grant                      IS-95-B RRM                                                  $35,000

                  NSERC Operating Grant   Wireless Networks                                         $26,500

                  CITO/TRIO Contract           CDMA Multimedia                                      $45,000

1996-97     NSERC Operating Grant   Wireless Networks                                         $20,500

                  TRIO Project                     CDMA Deployment                                        $74,000

                  DREO Contract                 Fractal signal processing                                $19,000

1995-96     NSERC Operating Grant   Wireless Networks                                         $20,500

                  TRIO Project                     PCS Deployment Techniques                          $95,000

1994-95     NSERC Operating Grant   Signal Processing for Wireless                       $12,610

                  TRIO Project                     PCS Deployment Techniques                          $78,000

                  CITR Project                     Broadband Wireless Systems                          $24,000

                  DREO Contract                 Multi-radar target tracking                              $34,000

1993-94     NSERC Operating Grant   Signal Processing for Wireless                       $12,610

                  TRIO Project                        Neural Signal Processing                             $89,000

                  CITR Project                        Broadband Wireless Systems                       $24,000

1992-93     NSERC Operating Grant   Signal Processing for Wireless                       $12,610

1991-92     NSERC Operating Grant      Signal Processing for Wireless                    $12,000

                  TRIO Project                        Neural Networks                                          $10,000

                  Communications Canada      Inter-service interference                             $28,000

1990-91     NSERC Operating Grant      Signal processing for Wireless                    $12,000

                  TRIO Project                        Neural Networks                                          $06,500

                  Communications Canada      Interference reduction using neural nets.      $25,000

                  OSCAN Electro Optics Inc.      Fingerprint neural classifiers.                 $14,025

1989-90     NSERC Operating Grant      Signal processing for mobile comm.            $12,000

                  Communications Canada      Spectrum quality indicators                          $23,000

1988-89     NSERC Operating Grant      Signal processing for mobile comm.            $14,000

1987-88     NSERC Operating Grant      Signal processing for mobile comm $14,000

1986-87     NSERC Operating Grant      Signal processing for mobile comm $14,000

                  Dept. of Communications     Cellular Data transmission (phase II)           $15,000

1985-86     NSERC Operating Grant      Signal processing for mobile comm.            $12,500

                  Dept. of Communications     Integrated radio services                              $27,000

                  Dept. of Communications     Cellular Data transmission (phase I).           $12,000

1984-85     NSERC Operating Grant      Signal processing for mobile comm.            $12,500

                  Dept. of Communications    SYNCOMPEX stems (phase II)                    $16,626

 1983-84    NSERC Operating Grant      Signal processing for mobile comm $12,500

                  Dept. of Communications     SYNCOMPEX systems (phase I)                 $33,880

1982-82     Dept. of Communications     Field measurements for data at 800 MHz     $99,462

                  Dept. of Communications     Integrated Fixed/Mobile Systems                 $39,540

                  NSERC GR-5                       Raised cosine pulse under fading                 $01,500

 

                                                                                                           

As Participant

 

1991-94     NSERC Strategic Grant (A.U.H.Sheikh)                                                   $300,000

                  CITR(D.D.Falconer)                                                                                 $89,000

1991-92     Bell Cellular (M.El-Tanany)                                                                     $28,000

                  CITR (D.D.Falconer)                                                                                $32,000

                  TRIO (S.Haykin)                                                                                       $60,000

                  TRIO (S.Mahmoud)                                                                                  $150,000

1990-91     TRIO (S.A.Mahmoud)                                                                               $274,000

                  CITR (D.D.Falconer)                                                                                $32,000

                  TRIO (S.Haykin, McMaster U.)                                                                $150,000

1989-90     TRIO (S.A.Mahmoud)                                                                               $320,000

                  TRIO (S.Haykin, McMaster U.)                                                                $120,000

                  NSERC Equpment Grant (D.D.Falconer)                                                 $142,854

1988-89     TRIO (S.A.Mahmoud)                                                                               $320,000

1987-88     TRIO (S.A.Mahmoud)                                                                               $320,000

1987-89     NSERC Strategic Grant (S.A.Mahmoud)                                                  $300,000

                  NSERC Equipment Grant (A.U.H.Sheikh)                                                $43,468

                  Bell Canada (D.D.Falconer)                                                                     $35,000

                  Bell Canada (D.D.Falconer)                                                                     $35,000

RESEARCH CONTRIBUTIONS

 

1. Most Significant Contributions to Research and/or Practical Applications

1. Admission control in Multimedia CDMA [2,4,8,9]: analysis of the problem of by mapping the required QoS onto an array of Eb/No (average, minimum and outage) and finding feasible solution to the resulting non-linear power assignment problem.  The solution is novel and elegant and is now being adopted by research groups within Nortel.

2. Robust video transmission over noisy wireless channels [3,10,15,16]: This is a very novel approach to jointly optimize image coding and channel coding in time-varying channels.  The video coding is based on wavelet, which is excellent but non-standard.  The approached inspired several other techniques that are now being exploited by Dr. Rajogopal.

3. TDM-Polling access for high speed fixed wireless links [5,17,18]: Novel polling/TDD scheme for adaptive time slot allocations suitable for 40 Mbps fixed wireless systems.  We obtained simple formulas at near-saturation condition.  The scheme is effective and simple. 

4. Automatic deployment of CDMA base stations: very innovative method for matching the base station locations to the demographic distribution of users.  The scheme is based on the neural network concept of self-organized maps.  TRIO funded this work and I made several presentations to industry members on the concept. 

5. Significant contribution to CDMA educating: Presented highly evaluated and appreciated CDMA tutorials in major conferences (ICC'99, VTC'98, ICC'98, NOAM'98 and ICC'96).  Got invited to teach CDMA courses to:  Ericsson, Bell Mobility, Nortel (22 times), Harris Communications and Texas Instruments.  Got invited to give IEEE professional seminars.  I got several request to reprint my notes, which are now widely circulated.

 

2. Other Research Contributions

·       Articles in refereed publications

     Published or accepted

·       F. Hendessi, A.U.H.Sheikh and R.H.M. Hafez, "Co-Channel and Adjacent Channel Interference in Wireless Cellular Communications", Wireless Personal Communications, Volume 12, Issue 3, March 2000

·       P.R. Larijani and R.H.M. Hafez: "Framework for Distributed Control of Multimedia Wireless CDMA Networks", accepted for publication in AJSE.  Special issue on "wireless".  We were invited to contribute to this issue.  1999.

·       G.R. Rajugopal and R.H.M. Hafez, "Adaptive rate controlled robust video communication over packet wireless networks", ACM, Mobile Networks and Applications 3, pp 33-47, 1998

·       P.R.Larijani, J.W.Chinneck, R. H.Hafez, ÒNon-linear power control in multimedia CDMA wireless networks", IEEE Communication Letters, Sept. 1998

·       N. Movahhedinia, G. Stamatelos and R.H.M. Hafez, "A Time-slot assignment strategy for ATM broadband indoor wireless networks", Wireless Personal Comm. 5, pp 89-111, 1997

·        C.G. Zhang, R.H.M. Hafez and D.D. Falconer, "A Broadband Indoor Wireless Network Using CDMA Multiple Access", IEEE Journal on Selected Areas in Communications, Special Issue on CDMA Networks , pp. 645-653. May, 1994.

·       S. Golestaneh, R.H.M. Hafez and S.A. Mahmoud, "The Effect of Adjacent Channel     Interference on the Capacity of FDMA Cellular Systems", IEEE Transactions on     Vehicular Technology, Vol. 43, No. 4,  pp. 946-954November, 1994.

     Submitted

·       P. Larijani and R.H.M. Hafez, "Power assignment and access control for multimedia CDMA wireless networks" submitted for publication in IEEE transactions on Veh. technology, 1999

 

·       Other refereed publications

·       P.R.Larijani, R.H.Hafez and I.Lambadaris, ÒTwo level access control strategy for multimedia CDMA network " ICC98, Altlanta, Georgia , June 1998

·       G.R. Rajugopal and R.H.M. Hafez, "Robust video communications over wireless packet network", IEEE-ICIP' 97, Santa Barbra, USA, October 1997

·       R.H.M. Hafez and G. Chan, "Measures of Spectrum Utilization", Special session on    spectrum management issues. 1997 IEEE AP-S International Symposium and URSI North    American Radio Science Meeting. July 1997. Montreal. Canada.

·       P.R. Larijani, R.H.M.Hafez and I. Lambadaris, "Adaptive Access Control for Multimedia    Traffic in CDMA Cell with Imperfect Power Control". 8th IEEE International Symposium on Personal, Indoor and Mobile Communications, PIMRC'97 ".Sept.1997,Helsinky.Finland.

·       P.R. Larijani, R.H.M. Hafez and I. Lambadaris, "Joint Access Control and User Removal    in Multimedia CDMA Cell", Globecom 1997, Phoenix AZ.

·       P.R. Larijani, R.H.M.Hafez and N. Movahedinia, "Admission control for multimedia    CDMA". Wireless'96.  July 1996. Calgary. Canada.

·       G.R. Rajugopal, R.H.M. Hafez and S.A. Mahmoud, "Robust zerotree coding for video communications over mobile networks", IEE-ICPMSC' 96, Hong Kong, December 1996

·       G.R. Rajugopal, S.A. Mahmoud and R.H.M. Hafez, "Multi-resolution motion estimation at low bit rates", IEEE-TENCON' 96, Perth, Australia, November 1996

·       N. Movahhedinia, G. Stamatelos and R.H.M. Hafez, "Non-Uniform Polling and    Reservation Alternatives for Bandwidth Management in Broadband Wireless    Networks", IEEE GLOBECOM'96, London, England, Nov. 1996.

·       N. Movahhedinia, G. Stamatelos and R.H.M. Hafez, "A Time-slot assignment protocol for indoor wireless ATM networks using the channel characteristics and the traffic parameters", GLOBECOM '95, pp 327-331, 1995

·       F. Hendessi, A.U.H. Sheikh and R.H.M. Hafez, "Capacity Improvement of Microcellular     Systems Using Signal Cyclic Spectral Properties", The sixth International Conf. on   Personal, Indoor and Mobile Radio Communications (PIMRC'95), Sep. 1995

·       S. Arcand, K.M.S. Murthy and R.H.M. Hafez, "Load Sharing Algorithms for Hybrid Mobile Networks", International Mobile Satellite Conference (IMS'95). June 1995.

·       M.S. El-Tanany, R.H.M. Hafez and G. Chan, "Inter-system Interference Modeling for Land Mobile Systems", Canadian Conf. on Elec. and Computer Eng. Sep. 1995

·       D.Yu, D.D. Falconer and R.H.M. Hafez, "Interference Characteristics of TDMA In-building Wireless Systems", ICUPC'94, San Diego. USA, Sept. 1994.

·       G. Boudreaux and R.H.M. Hafez, "Range Prediction for Indoor Wireless Systems",     Wireless '94 , Calgary, AB, Canada, July, 1994.

·       D. Yu, D.D. Falconer and R.H.M. Hafez, "Traffic Capacity Studies of TDMA In-building Wireless Systems", ICUPC'93 , page 696, Ottawa, Canada, October, 1993.

·       F. Hendessi, R.H.M. Hafez and A.U.H. Sheikh, "The Structure and Performance of FRESH-Decision Feedback Equalizers in the Presence of Adjacent Channel Interference", Proceedings of the 1993 Vehicular Technology Conference , May, 1993.

·       V.R.M. Thyagarajan, R.H.M. Hafez and D.D. Falconer, "Broadband Indoor Wireless    Communications in the (20-60) Ghz Band: Signal Strength Considerations", ICUPC'93, Ottawa, ON, Canada, October, 1993, pp. 894-899.

·       R.H.M. Hafez, D.D. Falconer, G Stamatelos and S.A. Mahmoud, "Fundamental Issues in Indoor Millimeter Wave Systems", Wireless '93 , Calgary, AB, Canada, July, 1993.

·       K. Islam, R.H.M. Hafez and D.C. Coll, "Cyclic Spectral Analysis of Direct Sequence Spread Spectrum Signals", Proceedings of the 1993 Vehicular Technology Conference, May, 1993.

·       R.A. Goubran, R.H.M. Hafez and A.W. Lawrence, "Digital Signal Processing Applications in IMS", Int. Symp. on Ion Mobility Spectrometry , Quebec City, QC Canada, August, 1993.

 

·       Non-refereed publications

·       R.H.M. Hafez: "Broadband CDMA systems", tutorial report on recent advances in broadband research and standardization.  Presented to Nortel, Texas Instruments and Harris, 1999

·       R.H.M. Hafez , "Compatibility of second and third generation wireless systems",  report prepared for Industry Canada, 1999.

·       R.H.M. Hafez: "CDMA & IS-95", tutorial notes written and distributed to engineers in Nortel, Ericsson and Harris Communications, 1998

·       R.H.M. Hafez: "Signal Improvement Techniques for Personal Wireless Systems", presented to Nortel, 1997

 

·       Contributions to industrially relevant research and development

-   In-Progress: Research project with Nortel on "IP wireless access through proxy server".  It addresses the problem of adapting webpage contents to the bandwidth limited wireless environment.  3 graduate students are being co-supervised by the applicant and Dr. T. Kunz from Carleton as well as Dr. C. Cao from Nortel

-   In-Progress: Research project with Nortel on "Simulation and analysis of multimedia 3G CDMA systems".  A graduate student is working closely with Nortel and is being supervised by the applicant.  The results of this work are contributing to Nortel's development in 3G wireless systems.  Nortel and CITO fund the research.

-   Completed 1999:  A short engagement with Harris Communications to evaluate and provide expert advice on "Synchronous CDMA Deployment in LMDS Channels". The project involved a comparative study of the capacity of TDMA-based vs. S-CDMA-based LMDS return channels for Internet browsing.

-   Completed 1999:  A study funded by and performed on behalf of Industry Canada.  The title of the study is: "Compatibility and co-existence of second and third generation wireless systems".  The study provided an objective evaluation of inter-system interference of exiting PCS systems and the one proposed for the 3G deployments.

-   Completed, 1998: A research project funded by TRIO and Nortel entitled: "Development and Evaluation of Power Control methods for mixed voice/data CDMA systems".  A graduate student supervised by the candidate participated in the development of power control algorithms suitable for an evolved version of IS-95 CDMA system"

-   1994 - 1998: The applicant was an active member of TRIO (Telecommunications Research Institute of Ontario).  During that time, he led several research projects in close cooperation with many industrial TRIO members.  The main thrust of his work was "Intelligent Deployment Methods for CDMA systems".  The work involved many aspects of the PCS deployment process, including: automatic selection of the optimum base station locations, matching the base station grid to the user's population density, optimizing the antenna sectors to match the user density and traffic patterns and similar issues.

-   1993 - 1999: The applicant has several consulting appointments with industrial and governmental organizations.  All of these appointments involved research element in the field of mobile and wireless system design.  The applicant provided consulting to:  Bell Mobility, Harris Communications, Nortel, Industry Canada, Semiconductor Insights and Vistar Communications.