Tensor CS, Inc.

Innovation in Communications


John B. Gadoury

Areas of Specialization


Modulation Techniques


  Various Hybrids

  Multi-carrier and Multi-channel Systems

Demodulation Techniques

  Optimum Signal Detection Algorithms

Communication Privacy and Security

  Digital Encryption Algorithms and Systems

  VPN Technology

Mitigation of Channel Induced Distortion

  Time, Space, Frequency and Polarization Diversity

  Adaptive Filtering

  Error correction Coding

  Propagation Path Analysis and Design

Transmitter Architecture

  Frequency Synthesis and Stability

  Linerized Amplifiers

  Antenna Design

  System Protocols

Receiver Architecture

  Low Noise AGC Amplifier

  Limiter Amplifier

  Frequency Synthesis and Stability

  Frequency Conversion

  Carrier recovery

  Timing recovery

  Analog and Digital Signal Conditioning

Signal Processing

  Analog, IF and RF Filters, SAW Filters and Correlators

  OP Amps, Instrumentation Amps, Log Amps, AD and  DA Converters, IF and RF Amplifiers

  PLL Frequency Synthisis

  Digital Filtering and Signal Processing, Multiplexer and Demultiplexer Architecture and Design

Propagation Channels

  Terrestrial and Satellite LOS (50 MHz through 120 GHz)

  Urban Propagation



  Mixed Dielectrics

Analysis tools:

  Maple Mathlab

  Agilent ADS



  Visual Basic

Design Tools

  Cadence Concept HDL




  FPGS /CPLD Design Actel, Lattice, Xilinx



Regulatory  Experience

  FCC Intentional and Non-intentional Emitter Certification

  FDA Type II Electronic Instrument Certification

  US Military Acceptance procedures

Reliability and Maintainability

  Design to Military and Bell Standards To Achieve Specific Reliability Requirements

  Redundant and Hot Swappable System Design

  BITE Design and Failure Analysis and Reporting




Consulting And Contract Engineering

  Twenty five years experience consulting in the commercial and military arenas

  Communications Systems Consultant to the Pakistani Army for their Telecommunications Infrastructure Upgrade

  LOS Path design for Egyptian Army

  UHF Satellite to Satellite Communications Link for the GPS System

  Provided guidance in the development of both LOS and Troposcatter Channel Simulators

  Provided guidance in many areas of RF and IF Communications hardware

  Developed MIB tables and algorithms for a software based network control system

  Developed the requirements and software for K-12 school Productivity software package

  HF and UHF antenna design program development concept and coding

Technical Management

  Fifteen years of lead technical experience in establishing and managing multidisciplinary design and development teams

  Recruited a team of professionals for the design to production of a wireless medical sensor

  Lead a team of engineers in the design to market of a unique RF based asset location system

  Developed a millimeter wave urban radio system to distribute varying sized groups of T! channels to remote locations from a centrally located hub.

  Lead a successful proposal team at GTE Government System and subsequently  the design team in the development of a strategic troposcatter communications system for the Berlin Boxburg corridor in Germany.

  Lead a number of R&D  teams in various aspects of military communications systems ranging from MSE command post upgrades to refurbishing submarine infrastructure

System Engineering

  Developed an idea for a wireless patient monitoring system from concept through final architecture. This project included the research of medical developments, FDA and FCC requirements, design to cost and functionality. The system will monitor a number of patients from a single wireless base station, analyze the received date, initiate appropriate warnings based on a programmable protocol, and can be monitored remotely via secure VPN over the internet.

  Developed software concept for K-12 productivity software ranging from semi automated registration of student body, attendance reporting and school nursing documentation adhering to HIPA and NH standards

  Studied various proposals and concepts for the GPS satellite system including phased arrays, required filtering and power amplifier linearization, ultimately leading to the development of a direct conversion UHF satellite to satellite receiver.

  Improved a military UHF transceiver, last ditch communications capability by 4.9 dB by appropriately redistributing filtering and high gain elements in the RF and IF path.

  Created a practical base station architecture for a wireless based asset location system. The system operating in the 2 GHz frequency space utilized a PN code and digital correlation process for determining the propagation time to and from the base station and modulated that PN code to to down load an asset information table. The design was highly constrained but a number of substantial improvements were proposed and eventually included. The system was type accepted by the FCC and placed into production.

  Reviewed a design for a millimeter wave T1/T3 urban radio system, in the process redefined the system requirements and developed a more reasonable and functional specification including system protocols and developing appropriate BITE and adhering to BELLCOR standards for reliability and interface requirements.

  Conceived the architecture, design and prototyped a radio able to transmit data at rates from 1.5 to 160 Mbps utilizing QPSK, 8PSK, 16 and 64 QAM in bandwidths equal to 2.1, 2.85, 3.8 and 5.7 bits/Hz. More than 95% of all the signal processing was implemented in FPGAs thus preserving the proprietary nature of the design.

   Lead systems engineer responsible for the design of link budgets, evaluation of interference and EMI. The system consisted of a redundant microwave backbone network and local data and telecommunications distribution network to service in excess of 2,000,000 subscribers.

  Wireless Command Post GTE internal development program, designed and developed various conceptual solutions, performed trade studied leading to a candidate architectures that provided both wireless voice and switched packet LAN service to both the MSE mobile command post and the Deep Assault command post of the future. Designed prototypes and demonstrated exceptional system performance.

  Primary responsibility to provided guidance and supervision to link engineering subcontractor for the design and EMI survey of a microwave relay system and local distribution network for the Egyptian Strategic Communications System.

  Lead a technical design team in the development of a fourth order diversity digital communications modem capable of supporting a 10 Mbit data stream through a severely distorted Tropospheric channel. The modem used adaptive filtering techniques to compensate for the channel distortion. The system was fully redundant and supported hot swapping of system modules.

Hardware Development

  Linerized UHF Power amplifier using complex signal feedback

  Designed a UHF direct conversion transceiver for the GPS radio navigation system

  Designed the architecture for a millimeter wave RF transceiver and incorporated the design into the Cyberport system

  Developed a flexible digital PSK/QAM modulator able of packing up to 160 Mbps in channels with densities of  5.7 bits/Hz

  Lead systems testing and installation teems in refurbishing and updating the strategic communications for the US Berlin Mission

  Adapted a 10 KW transmitter for use with a strategic troposcatter modem

  Developed an alternative technology to inertial TDMA carrier recovery

  Conducted propagation experiments on a high definition video link operating at millimeter wave frequencies.

  Developed a retro-directive antenna array for a covert ground to aircraft communications system

  Investigated  various diversity systems and their application to LOS and troposcatter systems

  Developed a LOS ground to aircraft channel simulator

  Developed an adaptive modem for T1 data transmission over an excess of 5km of twisted pair

  Developed a set of multi-frequency crossed dipoles and 3 dimensional loop antennas for the Apollo LSEP experimental package flown on Apollo 16

  Conducted performance studies of various hybrid FM / PSK modulation schemes

  Developed an ultrasonic channel simulator

  Incorporated a SAW delay line for carrier recovery in a  QPSK modem for a highly distorted data channel

  ECL mux/demux for 120 Mbps agregate data rate. Included 48-E1 channels, 1-20 Mbps Video channel and service channels.

  Fast Attack AGC amplifier for a TDMA modem


Employment History


Full Time Consultant - Tensor CS, Inc. (1998 - Present)

  System and Hardware Development - Tensor CS, Inc (2002 - Present)

  System and Hardware Development - ITT Government Systems Nutley NJ (2001 - 2002)

  LOS path design - Egyptian Army Communications Corps (2001)

  Consultant - BSI Concord NH (2001)

  Systems design and team leader - Pinpoint Corporation, Billerica MA  (1998 -  2001)

System Engineer Product Architect  - Windata Corp., Littleton MA (1996 - 1997) 

System and Hardware Development - Tensor CS, Inc (1994 - 1996)

Senior Member of Technical Staff - GTE Government Systems, Needham Heights, MA (1980 - 1994)

Senior Member of Technical Staff - CNR Inc., Needham, MA (1978 - 1980)

Chief Technical Staff Member - Avanti Communications, Inc Middletown, RI (1976 - 1978)

Member of Technical Staff - Raytheon Co., Various MA locations. (1968 - 1976)




Polytechnic Institute of Brooklyn - Major Physics

Mr. Gadoury has continued his education through seminars ranging from advanced design techniques, management and advanced communications and signal processing techniques including digital and Kalman filtering, multi-target multi-sensor tracking algorithms.


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