Wireless RF Systems Engineer with 20+ Years Experience
Resume:
Lamar Roundtree
Wireless Radio Communication Engineer
*****.***********@*****.***
US Maryland, US-MD, Waldorf, United States, US, 20603
SUMMARY
SUMMARY 20+ years' experience in Radio design, and electromagnetic modeling. RF systems design/analysis, direction finding system design/analysis, satellite, and wireless RF communications system design/analysis. Expertise in antenna design, satellite (space-based) communications (GPS, payloads, transceivers, antenna, earth station), and airborne/aircraft radio systems. Experienced with system architecture design, requirements analysis, and performance optimization Experienced with RF system and waveform modeling/simulation/analysis SKILLS * Proficient in C++, Java, Python, and Linux Software * Cybersecurity * Penetration testing * Infrastructure development * Wireless Engineering * Radio Frequency Engineering * OSI network layers.
* Application stacks * Windows Server * Application testing * Server/network configuration
PROFESSIONAL EXPERIENCE
Radio Systems Engineer/ Software Defined Radio Engineer
EutelSat OneWeb
May '22 – Present Arlington, VA
• Experience with Verilog for FPGA design, including implementing DSP algorithms in FPGA, and FPGA interfaces with ARM processor applications.
• Strong understanding of embedded systems, hardware design, and signal-processing concepts
• Experience with SDR platforms such as ADRV9361-Z7035 or Xilinx RFSoC
• Experience with Xilinx Zynq devices or Ultra Scale MPSoC and an understanding of the design flow and toolchain use
• Proficient with common programming languages such as MATLAB, Python, C++, and C Desired Additional Skills and Qualifications
• RTOS development for real-time operation on Cortex-A53 ARM or FreeRTOS on Cortex-R5
• Experience with wireless networking and radio communications systems
• Implementing wireless technologies on an SDR such as with the PHY, MAC, TDMA, RADAR, detection, classification, 5G, LTE, beamforming, or MIMO
RF Electrical Engineer / Technical Communications Systems Engineer
Air Span Networks
Jul '17 - May '22 Reston, VA
• Duties include the implementation of our Wireless/WiMAX/LTE Products for full interoperability either with the customers' existing network or by creating a whole new network from scratch.
• Design and develop innovative technical hardware solutions for satellite and terrestrial communications systems. The areas of interest are high- speed digital hardware design, complex FPGA development, and circuit design utilizing mixed-signal ASICs.
• Involvement and contribution to various aspects of the product life cycle including concept, analysis, development, integration, qualification, acceptance, delivery, and maintenance.
• Work effectively across multiple corporate functions including business, engineering, operations, and manufacturing.
• Involve selection and lab testing of components for product.
• Direct testing, validation, and optimization of the design using lab equipment such as high-speed oscilloscope, logic analyzer, function generator.
• Perform schematic capture, high speed signal integrity and power integrity analysis using CAD design software.
• Perform FPGA or board verification using Cadence simulation tool and FPGA vendor synthesis tools.
Satellite Systems Engineer
LinQuest Corporation
Jul '15 - Jul '17 Hanover, MD
• Provide Knowledge and development of legacy and WCDMA SATCOM system specifications based on multiple architectures and frameworks to resolve specific satellite payload control and network issues, develop models and simulations for alternate solutions.
• Review provides input to design documentation (TRDs, Specifications, interface control documents, drawings), requirements documents (ICDs, CDDs, CPDs), ECPs, PWSs.
• Organizes, analyzes, conducts, and/or monitors/oversees RF engineering activities relating to the design, development, fabrication, installation, modification, sustainment, and/or analysis of systems or systems components.
• Applies RF/systems engineering technical and technical management processes to a functional specialty in IPT environments.
Satellite Systems Engineer
LinQuest Corporation
May '15 - Jul '15 Greenbelt, MD
• Provide SATCOM Systems engineering and technical support at the Network Integration Communications Center to identify the technical approach to resolve specific Wide Band Global SATCOM (WGS) and Defense Satellite Communications Subsystem (DSCS) satellite payload control and network issues, develop models and simulations for alternate solutions.
• Perform engineering activities as they pertain to space-based equipment.
• Development of SATCOM system specifications, engineering plans and test plans; development of SATCOM based architectures and frameworks.
• Development of test plans and procedures; provide support to technology working groups and integrated product teams; develop technology development plans.
• Responsible for developing and/or implementing the new features to improve the existing programs and software.
• Profound knowledge of TDMA, CDMA and OFDMA access techniques.
• Expertise in LAB and Field testing and optimization of Communication Systems by performing prototype modeling and simulation.
• Provide support in assessment of technology maturity; develop technology transition plans.
• High performance FPGA development for a variety of applications including SIGINT, radar, satellite communications, image tracking, and precise navigation/geolocation.
• Reverse engineering of wireless communications protocols and hardware.
• Software defined radio (SDR) implementation of wireless communication protocols using GNU Radio.
• Software development for real-time embedded digital signal processing systems.
Radio Engineer / Transmission Engineer
D&S Consultants, Inc
Aug '14 - May '15 Riyadh, Kingdom of Saudi Arabia, Kingdom of Saudi Arabia
• Determine transmission solution for new BTS/Node and ensure a timely response to support the RF Coverage Planning Office and Roll out Division.
• Evaluate base receiver stations placement in the assigned area and ensure a quality transmission topology.
• Determine transmission solution for new BTS/Node and ensure a timely response to support the RF Coverage Planning Office and Roll out Division.
• Support engineering readiness reviews, pre-milestone technical reviews and requirements analysis.
• Support Management and design, integration, and implementation efforts for the Teleport Management and Control System.
• Supported four Critical Design Teleport System.
• Provide modeling for satellite communications topics such as Ka-band terminal site locations, DVB- S2/RCS modem selection, and SHF Tri-band terminal solutions.
• Support in developing program documentation including systems engineering plans, specifications, economic analysis, and life cycle cost estimates.
LTE Systems Engineer
Sprint Nextel
Feb '14 - Aug '14 Reston, VA
• 4G Development and Integration, Provide subject matter expertise and program management support to research laboratory clients.
• Provide support to a client program manager in the development of Radiofrequency (RF) wireless data network requirements and evaluation of wireless network concepts.
• Provide radio frequency (RF) and wireless transmission testing for Long Term Evolution (LTE) and related wireless networks and devices.
• Design, plan, and coordinate testing of wireless radio communication systems and devices.
• valuate and test LTE communication protocol on wireless devices based on specifications standardized by US wireless network operators and the 3GPP group (3rd Generation Partnership Project).
• Apply 3GPP specifications/standards for testing, including 36.523, 36.521, and 37.571 specifications.
• Evaluate/test using industry approved equipment and simulators.
• Effectively contribute to areas of Systems Engineering disciplines, including Research & Innovations in Spectrum Sharing Techniques, Radio Access Network (RAN) Planning and Design, Network Deployment, Optimization, Operation and Expansion of new/existing wireless networks.
• Provided Professional Engineering Services to leading equipment vendors, Government-Defense, Public Safety- Confidential, and Commercial Wireless Operators in the globe.
• Contribute to developing instrumental Strategies and Roadmaps paving the way to effectively plan, deploy, launch, and optimize.
Telecommunications RF Design Engineer III
Sprint Nextel
Jun '13 - Feb '14 Reston, VA
• 4G LTE/ Femto Cell Development and Integration, Provides radio frequency (RF) and/or wireless transmission design.
• Designs, plans, and oversees installation and maintenance of wireless radio communications systems, including radio propagation modeling and prediction, microwave path analysis, interference analysis, frequency coordination, cell site equipment layout, parameter definition, and ancillary equipment.
• Provide technical guidance for Small Cell and HetNet related technologies such as: Interference Cancellation.
• Design SON models to include Carrier Aggregation, multi-band Traffic Management, Inter-RAT Interoperability and Enhanced Mobility.
• Provide radio optimization, use of ARQ, Hybrid ARQ, PHS and ROHC amongst the techniques that can implemented.
• Profound knowledge of TDMA, CDMA and OFDMA access techniques.
• Expertise in LAB and Field testing and optimization of Communication Systems by performing prototype modeling and simulation activities in 2G (GSM, CDMA) systems as well as 3G/4G/5G technologies, including CDMA2000/EVDO, WCDMA/UMTS, Long Term Evolution (LTE), VoLTE, Small Cells, WiMAX,802.16 and Wi-Fi 802.11xx.
• Design in-building & outdoor venues deploying Metro Cells/DAS using iBwave software.
• Analyze existing indoor coverage from macro network using walk test reports from TEMS/JDSU/NEMO to identify the needed coverage & capacity enhancements.
Electronics Engineer
ManTech International
Oct '12 - May '13 KABUL, Afghanistan
• Lay out, build, test, troubleshoot, repair, and modify developmental and production electronic components, parts, equipment, and systems, such as computer equipment, missile control instrumentation, electron tubes, test equipment, and machine tool numerical controls, applying principles and theories of electronics, electrical circuitry, engineering mathematics, electronic and electrical testing, and physics.
• Read blueprints, wiring diagrams, schematic drawings, or engineering instructions for assembling electronics units, applying knowledge of electronic theory and components.
• Test electronics units, using standard test equipment, and analyze results to evaluate performance and determine need for adjustment.
• Perform preventative maintenance or calibration of equipment or systems.
• Assemble, evaluate, or maintain circuitry or electronic components, according to engineering instructions, technical manuals, or knowledge of electronics, using hand or power tools.
Radio Frequency Engineer II Sprint Nextel
Oct '10 - Oct '12
Reston, VA
• 4G Development, LTE Platform, Provide technical analysis and elevated level professional and analytical expertise to the Network Development and Engineering Organization.
• Responsibilities include evaluation of wireless transmission technologies and impacts to network design; validation and analysis of data collected from field in comparison to theoretical models.
• Design expertise in with LTE-FDD, LTE-TDD, UMTS, Small Cells, and Voice over LTE, Spectrum management, Wi-Fi, SON, smart antennas, HetNet cloud and NFV core, Apple and Android devices and applications.
• Design and analysis of wireless communications systems, Multiple-Input Multiple-Output (MIMO), Direct-Sequence Spread Spectrum (DSSS), Orthogonal Frequency-Division Multiplexing (OFDM), Modulation schemes.
• Design and use optimization software such as software Planet EV, Agilent Technologies wizard TM, Forsk, Atoll and AIRCOM International ASSETT.
• Use of IBM Rational DOORS Engineering Lifecycle that visualizes, analyzes, and organizes engineering lifecycle data and data relationships.
• Design search and query engineering data in multiple sources and locations.
• Identify operational requirements for new systems to inform selection of technological solutions.
Microwave Radio Design Engineer
ITT Corporation
Oct '09 - Oct '10 Baghdad, Iraq; Baghdad
• Design and develop RF and microwave circuits (including transmitters, receivers, and antennas) which will be used in data links.
• Interact with internal customers and suppliers to understand circuit design requirements, volume constraints and environmental specifications so that the final design is compliant with the design requirements.
• Provide daily MATLAB and Simulink analysis simulation.
• Program, trouble shoot and or perform system diagnostics on communication systems.
• Experience in the preparation of engineering specification, design, and acceptance testing documentation.
• Use of IBM Rational DOORS Engineering Lifecycle that visualizes, analyzes, and organizes engineering lifecycle data and data relationships.
• Planning, configuration, splicing and monitoring the Optical Fiber Networks.
• Design microwave IC's and integrate mixers.
• Solid background in Microwave and RF design principles with experience at 8-80 GHz.
• Demonstrated ability to integrate RF subsystems with analog, digital, and mechanical designs.
• Experience with high-frequency circuit design and design tools (AGILANT ADS OR HFSS).
Radio Transmissions System/ Satellite Transmissions System Operator/ Radio Transmission Chief
United States Marine Corps
Jul '96 – Jul’09 Camp Lejeune, NC
• Research, design, develop, or evaluate electronic components and systems for commercial, industrial, military, or scientific use employing knowledge of electronic theory and materials properties.
• Design electronic circuits and components for use in fields such as telecommunications, aerospace guidance and propulsion control, acoustics, or instruments and controls.
• Performed scheduled preventive maintenance tasks, such as checking, cleaning, and repairing equipment, to detect and prevent problems.
• Making changes to frequencies or cryptographic codes; and maintaining equipment at the first echelon.
• Inspected components of Classified and Unclassified equipment for accurate assembly and installation and for defects such as loose connections and frayed wires.
• Knowledge of VHF/HF/UHF and microwave radio access design.
• Conduct on-site and remote troubleshooting and maintenance assistance for problems that cross multiple systems.
• Perform conceptual systems design, link analysis, hardware trade studies, technical tradeoffs, and costing for military and civilian satellite communications system design concepts.
EDUCATION
Master of Science: Network and Communication Systems - in Progress
Keller Graduate School of Management Arlington, VA
Bachelor of Science: Network and Communication Systems -Feb 2011
DeVry University Arlington, VA
Associate of Science: Computer Science
Cecil College Maryland - May 2024
Associate of Arts: General
University of Phoenix - January 2006
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