Robert Grayson Email & Phone Number

Palo Alto, California, United States

Supporting on part-time basis development of a novel GEOSat - based alternate PNT system, augmenting GPS/GNSS. Signal design, receiver algorithm development, communications performance analysis

San Mateo County, California, United States

Xona is a VC-funded startup developing the first fully commercial global navigation satellite system (PULSAR™ GNSS) via a constellation of 258 LEO satellites providing secure, always available, precise position and time. Joined shortly after company formation as principal communications engineer to lead LEO-PNT waveform development➤ Primary architect of.

Los Angeles Metropolitan Area

• Develop signal processing algorithms for a proprietary SDR platform including baseband receiver algorithms, FEC algorithms, and anti-jam signal processing algorithms
• Support RFI/RFP responses, and contribute to proposal efforts for future development programs in the areas of terrestrial and satellite systems for the DoD
• Provide technical direction and mentoring to junior and new graduate engineers working in small DSP laboratory in digital communications and signal processing

Orange County, California, United States

• Principal engineer providing signal, waveform and receiver design expertise in PNT systems for DoD applications. Responsibilities focused on 1) development of an AJ GPS Pseudolite for GPS-denied environments, and 2).
• Conducted detailed analyses and simulations and generated performance requirements to support ASIC team on theory and implementation of the modernized signals. Provided guidance to junior engineers; led weekly meetings.
• Developed extensive simulations of receiver signal processing algorithms (acquisition/tracking/decoding) of GPS L1C/L2C/L5, Galileo E1/E5, and QZSS. Devised a novel GPS L1C pilot code tracking loop with carrier/code.
• Led waveform development for U.S. Army $25M Phase I APNT TMRR study, to develop a system approach and hardware prototype for a GPS Pseudolite, a critical DOD PNT technology for GPS denied environments.
• Designed the bandwidth and power-efficient waveform enabling low-SWAP implementation on target Pseudolite platforms; performed link budget, interference, and end-to-end performance analysis; specified RF hardware.
• Collaborated with subcontractors, including RFP generation, proposal evaluation, and subcontractor selection. Supported U.S. Army oversight agencies in TIMs, Preliminary, Interim and Critical Design Reviews; authored.

California (Hybrid)

System engineering and analysis for advanced wireless and satellite communications design. Key client was Space Systems/Loral (Maxar) in Palo Alto, CA

Palo Alto, CA

• Collaborated with SSL senior management on developing protected, affordable, system and payload architectures for Protected MILSATCOM, a significant new business pursuit within SSL
• Conducted system trade studies on architectures and signal processing for protected, anti-jam MILSATCOM using high-capacity, multi-beam, commercial SATCOM, and Digital Transparent, Regenerative, or Full/Partial.
• Key contributor to proposal successfully won by SSL ($40M+ plus over 2 years, with potential for full payload development) to study architectures and demonstrate an affordable, protected MILSATCOM system and Protected.
• Performed link budget analysis and RF architecture studies, analyzed and simulated high coding gain forward error correction (FEC) schemes and hi-level modulation such as APSK and concatenated LDPC codes for protected.

San Diego, California, United States

• JTRS Radio SME and communications system engineering lead for development, integration, and test of the $600M Small Airborne Radio (JTRS-SA) embedded Software Defined Radio (SDR)
• Provided system engineering direction in technical development, integration, test, and sell-off of software defined radio including OFDM-based Wideband Networking Waveform
• Led supporting communication system technical analysis and problem solution paths through SDR integration and test at the RF, modem/DSP, and link layers
• Oversaw major subcontractors in achieving problem resolutions and maintaining technical baseline and cost; Brief high-level program management on results, risk assessment and mitigation, and alternative technical.

Greater Los Angeles Area

• Reporting to technical area director, supported internal R&D and new business pursuits, aimed at developing advanced technologies for current/future DoD networked radio and radar systems
• Evaluated various Layer 1 technologies for improving existing data link products at Raytheon including MIMO-OFDM, wavelet modulation, high data rate single-carrier modulation, SC-FDE, and advanced channel coding..
• Successfully contributed to multiple winning proposals including DARPA Mobile Ad-Hoc Interoperability Network GATEway (MAINGate) and ONR High Throughput Networking Infrastructure (HTNI) programs
• Developed several novel airborne data link designs using very low-rate channel codes coupled with large signal constellations (32/64/256 APSK) which were a key component of the winning HTNI proposal
• Supported development of hybrid communications/radar systems, including P-CDL (pulsed Common Data Link) waveform design for Raytheon MFRFS (Multi-Function RF System)
• Designed high-data rate MDPSK waveform with advanced FEC for use in high data rate MFRFS (Multi-Function RF System) Radar, and analyzed and simulated design in Matlab/C++ to verify performance

Orange County, California, United States

• Working in the advanced systems group, provided communications systems engineering, analysis, and development support to key DoD software defined radio programs including FAB-T, JTRS, and HC3
• Managed USAF systems architecture study as part of a multi-band, multiple-waveform High-Capacity Communications Capability (HC3) radio for EHF (TSAT) and Ku/Ka-Band MILSATCOM systems
• Collaborated on architecture studies of HC3 multi-band RF front end and baseband modem design to support existing new and legacy EHF MILSATCOM (LDR, MDR, XDR, TSAT), WGS, and legacy UHF satellite communications and.
• Regularly reported/presented study results to USAF customer and contractors.
• Designed and simulated parallel and serial concatenated turbo codes for block sizes up to 20K bits, to meet link margin requirements for a high data rate Ka-Band UAV SATCOM application
• Led air interface (COFDM, AJ, and LPI waveforms) performance improvement efforts for Joint Tactical Radio System (JTRS) Wideband Networking Waveform (WNW). Optimized/streamlined COFDM operational modes to reduce.

Greater Los Angeles Area

• Systems team lead for multi-national, multi-site team of communications systems engineers that developed 802.11 b/a WLAN IP, while also contributing to hands-on design of 802.11 modems
• Tracked and scheduled tasks, resolved technical issues, mentored systems engineers, coordinated PHY-layer design for 802.11b and 802.11a baseband processors
• Contributed individually and as part of team developing algorithms for packet detection, symbol, carrier, and clock synchronization, AFC, AGC, channel estimation/equalization and channel coding/decoding for both.
• Developed detailed Matlab/C++ end-to-end fixed-point simulations of 802.11b/a WLAN to verify performance and to support chipset development and verification
• Authored/managed development of 802.11 b/a baseband processor specifications. Worked with off-shore baseband and RFIC design team to develop RF ASIC design and specifications➝ 2𝘯𝘥 𝘦𝘮𝘱𝘭𝘰𝘺𝘦𝘦—𝘳𝘦𝘤𝘳𝘶𝘪𝘵𝘦𝘥 𝘣𝘺 𝘵𝘩𝘪𝘴 𝘰𝘧𝘧𝘴𝘩𝘰𝘳𝘦.

Orange County, California Area

• Independent consultant (sole-proprietorship) in communications system design for “last-mile” and home networking technologies (DSL, Powerline, UWB) and wireless systems. Key organizations supported were Lucent, Cisco.
• Contractor to L-3 (Interstate Electronics, Anaheim, CA) on algorithm development for their Melody GPS ASIC, working on tracking loop design and simulation for a combined P(Y), C/A, M-code receiver. (Anaheim, CA, 𝟐𝟎𝟎𝟕.
• For Cisco (DSL Business Unit), supported development of DSL CPE. Supported development of Very High-Speed DSL (VDSL) and ADSL-2 CPE; conducted performance tests on VDSL chipsets from competing vendors as part of.
• Working with CEO and CTO of Irvine, CA-based startup Valence Semiconductor, helped organize technology roadmap and product strategies, wrote technical requirements documents for DSL and powerline networking products..
• Developed OFDM modem architecture for home powerline networking for Valence Semi – verified theoretical performance via Matlab/C simulations over powerline channel models based on theory and measurements (Irvine, CA.
• Designed modem algorithms for a Lucent central office ADSL chipset; provided technical support to local Lucent management in business case analysis for DSL products (Huntington Beach, CA 𝟏𝟗𝟗𝟖 – 𝟗𝟗)

Tustin, CA

• 𝘕𝘰𝘵𝘦: 𝘛𝘩𝘪𝘴 𝘱𝘰𝘴𝘪𝘵𝘪𝘰𝘯 𝘸𝘢𝘴 𝘸𝘪𝘵𝘩 𝘗𝘢𝘪𝘳𝘎𝘢𝘪𝘯 𝘛𝘦𝘤𝘩𝘯𝘰𝘭𝘰𝘨𝘪𝘦𝘴 𝘸𝘩𝘪𝘤𝘩 𝘸𝘢𝘴 𝘭𝘢𝘵𝘦𝘳 𝘢𝘤𝘲𝘶𝘪𝘳𝘦𝘥 𝘣𝘺 𝘈𝘋𝘊 𝘛𝘦𝘭𝘦𝘤𝘰𝘮On direct staff to PairGain Chief Scientist/VP—supported fundamental research, technology development, and hardware design of.
• Hired by founding team shortly after PairGain IPO for development of 2nd-generation DSL technology (HDSL2 and ADSL), expanding company’s mainstay and profitable HDSL business into other commercial and consumer markets
• Performed extensive studies of advanced modulation and coding for DSL line codes, reduced complexity decoding, and advanced equalization methods to achieve improved DSL user capacity, reach, and data rates
• Developed several novel high coding-gain, but low complexity, channel coding techniques for DSL line codes, using very long constraint length PAM/QAM trellis codes and sub-optimal decoding algorithms such as sequential.
• Represented PairGain at ANSI T1E1.4 standards group during the early development of HDSL2 standard—had key role in initial technical feasibility studies which eventually led to formation of an ANSI/T1E1.4 sub-group for.
• Designed other improvements to DSL transceivers including improved timing recovery methods, and design of the 4D-TCM (Trellis Coded Modulation) FEC decoder incorporated in PairGain’s ADSL ASIC→ 𝘗𝘢𝘪𝘳𝘎𝘢𝘪𝘯 𝘛𝘦𝘤𝘩𝘯𝘰𝘭𝘰𝘨𝘪𝘦𝘴.

Greater Los Angeles Area

• Provided system engineering and communications system design, simulation, and analysis services for NASA, the DoD, and commercial satellite communications systems customers
• Specified, designed, analyzed, and simulated communications systems for NASA (JSC/GFSC) including Space Station Freedom and other NASA space communications systems
• Designed an all-digital variable-rate bandwidth-efficient modem architecture for space applications as part of internal R&D, constructed C simulation of modem and supported hardware development
• Analyzed multiple-access schemes, communications protocols, modulation and coding approaches, and carrier/symbol/code synchronization systems, for NASA near-earth space communications and telemetry and command systems
• Authored winning proposal and managed all system design, analysis, and simulation for a CDMA-based automatic vehicle location (AVL) implementation study for customer Telecom Australia; developed comprehensive.
• Supported system engineering, integration and test of MILSTAR-I satellite EHF communications payload and preliminary development of MILSTAR-II satellite system specifications► 𝘍𝘰𝘶𝘯𝘥𝘦𝘥 𝘪𝘯 1974 𝘣𝘺 𝘜𝘚𝘊 𝘗𝘳𝘰𝘧𝘦𝘴𝘴𝘰𝘳 𝘢𝘯𝘥 𝘐𝘌𝘌𝘌.

Redondo Beach, CA

• Systems Engineer in the Electronic Systems Group of TRW (now part of Northrup-Grumman) - Responsible for link budgeting, end-to-end communications performance analysis, digital satellite modem development, RF and.
• Payload system engineer for the development of complex FDM/TDM processing payload for protected EHF Satcom (MILSTAR-I payload), providing system analysis, hardware development, and test support through CDR period
• Developed extensive simulations, models, and analyses of MILSTAR communications performance in support of payload hardware development and system performance verification
• Supported test and verification of critical payload EHF demodulator/signal processor unit during post-CDR period – responsible for resolution of technical issues, directing junior systems engineers, and serving as.
• Contributed technically to several IRAD programs. Created architecture of an all-digital modem compatible with all standard military SATCOM waveforms for the DoD VHSIC program

• MTS in the Space and Communications Group, supporting development of commercial, Military, and NASA communications payloads
• Payload system engineer for Intelsat VI communications satellite, supporting integration of the communications repeater (yeah, way back then, #6, physically the size of probably 5000 cubesats)
• Analyzed end-to-end communications performance of commercial satellite links, including effects of group delay, group delay variation, ring-around leakage, AM/AM, AM/PM, IXTR, NPR, IM/PIMs and other impairments; work.
• Created simulation models and analyzed performance of bandwidth-efficient modulation systems (MSK, SQPSK, QASK, TFM, etc.) over nonlinear satellite channels as part of IRAD in support of commercial satellite.
• Designed hardware and supported development of NASA Galileo Probe Radio Receiver Hardware (RRH)

Msee, Electrical Engineering

Activities and Societies: Hughes Fellowship, IEEE Concentration in Communications Theory, Information Theory, Error Correction Codes, and.

Bsee, Electrical Engineering

Activities and Societies: Eta Kappa Nu, Tau Beta Pi