SUMMARY:

• Well suited for opportunities in communication system design, DSP/machine learning algorithm development, and big data processing:
• Proficient in digital communications theory and statistical signal processing
• Proficient in machine learning and artificial neural network algorithm development
• Extensive experience in modem physical layer architecture, design and simulation
• Proficient in MATLAB/Simulink, Mathimatica, Octave, C/C++ and R programming
• Extensive experience in developing analytical models for characterizing digital communication system over fading channels

PROFESSIONAL EXPERIENCE:

Principal Engineer

Confidential, Herndon, VA

Responsibilities:

• Perform extensive research on the capability of corporate intellectual property (IP) and compared to traditional schemes in terms of spectral efficiency, bandwidth requirement, bit error rate and implementation complexity
• Investigate several tradeoff scenarios to demonstrate the strengths and weaknesses of the technology
• Enhance system performance by incorporating very efficient machine learning algorithm into the IP
• Generate IP for efficient and low power consumption machine learning algorithm for digital communication system demodulation and equalization
• Report in a timely manner the development progress status and resolution plans on open design issues directly to the Chief Technology Officer
• Designed - in the IP into WiFi ecosystem and simulated end-to-end system performance with comparison to existing WiFi technologies
• Integrated IP with wireless transmitter and receiver performing several communication DSP including forward error correction, AGC, clock, carrier frequency, carrier phase, symbol timing, and frame synchronization
• Using adaptive filter and statistical signal techniques, proposed, designed and simulated efficient LMS and RLS equalizers that meets desired specification
• Designed and simulated variable rate (1/2 - 5/6) LDPC encoder/decoder using Min-Sum message passing algorithm
• Came up with algorithm to calculate the log-likelihood ratio of the IP’s constellation
• Using advance DSP techniques, designed, verified and optimized different FIR and IIR filters
• Use MATLAB HDL coder and advisor to convert MATLAB codes to VHDL to fast track prototype development
• Coordinate with embedded system, FPGA and analog front-end personnel to deliver a demonstrable prototype
• Developed requirement document and provide project management assistance for prototype development
• Architect the IP for microwave backhaul solution including system simulation and hardware selection
• Designed a propriety low latency TDMA link layer protocol for guaranteeing high throughput with four 9s availability
• Estimated the range extension capability of the technology compared to the competitions by using common link budget parameters and accurate RF propagation modelsCharacterized DSL line for accurate system design and to obtain reliable simulation performance data
• Designed and optimized the impedance matching network for DSL line across 30MHz bandwidth (IP)
• Designed and verified a hybrid/echo canceller design that guarantees up to 60dB of Tx-Rx isolation on DSL line (IP)
• Designed and simulated an MMSE equalizer for DSL line
• Designed and optimized the frequency band plan to maximize achievable throughput
• Designed and simulated a fixed rate LDPC encoder/decoder using Min-Sum message passing algorithm
• Verified that the analog front-end meets the digital system requirement and characterized the receiver sensitivity of the prototype hardware
• Recommended different techniques to reduce noise and improve the receiver sensitivity of the prototype board

RF Product Development Engineer

Confidential, Orlando, FL

Responsibilities:

• Defined and managed a portion of RF passives portfolio including 7 world class RF products and two technology development programs (later became corporate IP) with estimated revenue of more than $120M over 3 year product life span and GM of 50% (minimum)
• Owned all the datasheet related to developed products and provided system level application support to customers
• Using big data techniques and sales analytics, provided product pricing support and demand/supply forecast
• Led the investigation of acoustic filter for software defined radio capability and carried out feasibility study for narrowband zero TFC SAW filter technology
• Assisted in developing sales collateral such as product documentation, spec sheets and brochures, product presentations, special promotions, new product announcements and literature
• Attended sales and strategy events; visited customer sites to answer technical questions on new products being introduced into the market
• Interfaced with OEMs such as Qualcomm, Mediatek, Intel to argue product competitiveness and ensured products are included on their designs
• Developed the receiver sensitivity comparison tool that’s used across sales team for competitive comparison in customer presentation
• Provided application support to customer during new product lunch including impedance matching and harmonic generation reduction recommendations
• Used Microwave office to optimize component values for impedance matching
• Acquired good knowledge of 3GPP and FCC specifications for LTE bands’ RF emission and radiation limits

Graduate Research Assistant

Confidential, Prairie View, TX

Responsibilities:

• Employing convex optimization technique, developed throughput optimization algorithm for APP/NET/MAC/PHY cross-layer design of cooperative communication system. Readily applicable to coordinated multipoint processing (CoMP), higher order single user MIMO, and multi-user MIMO interference analysis and management
• Using scaled conjugate gradient algorithm, came up with invertible exponential approximation for conditional symbol error probabilities of different digital modulation schemes. This facilitated the development of analytical models to compute the average BER of adaptive modulation schemes over a myriad of fading channels
• Applied Levenberg-Marquardt optimization algorithm to find the optimum voting criteria for leader election in ad hoc cognitive radio network. Hence was able to come up with a novel leader election algorithm for cognitive radio system
• Expressing the Marcum and Nuttall Q-functions in canonical series form using Gauss-Hermite and Gauss-Laguerre quadrature methods, was able to develop analytical models that allow computation of detection probability of energy detectors in myriads of fading channels. This also facilitated modelling of spectrum sensing using (none) overlapping periodogram
• Developed stochastic approximation of geometric mean of multiple random variables yielding simple and very accurate analytical models for BER of multi-hop, multi-branch cooperative relay networks
• Developed optimum fusion rule to aggregate the detection results from multiple spatially distributed cooperative cognitive radio/ wireless sensor nodes
• Expressing natural logarithm in terms of exponential integral function, was able to develop a generalized expression for computing PHY layer secrecy rate and/or ergodic capacity of wireless system over a myriad of fading channels
• Employing opportunistic relaying protocols, uniquely improved the spectral efficiency of adaptive modulation in cooperative relay communication
• Implemented UCLA software defined Zigbee radio on USRP1 using GNU radio platform (C++ & Python)
• Implemented software defined OFDM transceiver; performed spectrum sensing of 900MHz and 2.4GHz radio frequency bands using USRP2 and MATLAB; installed and configured spectral monitoring test bed based on NI PXIe-5641R RIO IF transceiver
• Developed solid background in digital communication, information theory, adaptive filtering, signal detection and estimation, machine learning and artificial neural networks
• Mentored new graduate research assistants; coordinate research activities

Telecoms Implementation Project Manager

Confidential

Responsibilities:

• Managed telecoms implementation of more than 8 different projects with minimum CPI & SPI of 1.2 and profit margin of 25%; completed the deployment of SAP R/3 and enterprise software one month earlier than scheduled saving over $200,000 in OPEX cost; widely recognized throughout the company as an expert in earn value analysis and cost planning
• Achieved the highest customer loyalty index of 9.3/10 in the company by demonstrating excellent reporting and communication skills; improved site acceptance rate and inventory rotation period by 30% and 40% respectively by ensuring more accurate demand/supply forecast and creating more efficient site implementation and ordering process
• Directed and coordinated the entire project end-to-end operations in a cost and time efficient way within the customer team; responsible for equipment planning/order intake to equipment invoicing; managed the interface towards the customer in the delivery phase and in demand/supply chain issues;
• Improved service cost and equipment delivery efficiency by 20% by participating in contracting and vendor management process

Network Design Engineer

Confidential

Responsibilities:

• Responsible for network design and tuning activities in the project to ensure fulfilment of contractual targets and customer expectations within cost baseline; ensured appropriate claim management and quality standards for delivering the network design and tuning services in project scope
• Provided technical support to the customer; troubleshoot faulty implementation to isolate and resolve problems; participated in equipment testing in the test bed before delivery to customer site for implementation
• Subject matter expert on radio network coverage, capacity planning and optimization with excellent understanding of mobile network architecture, interfaces and standards (ITU/3GPP); handled telecoms equipment implementation planning; designed, implemented, and tested RF (GSM /3G 900/1800/2100 MHZ) and Microwave (3GHz, 7GHz, 13GHz, 15GHz, and 23GHz) antenna line
• Installed, configure and troubleshoot different Nokia Siemens BTS products e.g. BS-240, Metro site BTS, Ultra site BTS, Flexi BTS, Flexi EDGE BTS, Flexi 3G Node B; MW access products e.g. FlexiHopper, Fleximetro; MW backbone equipment e.g. SRT1F and SRT1C
• Integrated more than 200 backbone transmission equipment to BSCs and MSCs; managed the implementation of turnkey projects including installation of telecoms equipment, towers, generators, fuel tanks, power supplies, air conditions and so on