Principal Systems engineer II Hughes Network systems/San Diego/Maryland/10/95-4/98
Contributed to the design of the air interface for the ICO’s GSM based satellite system, and managed the technical aspects for developing the base station receiver
Developed and simulated signal detection algorithms for the ICO’ base station GMSK receiver(using SPW and custom coded blocks)
Developed and evaluated channel fade estimation algorithms through simulation using C programming
Developed efficient symbol timing estimation algorithms for the ICO’s base station receiver (GMSK) and the Thrya geo-mobile satellite handset receiver(QPSK)
Developed signal processing and detection algorithms for GSM/LEO satellite receivers, simulated their performance using Fortran and were able to
close 1-dB gap to make the LEO handheld receivers feasible (at HNS)
Developed a 2-day GSM short course and presented to technical staff and management(notes are available). Wrote and published the 1st survey paper on GSM
Principal Engineer--Motorola Satellite Communication/Chicago/Arizona 1/92-9/95
Led the technical design of the Iridium’s gateway signaling protocol architecture based on the CCITT SS7 and the GSM protocols
Led and contributed to the development of Iridium inter-satellite routing algorithm
Developed models for the estimation of traffic, and cell handoffs in the Iridium system
Developed RF channel fade estimation models and developed simulation software for model verification
Analyzed test fade measurement data using SPW and C and extracted statistical parameters for channel characterization
Air/Ground HF communication links Engineering/Arinc/Principal Systems Engineer(1989-1992)r
Developed algorithm for handling connection handoffs in the airline industry’s HF link(plane to ground station)
Designed schemes for compressing the TCP/IP protocol for efficient transfer over air/ground links
Provided traffic analysis and network capacity upgrade for the Aeronatical packet switched network
Provided technology evaluation, led RFP preparation, and evaluated vendor’s network design proposals for migrating existing legacy networks based on x.2
and airlines ALC protocols into a single IP over frame relayed network architecture
High Speed Packet Switching Systems and Networks--GTE Laboratories/Member of Technical Staff (1985–1989)
Principal investigator in ATM switching systems and QoS design
Designed time-based prioritization protocols for packet queueing in output buffered high speed switches, and used mathematical modelling to analyse the
delay performance and published results in IEEE Comm Magazine
Designed an output-buffered ATM switch architecture (published in IEEE JSAC on communication)
Contributed to early high-speed packet networks research
Designed and implemented the signal processing algorithms for a 9600 baud voiceband modem
Researched, designed and simulated the performance of algorithms for signal timing detection, filtering and equalization etc in Fortran before implementing on
a Texas instrument TMS 32010 signal processing chip using firmware coding
