FQPSK-GMSK increased spectral efficiency, high performance - high speed 'dual use' telemetry system optimization

Period of Performance: 05/15/1998 - 02/15/1999


Phase 1 SBIR

Recipient Firm

Digcom, Inc.
44685 Country Club Dr.
El Macero, CA 95618
Principal Investigator


Modulation-RF transceiver technology Research & Development for high performance optimized 'dual-use' cost and spectrum efficient military/commercial system deployments is proposed. Phase-1 work will contribute to more than doubling of the data rate transmission capability of RF band-width-constrained operational air-to-ground telemetry systems. Inventions,FQPSK-GMSK Feher patented [1] systems and publications/test results,which have demonstrated that FQPSK is the most spectral and RF power efficient technology, will be used. Simultaneous optimization of parameters,including robust BEP performance, integrated coded-modem/radio and RF power efficient-Non Linearly Amplified (NLA), transceiver spectral saving designs are proposed. Transceiver performance optimization for complex interference, large and fast dynamic RF multi-path propagation changing enviroments of telemetry systems will be undertaken. System architectures,algorithms/coefficients and optimized not-coded and coded modem, fast synchronization and adaptive equalization systems will be developed. A new cost efficient generation of high performance FQPSK bit rate and RF frequency agile systems will be designed. The proposed work will contribute to enhanced performance TIER-1 telemetry developments, required by year 1999. Phase-1 will also include preliminary studies of optimized higher-order modulated NLA sytems, including trellis-coded NLA-QAM, FQAM, F-Mod and CPM-FM. These will further increase spectral efficiencies and could have TIER-2 and TIER-3 applications to the year 2010 and beyond.