Bandwidth Efficient Aeronautical Telemetry Modem and Transceiver Research
Final rept. 1 Nov 1997-30 Sep 1998
CALIFORNIA UNIV DAVIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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In RF power and spectral efficient digital communication systems, the transmitted signals are required to have both narrow-band spectrum and constant envelope. To meet these requirements, it is desirable to use spectrally efficient modulation techniques. FQPSK 1-2 and 16-state Superposed QAM 16-SQAM 1, 3, also called FQAM have been demonstrated to achieve higher power and spectral efficiency, and also show good error probabilities in NLA and Additive White Gaussian Noise AWGN channels. These signals contain offset property in quadrature Q channel 1 relative to in-phase I channel, which prevents the envelopes of the modulated signals from crossing zeros and allows to achieve higher power efficiency 2.
- Radio Communications