Bandwidth Efficient Aeronautical Telemetry Modem and Transceiver Research
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1998
- Accession Number
- ADA386772
Entities
People
- Shih-ho Wang
Organizations
- University of California