Title :
A frequency-hopped Ungerboeck-encoded 4-ary DPSK modem
Author :
Pizzi, Steven V. ; Leary, Patrick J. ; DeLellis, Joseph
Author_Institution :
GTE Gove. Syst. Corp., Needham Heights, MA, USA
Abstract :
The authors discuss the design of a frequency-hopped Ungerboeck-encoded 4-ary DPSK HF modem. First, they present a general channel model. Next, they present channel simulation results for rate-2/3 encoding of 8-ary and 4-ary differentially coherent DPSK. Both additive Gaussian white noise and Rayleigh fading channels are examined. The basic structure of the frequency-hopped waveform is elucidated, and it is shown how the Ungerboeck encoding is combined with the waveform to produce the frequency-hopped encoded modulation.<>
Keywords :
encoding; fading; frequency agility; military systems; modems; noise; phase shift keying; telecommunication channels; Gaussian white noise; Rayleigh fading channels; channel model; channel simulation; encoding; frequency-hopped Ungerboeck-encoded 4-ary DPSK modem; Convolution; Convolutional codes; Data communication; Differential quadrature phase shift keying; Euclidean distance; Fading; Frequency; Modems; Modulation coding; Phase shift keying;
Conference_Titel :
Military Communications Conference, 1988. MILCOM 88, Conference record. 21st Century Military Communications - What's Possible? 1988 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/MILCOM.1988.13381
