High Data Rate Long Pulse Compression Waveform Communication System for M-Ray Encoding Voice Messages for Air Traffic Control Systems.
Patent, Filed 31 Jan 91, patented 13 Oct 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A communications system which decreases noise errors and increases information rate without sacrificing bandwidth is formed by a transmitter and a receiver designed to handle long pulse compression waveforms. An encoder connected to the transmitter converts a voice message into digitized voice words, encodes the digitized voice words into the time shifted code sequences, and phase modulates the long pulse compression waveform, producing a M-ary coded signal at the output of the transmitter, The receiver is connected to a decoder which includes at least one convolver for computing the correlation of received digitally coded words with independently generated time shifted code sequences, and a controller for generating a plurality of data values according to the largest correlation values, and a transducer responsive to the data values.
- Radio Communications
- Voice Communications