Accession Number : ADD015682

Title :   High Data Rate Long Pulse Compression Waveform Communication System for M-Ray Encoding Voice Messages for Air Traffic Control Systems.

Descriptive Note : Patent, Filed 31 Jan 91, patented 13 Oct 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Waters, William H ; Linde, George J

Report Date : 13 Oct 1992

Pagination or Media Count : 14

Abstract : 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.

Descriptors :   *PATENTS, *NOISE REDUCTION, *INTELLIGIBILITY, *RADIO RECEPTION, BANDWIDTH, CODERS, CORRELATION, DECODERS, ERRORS, OUTPUT, PHASE, PULSE COMPRESSION, RATES, RECEIVERS, SEQUENCES, SIGNALS, TIME, TRANSDUCERS, TRANSMITTERS, VALUE, WAVEFORMS, NOISE(RADIO), RADIO TRANSMITTERS, RADIO RECEIVERS

Subject Categories : Radio Communications
      Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE