Pulse or digital communications – Repeaters – Testing
Patent
1983-05-09
1986-04-15
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 56, 375 85, 375 86, 329104, 332 10, H04L 2718
Patent
active
045832382
ABSTRACT:
A transmission system is provided with a transmitter (10) transmitting data in series, either individually or in groups, by phase shifts applied to a transmitter carrier between characteristic instants which are separated by equal time intervals. The system further comprises a receiver (20) which is sensitive to phase shifts in the transmitter carrier between the characteristic instants. The transmitter comprises a coder (2) which causes the data to be transmitted to correspond to discrete values of a shift, and a symbol synthesizer (3) under the control of the coder to generate the waveform of the phase variation between two successive characteristic instants. This waveform is continuous and has minimum gradient and can be expressed as a function of time by a polynomial law. The receiver uses a synchronous demodulation and a correlation method to recover the characteristic instants and also the frequency drift between the transmitter carrier and the receiver carrier.
REFERENCES:
patent: 4008373 (1977-02-01), Nash et al.
patent: 4146841 (1979-03-01), McRae
patent: 4216543 (1980-08-01), Cagle et al.
patent: 4320499 (1982-03-01), Muilwijk et al.
patent: 4346472 (1982-08-01), Ohkoshi et al.
patent: 4373151 (1983-02-01), Houdard et al.
Alta Frequenza, vol. 40, No. 2, Feb. 1971, Milano, Italy, G. Vettori, "Digital Generation of a Linear FM Pulse of Given Time-Bandwidth Product, pp. 140-146.
IEEE Transactions on Vehicular Technology, Vo. V.T. 30, No. 3, Aug. 1973, New York, US, S. Asakawa et al, "A Compact Spectrum Constant Envelope Digital Phase Modulation", pp. 102-111.
IBM Technical Disclosure Bulletin, vol. 17, No. 12, May 1975, J. F. Dubil et al, Stored Waveform Technique for DPSK Modem.
Boisseau Alain
Pivon Claude
Safourek Benedict V.
Societe Anonyme dite: Sintra-Alcatel
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