Baseband differentially phase encoded radio signal detector

Details Baseband differentially phase encoded radio signal detector Baseband differentially phase encoded radio signal detector

1978-12-11

1981-02-24

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

375 80, 375 84, 455214, H04L 2722

Patent

active

042530679

ABSTRACT:
A radio signal is applied to an in phase detector channel and a quadrature phase detector channel. Each detector channel includes, in cascade arrangement; an in phase downconverter means for downconverting the received radio signal to a baseband signal; a sampling means for sampling the baseband signal at a predetermined rate; and a matched filter means matched to the symbol waveform and wherein the sample pulses are stored over a predetermined period of time that corresponds to two data symbols. The sum of the pulses for the first data symbol and the sum of the pulses for the second data symbol are compared to determine if there has been a phase reversal between the two data symbols. The outputs of the in phase and quadrature phase channels are summed, which results in demodulation of the encoded data.

REFERENCES:
patent: 3660764 (1972-05-01), Goell
patent: 3697881 (1972-10-01), Nakagome et al.
patent: 3993956 (1976-11-01), Gilmore et al.
patent: 4100499 (1978-07-01), Monrolin
Taub et al., "Principles of Communication Systems", McGraw-Hill, 1971, pp. 224-227, 383-385.
Simpson et al., "Fundamentals of Analog & Digital Communication Systems", Allyn & Bacon, 1971, pp. 317-321, 350-355.
Electronic Design, vol. 23, No. 26, Dec. 20, 1975, p. 16, "Speed of CCD Memory is Boosted Tenfold".
Amelio, "Physics and Applications of Charge-Coupled Devices", IEEE International Convention & Exposition, vol. VI, New York, Mar. 1973.
Reible et al., "Convolvers for DPSK Demodulation of Spread Spectrum Signals", IEEE Proceedings of the 1976 Sonics and Ultrasonics Symposium, pp. 451-455.
Kosonocky et al., "Basic Concepts of Charge-Coupled Devices", RCA Review, vol. 36, Sep. 1975, pp. 566-593.

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