Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1983-12-30
1985-09-03
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329122, 329124, 329154, 375 81, 375 88, 375 90, 375 94, 375110, H04L 2714
Patent
active
045395241
ABSTRACT:
Improved method and apparatus in the form of coherent demodulators for MSK signal or other angle-modulated carrier signals of substantially constant amplitude and continuous phase are provided. The coherent demodulators include a frequency doubler, a first mixer for multiplying the frequency doubled signal with a half clock signal to produce a carrier term signal, a bandpass filter for filtering the carrier term signal and a divider coupled to the carrier bandpass filter to produce a coherent carrier signal. The half clock signal is generated by multiplying the frequency doubled signal with the filtered ouput signal of the carrier bandpass filter by a second mixer, and bandpass filtering the output signal of the second mixer to produce the half clock signal. The received binary data modulated signal and the generated coherent carrier signal are input to a quadrature detector for recovering the binary data.
REFERENCES:
patent: 4027265 (1977-05-01), Kobayashi et al.
patent: 4028490 (1977-06-01), Epstein
patent: 4072905 (1978-02-01), Keelty
patent: 4100499 (1978-07-01), Monrolin
patent: 4229821 (1980-10-01), deJager et al.
patent: 4234852 (1980-11-01), McCorkle
patent: 4324001 (1982-04-01), Rhodes
patent: 4338574 (1982-07-01), Fujita et al.
patent: 4339725 (1982-07-01), Ichiyoshi
patent: 4361894 (1982-11-01), Kurihara et al.
patent: 4409562 (1983-10-01), Kurihara
patent: 4414675 (1983-11-01), Comroe
Rudi deBuda publication entitled, "Coherent Demodulation of Frequency-Shift Keying with Low Deviation Ratio", IEEE Transactions on Communications, Jun. 1972, pp. 429-435.
Frank Amoroso and James Kivett publication entitled, "Simplified MSK Signaling Technique", IEEE Transactions on Communications, Apr. 1977, pp. 433-441.
Frank deJager and Cornelis B. Dekker publication entitled, "Tamed Frequency Modulation, A Novel Method to Achieve Spectrum Economy in Digital Transmission", IEEE Transactions on Communications, vol. COM-26, No. 5, May 1978, pp. 534-542.
Gillman James W.
Grimm Siegfried H.
Jacobson, Jr. James E.
Motorola Inc.
Roney Edward M.
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