Pulse or digital communications – Receivers – Angle modulation
Patent
1994-08-04
1995-09-12
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375336, 375348, 329300, H04L 2714
Patent
active
054504465
ABSTRACT:
The demodulator for digital modulation signals comprises a frequency detection device, an integral discharge filter, a summing device, a discrimination device, and a noise-compensating signal generation device. The frequency detection device outputs frequency detection signals by detecting frequencies of the digital modulation signals. The integral discharge filter outputs phase deviation signals by integrating the frequency detection signals for a given interval. The feedback summing device outputs compensated phase deviation signals to the discrimination device by feeding back the noise-compensating signals from the noise-compensating signal generation device to phase deviation signals from the integral discharge filter. The discrimination device outputs demodulation data by discriminating the deviation of the digital modulation signals based on the compensated phase deviation signals. The noise-compensating signal generation device outputs the noise-compensating signals based on the compensated phase deviation signals and the demodulation data. Also, another demodulator for digital modulation signals further comprises a compensation device for interference from preceding data in addition to the above construction. The compensation device for interference from preceding data outputs interference-compensated phase deviation signals by removing the interference from the preceding demodulation data from the compensated phase deviation signals.
REFERENCES:
patent: 3855539 (1974-12-01), Croisier
patent: 5003555 (1991-03-01), Bergmans
39th IEEE Vehicular Technology Confeence, 1-3 May 1989, San Francisco, California, vol. 1, pp. 44-49, Shigeru Ono et al.
40th IEEE Vehicular Technology Conference, 6-9 May 1990, Orlando, Florida, pp. 680-686, El-Tanany M. S. et al.
Nezu Toshikazu
Tanaka Koichiro
Chin Stephen
Matsushita Electric - Industrial Co., Ltd.
Phan Hai H.
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