Combiner-demodulator for phase shift keyed suppressed carrier si

Details Combiner-demodulator for phase shift keyed suppressed carrier si Combiner-demodulator for phase shift keyed suppressed carrier si

1975-06-23

1976-08-03

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325329, 325349, 325367, 329112, 329117, 329122, 329167, 329170, H03D 300

Patent

active

039732118

ABSTRACT:
Two signals received by spaced antennas or equivalent diversity receiving systems and having identical data signals, phase modulated on frequency-identical suppressed carrier signals, are combined to produce a more nearly error-free data output. Each input signal, after heterodyning, is multiplied by a distinct feedback signal to produce a phase-coherent carrier and a recovered data signal. Each carrier is filtered by a narrow bandpass filter and connected to a separate adder. The two multiplier outputs are also added together, then filtered in a low pass filter to provide a combined recovered data signal. This combined data signal is added separately to each coherent-phase carrier to provide the two distinct feedback signals for the input multipliers. When each carrier is phase modulated in quadrature with the same two data signals, the signals are phase shifted, after heterodyning, to separate the quadrature components. Each pair of in-phase components is demodulated as if it were detached from the other with the exception that the two multiplier outputs resulting from each carrier also are added and connected through a common bandpass filter before being added individually to the outputs of the corresponding low pass filters to produce the four feedback signals.

REFERENCES:
patent: 3906380 (1975-09-01), Querry et al.

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