Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1988-04-26
1989-08-15
Mis, David
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329109, 329135, 375102, H04B 110
Patent
active
048578584
ABSTRACT:
In a digital radio transmission in which first- and second-channel radio frequency digital signals are transmitted respectively on othogonally polarized radiowaves and first and second IF signals are derived respectively from the first- and second-channel RF signals. The second IF signal is proportioned in response to a control signal and subtractively combined with the first IF signal. A main digital demodulator provides demodulation on the combined IF signals to generate a main (N+1)-bit output and derives an N-bit data signal from N higher significant bits of the (N+1)-bit output and an error component from the LSB of the main (N+1)-bit output. An auxiliary digital demodulator provides demodulation of the second IF signal to generate an auxiliary (N+1)-bit output and derives a data component of the second channel from the MSB of the auxiliary (N+1)-bit output. The derived error and data components are supplied to a correlator to generate the control signal.
REFERENCES:
patent: 4575862 (1986-03-01), Tahara et al.
patent: 4688235 (1987-08-01), Tahara et al.
Mis David
NEC Corporation
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