Direct conversion receiver for digital signals and method for demodulation of said signals
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United States of America Patent
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-
Jun 21, 1994
Grant Date -
N/A
app pub date -
Jan 31, 1992
filing date -
Jun 15, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a digital mobile system, to avoid distortions and fadings due to multiple propagation and the doppler shift, adaptive gain of the amplifier of a demodulator must be controlled with information derived from the signal at a high frequency. This is accomplished without the use of intermediate frequency selection filters by first demodulating the signal to base band, filtering out the desired signal and remodulating the desired signal to a higher frequency. From this remodulated signal the adjustable gain is controlled.
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