Demodulators – Phase shift keying or quadrature amplitude demodulator – Input signal combined with local oscillator or carrier...
Patent
1996-06-18
1998-03-17
Grimm, Siegfried H.
Demodulators
Phase shift keying or quadrature amplitude demodulator
Input signal combined with local oscillator or carrier...
375233, 375264, 375266, 375327, 375345, H04L 2738
Patent
active
057291730
ABSTRACT:
A quadrature amplitude modulation demodulator for receiving a quadrature amplitude modulated signal having a suppressed pilot signal. In the demodulator, a receiver unit converts received quadrature amplitude modulated signal into a frequency converted signal and a signal at a phase 90 degrees shifted from this frequency converted signal. A synchronous detector unit performs synchronous detection on the signals outputted by the receiver unit by detecting a frequency difference between a carrier of the frequency converted signal and a reference signal. Then, a phase detector unit performs phase detection on the synchronous detected signals by detecting a phase difference included in the synchronous detected signals. A detector unit detects transmitted data from the phase detected signal. The present invention also provides a demodulator which can accurately detect transmitted symbols from a received quadrature amplitude modulated signal having a suppressed carrier component, and enters into a fully receivable state in a reduced time from the start of reception, and a receiver which determines optimal sampling timing and an optimal amplification factor for a received signal by independent control schemes without mutual interference.
REFERENCES:
patent: 4574246 (1986-03-01), Yoshida
patent: 5311546 (1994-05-01), Paik et al.
patent: 5400366 (1995-03-01), Iwamatsu
Grimm Siegfried H.
Taisei Electric Incorporation
LandOfFree
Demodulation of quadrature amplitude modulation signals does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Demodulation of quadrature amplitude modulation signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Demodulation of quadrature amplitude modulation signals will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-961507