Demodulation of quadrature amplitude modulation signals

Details Demodulation of quadrature amplitude modulation signals Demodulation of quadrature amplitude modulation signals

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

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