Carrier wave synchronization for multi-level two-dimensional mod

Details Carrier wave synchronization for multi-level two-dimensional mod Carrier wave synchronization for multi-level two-dimensional mod

1997-08-15

1999-12-28

Kinkead, Arnold

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

375327, 375326, 375264, 375261, 455265, H04L 2738

Patent

active

060086920

ABSTRACT:
In a method for realizing carrier wave synchronization in the receptio of a multi-level, two-dimensional modulation signal, the received signal is demodulated by using at least one local oscillator (3) in order to generate the local oscillator frequency. In the method, the local oscillator (3) performs a frequency scanning within the frequency range of the reception; during the frequency scanning, a demodulated signal point system is formed of the received signal by using the frequency generated by the local oscillator (3). Furthermore, the demodulated signal point system in the method is examined in order to determine at which point of time the frequency of the local oscillator is synchronized to the carrier wave frequency of the received modulation signal.

REFERENCES:
patent: 5600672 (1997-02-01), Oshima et al.
patent: 5621767 (1997-04-01), Brandt et al.

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