Receiver having equalizing demodulator and a non-equalizing...

Pulse or digital communications – Equalizers – Automatic

Reexamination Certificate

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Reexamination Certificate

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07065136

ABSTRACT:
A receiver (24) comprises a non-equalizing demodulator (48), an equalizing demodulator (46) and an output control selector (50). The non-equalizing demodulator (48) receives a modulated signal (44) and demodulates the modulated signal (44) to produce a first digital bit stream (54). The equalizing demodulator (46) receives the modulated signal (44) and equalizes and demodulates the modulated signal (44) to produce a second digital bit stream (52). The output control selector (50), coupled to the non-equalizing demodulator (48) and the equalizing demodulator (46), selectively delivers a first one of the first digital bit stream (54) and the second digital bit stream (52) for at least a predetermined period of time (30) before selectively delivering a second one of the first digital bit stream (54) and the second digital bit stream (52) responsive to a predetermined decision criterion (e.g., bit error rate68). The first one of the first digital bit stream (54) and the second digital bit stream (52) is different from the second one of the first digital bit stream (54) and the second digital bit stream (52).

REFERENCES:
patent: 5375143 (1994-12-01), Kazecki et al.
patent: 5586143 (1996-12-01), Whinnett
patent: 5659576 (1997-08-01), Critchlow et al.
patent: 5774785 (1998-06-01), Karlsson
patent: 6028901 (2000-02-01), Huynh et al.

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