Diversity receiver with joint phase locked loop filter

Details Diversity receiver with joint phase locked loop filter Diversity receiver with joint phase locked loop filter

2005-08-30

2005-08-30

Phu, Phuong (Department: 2631)

Pulse or digital communications

Receivers

Interference or noise reduction

C455S137000, C455S132000

Reexamination Certificate

active

06937677

ABSTRACT:
Original RF carriers are recovered for first and second channels in a diversity receiver and used to de-rotate (demodulate) each of the first and second received signals. The pilot loop filters of each channel are cross coupled to create a joint pilot loop between both channels. The channel with the stronger signal provides a dominant influence on the frequency of the synthesized recovered RF carrier in the channel with the weaker signal. The phase locked pilot loops in both channels will tend to be frequency locked to the frequency of the stronger signal, leaving the respective phase locked pilot loops to make an individual phase adjustment for each channel.

REFERENCES:
patent: 3631344 (1971-12-01), Greenwald
patent: 3641437 (1972-02-01), Gurak et al.
patent: 3743941 (1973-07-01), Gans et al.
patent: 4406017 (1983-09-01), Takahashi
patent: 5325403 (1994-06-01), Siwiak et al.

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