Method for frequency locking onto a pilot reference signal affec

Details Method for frequency locking onto a pilot reference signal affec Method for frequency locking onto a pilot reference signal affec

1996-06-13

1997-10-14

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4551822, 4551922, 455257, 455 71, 375344, H04B 116

Patent

active

056782152

ABSTRACT:
A radio receiver (700) uses automatic frequency control for locking a controlled reference signal (108) to a pilot reference signal (114) that has been distorted by multipath fading. The radio receiver (700) is programmed to sample the pilot reference signal (114) over a predetermined time interval to determine an average pilot frequency, and applies a first weighting function to the average pilot frequency to generate a weighted pilot frequency and a second weighting function to a controlled frequency of the controlled reference signal (108) to generate a weighted controlled frequency. The radio receiver (700) sums the weighted pilot frequency with the weighted controlled frequency to provide an update frequency, and modifies the controlled reference signal (108) such that its frequency matches the update frequency. The radio receiver (700) continues these programmed steps so as to lock the controlled reference signal (108) to the pilot reference signal (114).

REFERENCES:
patent: 4348772 (1982-09-01), Leland et al.
patent: 4630283 (1986-12-01), Schiff
patent: 4718116 (1988-01-01), Jacobs et al.
patent: 5249202 (1993-09-01), Hillum et al.
patent: 5361398 (1994-11-01), Christian et al.
patent: 5548811 (1996-08-01), Kumagai et al.

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