Pulse or digital communications – Receivers – Automatic frequency control
Patent
1996-12-16
1998-04-14
Chin, Wellington
Pulse or digital communications
Receivers
Automatic frequency control
375376, 455255, 455265, 331 18, H04L 2707
Patent
active
057402051
ABSTRACT:
An automatic frequency control loop structure utilizes a dual selection automatic frequency control unit which is coupled to a differential phase unit and a coherent phase unit to provide a frequency corrected received signal output for efficient tracking of frequency offset drift; and a much lower probability of loss of automatic frequency control loop lock. Thus, a signal from a coherent carrier recovery process provides additional benefit by utilization in adjusting frequency offset tracking performance.
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"AFC Tracking Algorithms", Francis D. Natali, IEEE Trans. Commun., vol. COM-32, pp. 935-947, Aug. 1984.
"Burst Coherent Demodulation with Combined Symbol Timing, Frequency Offset Estimation, and Diversity Selection", Justin C.-I. Chuang & Nelson R. Sollenberger, IEEE Trans. Commun., vol. 39, No. 7, pp. 1157-1164, Jul. 1991.
Baum Kevin L.
Gurney David Paul
Kuffner Stephen Leigh
Chin Wellington
Motorola Inc.
Stockley Darleen J.
Tran Congvan
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