Pulse or digital communications – Receivers – Automatic frequency control
Patent
1994-07-28
1997-01-14
Bocure, Tesfaldet
Pulse or digital communications
Receivers
Automatic frequency control
332126, 455136, H04L 2706
Patent
active
055947573
ABSTRACT:
A method and apparatus for digital automatic frequency control includes circuitry for frequency controlling a first information portion of a digital input signal, correlating the output with a known characteristic of the first information portion, and outputting a timing signal and channel estimation signal. The digital input signal is also decimated using the timing signal and frequency controlled into a frequency controlled output signal. This signal is used, along with a signal quality estimate derived from the channel estimation signal and first information portion, to determine an estimated frequency correction signal. The estimated frequency correction signal is used to control the frequency correction steps.
REFERENCES:
patent: 5107522 (1992-04-01), Kitayama et al.
patent: 5233633 (1993-08-01), Baum et al.
patent: 5311545 (1994-05-01), Critchlow
patent: 5341402 (1994-08-01), Matsushita et al.
Nelson Sollenberger and Justin Chuang, "Low-Overhead Symbol Timing and Carrier Recovery for TDMA Protable Radio Systems", IEEE Transactions on Communications, vol. 38, No. 10, Oct. 1990, pp. 1886-1892.
Bocure Tesfaldet
Motorola Inc.
Warren Raymond J.
Webster Bryan
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