| US 7,541,884 B2 | ||
| Methods and apparatus for crystal oscillator drift estimation and compensation | ||
| Mohammad A. Rahman, Allen, Tex. (US); and Umashankar S. Iyer, Plano, Tex. (US) | ||
| Assigned to Texas Instruments Incorporated, Dallas, Tex. (US) | ||
| Filed on Oct. 31, 2007, as Appl. No. 11/932,258. | ||
| Claims priority of provisional application 60/915863, filed on May 03, 2007. | ||
| Prior Publication US 2008/0273645 A1, Nov. 06, 2008 | ||
| Int. Cl. H03L 1/02 (2006.01); H04B 1/06 (2006.01); H04L 7/00 (2006.01); H04L 27/06 (2006.01) | ||
| U.S. Cl. 331—176 [375/344; 375/354; 455/257] | 25 Claims |
| 1. A system, comprising:
a frequency offset computation module;
a frequency drift estimation module coupled to the frequency offset computation module; and
a frequency error correction module coupled to the frequency offset computation module and the frequency drift estimation
module;
wherein the frequency offset computation module is configured to create a plurality of samples for each burst out of a plurality
of bursts; and
determine a plurality of frequency offsets for the plurality of samples, one frequency offset in the plurality of frequency
offsets for each sample in the plurality of samples;
wherein the frequency drift estimation module is configured to determine an intercept of the frequency drift based on the
plurality of samples and the plurality of frequency offsets corresponding to at most one burst; and
wherein the frequency error correction module is configured to compensate for long-term drift of a subsequent burst based
on the intercept.
|