| US 7,457,374 B2 | ||
| DC offset cancellation for WLAN communication devices | ||
| Sascha Beyer, Ottendorf-Okrilla (Germany); and Matthias Lange, Dresden (Germany) | ||
| Assigned to Advanced Micro Devices, Inc., Sunnyvale, Calif. (US) | ||
| Filed on Oct. 21, 2004, as Appl. No. 10/970,238. | ||
| Claims priority of application No. 10 2004 021 225 (DE), filed on Apr. 30, 2004. | ||
| Prior Publication US 2005/0243953 A1, Nov. 03, 2005 | ||
| Int. Cl. H04L 25/06 (2006.01); H04L 25/10 (2006.01) | ||
| U.S. Cl. 375—319 | 59 Claims |
| 1. A method of transmitting information in a WLAN (Wireless Local Area Network) network wherein DC offsets are minimized,
comprising:
applying a start value of a correction signal to a data signal containing at least part of the information to be transmitted;
varying the correction signal;
determining for each different value of the correction signals, a strength of an indicator signal indicative of a dc offset;
identifying, based upon the determined strengths of the indicator signal, an optimum value of the correction signal at which
the strength of the indicator signal is at a local extremum, wherein identifying the optimum values comprises one of (1) repeatedly
varying the correction signal and determining the strength of the indicator signal until the local extremum is detected, (2)
comparing determined strengths of the indicator signal with each other, (3) calculating indicator signal strength differences,
(4) interpolating determined strengths of the indicator signal, and (5) calculating a derivative of determined strengths of
the indicator signal; and
setting the value of the correction signal to the identified optimum value.
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