PERIODIC CALIBRATION FOR COMMUNICATION CHANNELS BY DRIFT TRACKING

Title:

PERIODIC CALIBRATION FOR COMMUNICATION CHANNELS BY DRIFT TRACKING

Document Type and Number:

WIPO Patent Application WO2005072299

Kind Code:

A3

Abstract:

A method and system that provides for execution of a first calibration sequence, such as upon initialization of a system, to establish an operation value, which utilizes an algorithm intended to be exhaustive, and executing a second calibration sequence from time to time, to measure drift in the parameter, and to update the operation value in response to the measured drift. The second calibration sequence utilizes less resources of the communication channel than does the first calibration sequence. In one embodiment, the first calibration sequence for measurement and convergence on the operation value utilizes long calibration patterns, such as codes that are greater than 30 bytes, or pseudorandom bit sequences having lengths of 2^N-1 bits, where N is equal to or greater than 7, while the second calibration sequence utilizes short calibration patterns, such as fixed codes less than 16 bytes, and for example as short as 2 bytes long.

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Inventors:

HAMPEL CRAIG E (US)
WARE FREDERICK A (US)
PEREGO RICHARD E (US)

Application Number:

PCT/US2005/002139

Publication Date:

November 02, 2006

Filing Date:

January 25, 2005

Export Citation:

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Assignee:

RAMBUS INC (US)
HAMPEL CRAIG E (US)
WARE FREDERICK A (US)
PEREGO RICHARD E (US)

International Classes:

H04B1/38; H04L7/00; H04L7/04; H04L7/10; H04L27/00

Foreign References:

US20020054648A1

2002-05-09

Other References: