CDMA mobile telephone

Details CDMA mobile telephone CDMA mobile telephone

2006-05-30

2006-05-30

Chin, Stephen (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S148000, C375S213000, C375S344000, C455S434000, C455S413000, C455S441000

Reexamination Certificate

active

07054352

ABSTRACT:
A CDMA mobile telephone allowing the drive mode to be automatically set and canceled without increasing the amount of hardware is disclosed. A frequency offset for each of N fingers is detected from despread data which are obtained by despreading received spectrum-spread data of M branches. Based on the detected N frequency offsets, it is determined whether the mobile telephone is moving at speeds higher than a predetermined speed. An operation mode of the mobile telephone switches between a drive mode and a normal mode depending on whether the mobile telephone is moving at speeds higher than the predetermined speed.

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Hsuan; Method and System For Tracking and Correcting Timing Errors in Communication Systems; Pub. No.: US 2003/0202488 A1; Pub. Date: Oct. 30, 2003.

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