The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 2006
Filed:
Apr. 30, 2003
Stephen R. Carsello, Plantation, FL (US);
Stephen R. Carsello, Plantation, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A wireless receiverand corresponding method to detect a message identifier or preamble that has been generated and provided by a transmitteruses FFTs to estimate frequency and time offset. The wireless receiverscans, asynchronously and sequentially during a wakeup time, a plurality of predetermined frequencies for the message identifier or specialized preamble. A plurality of received sample sequences are collected, one received sample sequence collected at each of the plurality of predetermined frequencies. A correlation between data corresponding to the preamble and data corresponding to a received sample sequence is compared to a threshold value to determine when the preamble has been detected. The wireless receiveris wakened from a low power mode when the preamble is detected.