Method and wireless device employing a preamble to initiate...

Details Method and wireless device employing a preamble to initiate... Method and wireless device employing a preamble to initiate...

2006-09-12

2006-09-12

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

07106814

ABSTRACT:
A wireless receiver300and corresponding method to detect a message identifier or preamble that has been generated and provided by a transmitter200uses FFTs to estimate frequency and time offset. The wireless receiver300scans, 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 receiver300is wakened from a low power mode when the preamble is detected.

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