Low power wireless communication system and protocol
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United States of America Patent
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N/A
Issued Date -
Dec 22, 2005
app pub date -
Jun 16, 2005
filing date -
Jun 17, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A wireless communication system and protocol are disclosed. The system includes at least one tag and at least one access point. The access point transmits a beacon signal that includes a predetermined binary sequence such as a pseudonoise (PN) sequence. The tag typically does not include an expensive accurate frequency generator component, such as a crystal oscillator. The tag searches for the beacon signal using a fast Walsh transform. Specifically, the tag performs fast Walsh transforms on received data to locate the beacon signal. Once the beacon signal is located, an accurate frequency reference signal can be established at the tag, allowing the tag and access point to transfer information to one another via a wireless, spread spectrum communication link.
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