Communications: directive radio wave systems and devices (e.g. – Presence detection only
Reexamination Certificate
2008-09-09
2008-09-09
Sotomayor, John B (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Presence detection only
C342S028000, C342S057000, C342S125000, C342S107000, C342S108000
Reexamination Certificate
active
11492142
ABSTRACT:
According to the invention, IEEE 802.15.4a packets are used for communications, ranging and passive radar (detecting changes/motions, tracking objects in the environment) functionality. Changes and motions in the environment are detected by exploiting the specific preamble structure of the IEEE 802.15.4a packets. A sequence of packets transmitted through an environment is received. Each packet includes a preamble. The preamble in each packet is despread to update a reference multipath profile and to obtain a current multipath profile for a currently received packet. The reference multipath profile is compared with the current multipath profile to detect an object in the environment.
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Gezici Sinan
Sahinoglu Zafer
Brinkman Dirk
Mitsubishi Electric Research Laboratories Inc.
Mueller Clifton D.
Sotomayor John B
Vinokur Gene V.
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