Patent ID: 11867826
Assignee: SONITOR TECHNOLOGIES AS
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A mobile communication device configured to determine an identity of a transmitting device, comprising:
a transducer configured to receive an acoustic signal from the transmitting device via a plurality of transmission paths, wherein the acoustic signal comprises one of a plurality of code keys; and
a processing unit configured to:
correlate the received acoustic signal with a magnitude block window to determine a signal peak, the signal peak having a start and an end;
deconvolve the signal peak with each of the plurality of code keys to yield a set of valid code keys from the plurality of code keys, wherein the plurality of code keys comprise Quadrature Phase Shift Keying (QPSK)-encoded Complementary-Code-Keying (CCK) codes;
determine a first likelihood of correctness for each valid code key based on at least one parameter associated with the acoustic signal;
determine a second likelihood of correctness for each valid code key based on a time of arrival;
identify a code key associated with the identity of the transmitting device based on a joint likelihood of correctness based on the first likelihood of correctness and the second likelihood of correctness; and
determine a location of the mobile communication device using the identity of the transmitting device.