US 11,757,491 B2
Communication device and method of operating a communication device
Markus Wobak, Graz (AT); Johannes Stahl, Graz (AT); and Ulrich Andreas Muehlmann, Graz (AT)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Jan. 6, 2022, as Appl. No. 17/647,285.
Claims priority of application No. 21152183 (EP), filed on Jan. 18, 2021.
Prior Publication US 2022/0231728 A1, Jul. 21, 2022
Int. Cl. H04B 5/00 (2006.01); H04B 1/408 (2015.01); H04B 1/525 (2015.01)
CPC H04B 5/0031 (2013.01) [H04B 1/408 (2013.01); H04B 1/525 (2013.01); H04B 5/0043 (2013.01); H04B 5/0062 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A communication device, comprising:
a transmitter configured to transmit one or more radio frequency signal pulses to an external object;
a receiver configured to receive one or more response signals in response to the radio frequency signal pulses transmitted by the transmitter;
a signal analyzer configured to detect one or more characteristics of the response signals, to compare the detected characteristics with predefined reference characteristics and to generate an output indicative of a result of comparing the detected characteristics with the predefined reference characteristics; and
a processing unit configured to determine at least one category to which the external object belongs based on the output generated by the signal analyzer, wherein the at least one category to which the external object belongs indicates whether the external object is a counterpart device of the communication device capable of directing communication signals to the communication device;
wherein the one or more characteristics of the response signals comprise steady state complex vector signal characteristics of the response signals or step response signal characteristics of the response signals.