WIRELESS SIGNAL CODING AND AUTHENTICATION

摘要

A system for authenticating a client wireless transceiver (105) in communication with a wireless access point (111), in a wireless data communications network, the system including: a wireless tagging device (103) modulating a security code onto a communications signal transmitted from an antenna (113) operatively connected to the client wireless transceiver (105) thereby transmitting a tagged communications signal; and a tag receiver (101), operatively connected to the wireless access point (111), the tag receiver (101) including a demodulator which demodulates the tagged communications signal and outputs a security signal including the security code. Preferably, the wireless tagging device includes a terminating load operatively connected to a tagging radiative element and the modulating is performed by changing matching impedance between the terminating load and the tagging radiative element.