Patent ID: 7224712
Filing Date: 2007-05-29
Classification: G06K

Abstract:
1. A Tag for a wireless communication system including at least one Interrogator, the Interrogator transmitting a main carrier signal, said Tag transmitting a reflected signal to the Interrogator in response to reception of the main carrier signal, said Tag comprising: a receiving/reflecting system that receives the main carrier transmitted by the Interrogator and transmits the reflected signal to the Interrogator; a modulated subcarrier signal hopping system, which includes: a frequency hopping system that applies frequency hopping to a subcarrier signal to generate a frequency hopping subcarrier signal; and a subcarrier signal modulating system that modulates the frequency hopping subcarrier signal with a predetermined information signal; a main carrier modulating system that modulates the main carrier received through said receiving/reflecting system with the modulated frequency hopping subcarrier signal modulated by said subcarrier signal modulating system, the modulated main carrier being transmitted to the receiving/reflecting system, the receiving/reflecting system transmitting said modulated main carrier as the reflected signal to the Interrogator.