Interrogator and tag of wireless communication system
First Claim
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; and
a subcarrier signal modulating system that modulates the 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 subcarrier signal modulated by said subcarrier signal modulating system, the modulated main carrier being transmitted to the Interrogator through said receiving/reflecting system as the reflected signal.
1 Assignment
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Accused Products
Abstract
In a wireless communication system including at least one Interrogator and a plurality of Tags, the Interrogator transmits a main carrier signal, and each Tag transmits a reflected signal to the Interrogator in response to reception of the main carrier signal. The Tag Includes a receiving/reflecting system that receives the main carrier transmitted by the Interrogator and transmits the reflected signal to the Interrogator and a modulated subcarrier signal hopping system. The modulated subcarrier signal hopping system is provided with a frequency hopping system that applies frequency hopping to a subcarrier signal, and a subcarrier signal modulating system that modulates the subcarrier signal with a predetermined information signal. The Tag further includes a main carrier modulating system that modulates the main carrier received through the receiving/reflecting system with the modulated subcarrier signal, the modulated main carrier signal being transmitted to the Interrogator through the receiving/reflecting system as the reflected signal.
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Citations
22 Claims
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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:
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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; and
a subcarrier signal modulating system that modulates the 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 subcarrier signal modulated by said subcarrier signal modulating system, the modulated main carrier being transmitted to the Interrogator through said receiving/reflecting system as the reflected signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An Interrogator for a wireless communicating system including at least one Interrogator and a plurality of Tags, the Interrogator transmitting a main carrier signal, each of the Tags transmitting a reflected signal to the Interrogator in response to reception of the main carrier signal, said Interrogator comprising:
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a transmitting system that transmits the main carrier signal;
a reflected signal receiving system that receives a reflected signal, each of the Tags generating the reflected signal by modulating the main carrier transmitted from said Interrogator and received by the Tags;
a demodulating system that demodulates the reflected signal received by said reflected signal receiving system to output a demodulated signal; and
a data detection system that detects data from the demodulating signal, wherein said demodulating system simultaneously receives signals within a predetermined band including all the hopping frequency ranges defined by minimum hopping frequency and maximum hopping frequency of a subcarrier signal and applies demodulation to the received signals, wherein said data detection system includes;
a band dividing system that divides the demodulated signal into a plurality of bands to generate a divided band signal for each of the plurality of bands;
a decoding system that decodes the divided band signal to obtain data for each of the plurality of bands;
a sorting system that extracts frames from the divided band signals and sorts the extracted frames in accordance with a predetermined condition; and
a connecting system that connects the sorted frames chronologically. - View Dependent Claims (18, 19, 20)
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21. In combination, an Interrogator and a plurality of Tag for a wireless communicating, the Interrogator transmitting a main carrier signal, each of said Tags transmitting a reflected signal to said 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; and
a subcarrier signal modulating system that modulates the 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 subcarrier signal modulated by said subcarrier signal modulating system, the modulated main carrier being transmitted to the Interrogator through said receiving/reflecting system as the reflected signal, wherein said frequency hopping system is capable of applying the frequency hopping to the subcarrier signal with a plurality of hopping frequency intervals, and wherein said Tag further includes a hopping frequency interval selecting system that selects one of the plurality of hopping frequency intervals, said Interrogator comprising;
a reflected signal receiving system that receives a reflected signal, each of the Tags generating the reflected signal by modulating the main carrier transmitted from said Interrogator and received by the Tags;
a demodulating system that demodulates the reflected signal received by said reflected signal receiving system to output a demodulated signal;
a data detection system that detects a data signal from the demodulating signal;
a reception control system that controls said reflected signal receiving system to received a reflected signal modulated with a subcarrier signal having a hopping frequency interval narrower than a predetermined interval in a normal state; and
an identification information judging system that judges identification information of the Tag in accordance with the data signal detected by said data detection system, wherein, if said identification information judging system judges the identification information of said Tag, said reception control system controls said reflected signal receiving system to receive reflected signals modulated using the all ranges of hopping frequency intervals.
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22. In combination, an Interrogator and a plurality of Tag for a wireless communicating, the Interrogator transmitting a main carrier signal, each of said Tags transmitting a reflected signal to said 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; and
a subcarrier signal modulating system that modulates the 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 subcarrier signal modulated by said subcarrier signal modulating system, the modulated main carrier being transmitted to the Interrogator through said receiving/reflecting system as the reflected signal, wherein said frequency hopping system is capable of applying the frequency hopping to the subcarrier signal with a plurality of hopping frequency intervals, and wherein said Tag further includes a hopping frequency interval selecting system that selects one of the plurality of hopping frequency intervals, said Interrogator comprising;
a reflected signal receiving system that receives a reflected signal, each of the Tags generating the reflected signal by modulating the main carrier transmitted from said Interrogator and received by the Tags;
a demodulating system that demodulates the reflected signal received by said reflected signal receiving system to output a demodulated signal;
a data detection system that detects a data signal from the demodulating signal;
a demodulation control system that controls said demodulating system to demodulate a reflected signal modulated with a subcarrier signal having a hopping frequency interval narrower than a predetermined interval in a normal state; and
an identification information judging system that judges identification information of the Tag in accordance with the data signal detected by said data detection system, wherein, if said identification information judging system judges the identification information of said Tag, said demodulation control system controls said demodulating system to demodulate reflected signals modulated using the all ranges of hopping frequency intervals.
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Specification