Multi-Transceiver RFID Reader System with Centralized Control and Frequency Source
First Claim
1. An RFID system comprising:
- a centralized frequency source that generates a reference signal having a frequency below an RF band of interest;
a centralized controller that generates a data signal having information related to at least one RFID tag;
a reader node, coupled to receive the reference signal and the data, the reader node comprising;
a communication and synchronization module that generates RFID tag commands and an RF carrier signal; and
a transceiver, coupled to receive the RFID tag commands and RF carrier signal, the transceiver modulating the RF carrier signal with the RFID tag commands and transmitting the modulated RF carrier signal into a read field.
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Accused Products
Abstract
Embodiments of the present invention provide RFID systems having a centralized frequency source and controller. The centralized frequency source generates a reference signal, having a frequency below the RF band of interest, which is transmitted to a plurality of reader nodes. The centralized controller generates and transmits data to the plurality of reader nodes. At each reader node, the reference signal is converted to an RF carrier signal that is modulated and transmitted within corresponding read field of the reader node. This modulated RF carrier signal may interrogate and communicate with one or more RFID tags within this read field. The RF carrier signal may also be held constant to enable communication from RFID tags to the reader node, which is subsequently transmitted back to the centralized controller or processor.
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Citations
20 Claims
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1. An RFID system comprising:
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a centralized frequency source that generates a reference signal having a frequency below an RF band of interest; a centralized controller that generates a data signal having information related to at least one RFID tag; a reader node, coupled to receive the reference signal and the data, the reader node comprising; a communication and synchronization module that generates RFID tag commands and an RF carrier signal; and a transceiver, coupled to receive the RFID tag commands and RF carrier signal, the transceiver modulating the RF carrier signal with the RFID tag commands and transmitting the modulated RF carrier signal into a read field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for generating a modulated RF carrier signal within an RFID system, the method comprising:
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generating a reference signal having a frequency below an RF band of interest; transmitting the reference signal to a plurality of reader nodes within the RFID system; increasing the frequency of the reference signal by applying a frequency multiplication operation to the reference signal resulting in an RF carrier signal, the frequency multiplication operation being performed on a first reader node within the plurality of reader nodes; and modulating the RF carrier signal with data prior to transmission into a read field of the first reader node within the plurality of reader nodes. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A communication and synchronization device in a reader node within an RFID system, the device comprising:
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a data processing/encoding module, coupled to receive a digital data signal from a centralized controller, the data processing/encoding module formats information within the digital data signal for transmission into a read field of the reader node and outputs a formatted digital data signal; and a frequency multiplier, coupled to receive a reference signal having a frequency below an RF band of interest, the frequency multiplier applies a frequency multiplication operation to the reference signal to increase the frequency of the reference signal to fall within the RF band of interest and outputs a corresponding RF carrier signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification