Passive RFID transponder and RFID reader
AssigneeInfineon Technologies AG
InventorsWalter Kargl, Edmund Ehrlich
Life of this patent
Estimating the term…
Abstract
A passive RFID transponder includes a coder and a modulator. The coder generates a digital coded data stream based on a digital data stream to be transmitted. The digital coded data stream includes an initialization bit sequence having a maximum data frequency of the digital coded data stream. Furthermore, the digital coded data stream changes its value at the latest after a predefined number of bits. The modulator modulates an amplitude of a carrier signal with the digital coded data stream to provide an amplitude-modulated coded signal.
Claims19
A passive RFID transponder comprising:
- a coder configured to generate a digital coded data stream based on a digital data stream to be transmitted, the digital coded data stream including an initialization bit sequence having a maximum data frequency of the digital coded data stream, and to add at least one complementary bit to the digital data stream to be transmitted if the digital data stream to be transmitted does not change its value over more bits than a predefined number of bits;
- and
- a modulator configured to modulate an amplitude of a carrier signal with the digital coded data stream to provide an amplitude-modulated coded signal.
An RFID reader comprising:
- a receiver configured to receive an amplitude-modulated coded reception signal;
- a demodulator configured to demodulate the amplitude-modulated coded reception signal based on a carrier signal generated by the RFID reader to obtain a digital coded data stream;
- and
- a decoder configured to determine a maximum data frequency of the digital coded data stream, to provide a decoded digital data stream based on the maximum data frequency and to process digital coded data streams with different maximum data frequencies in order to generate decoded digital data streams.
A method of providing an amplitude-modulated coded signal, comprising:
- generating a digital coded data stream based on a digital data stream to be transmitted, the digital coded data stream including an initialization bit sequence having a maximum data frequency of the digital coded data stream;
- adding at least one complementary bit to the digital data stream to be transmitted if the digital data stream to be transmitted does not change its value over more bits than a predefined number of bits;
- and
- modulating an amplitude of a carrier signal with the digital coded data stream to provide the amplitude-modulated coded signal.
A passive RFID transponder comprising:
- a coder configured to generate a digital coded data stream based on a digital data stream to be transmitted, the digital coded data stream including an initialization bit sequence having a maximum data frequency of the digital coded data stream, and to assign a group of data bits with a defined number of data bits from the digital data stream to be transmitted to a coded bit sequence in order to obtain the digital coded data stream, a number of bits in the coded bit sequence being greater than the defined number of data bits, and not all bits in the coded bit sequence having the same value;
- and
- a modulator configured to modulate an amplitude of a carrier signal with the digital coded data stream to provide an amplitude-modulated coded signal.
A method of providing an amplitude-modulated coded signal, comprising:
- generating a digital coded data stream based on a digital data stream to be transmitted, the digital coded data stream including an initialization bit sequence having a maximum data frequency of the digital coded data stream,
- assigning a group of data bits with a defined number of data bits from the digital data stream to be transmitted to a coded bit sequence in order to obtain the digital coded data stream, a number of bits in the coded bit sequence being greater than the defined number of data bits, and not all bits in the coded bit sequence having the same value;
- and
- modulating an amplitude of a carrier signal with the digital coded data stream to provide the amplitude-modulated coded signal.
Dependencies are inferred from the claim text.