RFID IC with disturbance filter for digitally modulated signals
AssigneeNXP B.V.
InventorsChristian Weidinger, Heinz Umfahrer
Life of this patent
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Abstract
There is described an RFID IC, comprising: i) an RFID interface configured to receive a digitally modulated signal, wherein the digitally modulated signal comprises: a first slot with a first pulse, and a second slot with a second pulse; and ii) a processing unit configured to a) determine a first position of the first pulse in the first slot, b) filter a region that follows the determined first position of the first pulse, c) determine a second position of the second pulse in the second slot, and, if the second position of the second pulse cannot be determined in the second slot, assume that the second position of the second pulse in the second slot is at the filtered region.
Claims20
An RFID IC, comprising:
- an RFID interface configured to receive a digitally modulated signal, wherein the digitally modulated signal comprises:
- a first slot with a first pulse;
- a second slot with a second pulse;
- and
- a processing unit configured to determine a first position of the first pulse in the first slot, filter a region that follows the determined first position of the first pulse, determine a second position of the second pulse in the second slot, and if the second position of the second pulse cannot be determined in the second slot, assume that the second position of the second pulse in the second slot is at the filtered region.
A method of demodulating a digitally modulated RF signal, the method comprising:
- receiving the digitally modulated signal, wherein the digitally modulated signal comprises a first slot with a first pulse, and a second slot with a second pulse;
- determining a first position of the first pulse in the first slot;
- filtering a region that follows the determined first position of the first pulse;
- determining a second position of the second pulse in the second slot, and
- if the second position of the second pulse cannot be determined in the second slot, assuming that the second position of the second pulse in the second slot is at the filtered region.
Dependencies are inferred from the claim text.