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US 12,736,571 B2Granted
Near-field communication systems and methods for reducing beat frequency signals in the near-field communication systems
AssigneeNXP B.V.
InventorsMark Feichtinger, Wolfgang Hrauda, Ulrich Andreas Muehlmann
Life of this patent
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Abstract
A reader of a communication system and method uses a synthesized control signal to cancel a beat frequency signal of an incoming signal, where the beat frequency signal is due to a magnetic coupling of the reader with another reader. The control signal is synthesized using at least one parameter of the beat frequency signal, which is estimated based on the incoming signal.
Claims20
A reader of a communication system comprising:
- an antenna to receive an incoming signal, wherein the incoming signal includes a beat frequency signal due to a magnetic coupling of the reader with another reader;
- a sinusoidal estimator operably connected to the antenna, the sinusoidal estimator being configured to estimate a frequency and a phase of an external interference-related component of the beat frequency signal based on the incoming signal;
- at least one signal synthesizer coupled to the sinusoidal estimator, the at least one signal synthesizer being configured to synthesize a control signal using the frequency and the phase of the beat frequency signal;
- and
- at least one adder circuit operably connected to the antenna and the at least one signal synthesizer to subtract a signal portion from the incoming signal based on the control signal to cancel the beat frequency signal of the incoming signal.
2 more elements
A method comprising:
- receiving an incoming signal at a reader of a communication system, wherein the incoming signal includes a beat frequency signal due to a magnetic coupling of the reader with another reader;
- estimating a frequency and a phase of an external interference-related component of the beat frequency signal based on the incoming signal;
- synthesizing a control signal using the frequency and the phase of the beat frequency signal;
- and
- subtracting a signal portion from the incoming signal based on the control signal to cancel the beat frequency signal of the incoming signal.
2 more elements
A reader of a communication system comprising:
- an antenna to receive an incoming signal, wherein the incoming signal includes a beat frequency signal due to a magnetic coupling of the reader with another reader;
- a matching circuit connected to the antenna, wherein the matching circuit being configured to provide impedance matching;
- a sinusoidal estimator operably connected to the matching circuit, the sinusoidal estimator being configured to estimate a frequency and a phase of an external interference-related component of the beat frequency signal based on the incoming signal;
- at least one signal synthesizer coupled to the sinusoidal estimator, the at least one signal synthesizer being configured to synthesize a control signal using the frequency and the phase of the beat frequency signal;
- at least one adder circuit operably connected to the matching circuit and the at least one signal synthesizer to subtract a signal portion from the incoming signal based on the control signal to cancel the beat frequency signal of the incoming signal;
- and
- at least one analog-to-digital converter operably connected to the at least one adder circuit, the at least one analog-to-digital converter being configured to convert a resulting signal from the at least one adder circuit into a digital signal, wherein the digital signal represents the incoming signal.
4 more elements
Dependencies are inferred from the claim text.