Demodulation communication signals in a near field radio frequency (RF) communicator
AssigneeInnovision Research & Technology PLC
InventorAndrew Williams
Life of this patent
Estimating the term…
Abstract
A near field RF communicator has an IQ demodulator and a demodulator processor that identifies a transition between logical states on the basis of either: 1) a magnitude obtained by adding a first value representing a difference between positive and negative peaks in the in-phase modulation and a second value representing a difference between positive and negative peaks in the quadrature phase modulation; or 2) whether a combined value representing a rate of change in the in-phase modulation and in the quadrature phase modulation exceeds a threshold.
Claims24
A near field radio frequency (RF) communicator, comprising:
- a coupler configured to receive a modulated RF signal by inductive coupling;
- a demodulator configured to receive the modulated RF signal, the demodulator comprising:
- a first multiplier configured to multiply the modulated RF signal by a first RF signal to produce an in-phase modulated signal, and
- a second multiplier configured to multiply the modulated RF signal by a second RF signal, in phase quadrature with the first RF signal, to produce a quadrature-phase modulated signal;
- and
- a demodulation processor comprising:
- a first and a second peak detector configured to detect negative and positive peaks in the in-phase modulated signal and the quadrature-phase modulated signal, respectively,
- a first difference calculator configured to determine a first difference between negative and positive peaks detected by the first peak detector,
- a second difference calculator configured to determine a second difference between negative and positive peaks detected by the second peak detector,
- a combiner configured to determine a length of a vector representing a difference between the negative and positive peaks by adding the first and second differences, and
- a controller configured to determine whether a logic state transition has occurred based upon the length of the vector to enable data to be extracted from the modulated RF signal.
A near field radio frequency (RF) communicator, comprising:
- a coupler configured to receive a modulated RF signal by inductive coupling;
- a demodulator configured to receive the modulated RF signal inductively coupled to the coupler, the demodulator comprising:
- a first multiplier configured to multiply the modulated RF signal by a first radio frequency signal to produce an in-phase modulated signal, and
- a second multiplier configured to multiply the modulated RF signal by a second radio frequency signal, in phase quadrature with the first radio frequency signal, to produce a quadrature-phase modulated signal;
- and
- a demodulator processor comprising:
- a rate of change determiner configured to determine a combined rate of change of the in-phase and quadrature phase modulated signals, and
- a determiner configured to compare the combined rate of change with at least one threshold to determine whether a logic state transition has occurred.
Dependencies are inferred from the claim text.