Preamble detection for wireless power ask communication
OwnerGiovanni Amedeo Cirillo, Gianluca De Piano +1inventors
InventorsGiovanni Amedeo Cirillo, Gianluca De Piano, Alessandro Alaimo
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Abstract
According to an embodiment, a preamble detection circuit includes a slicer that normalizes a demodulated Amplitude Shift Keying (ASK) signal to generate a binary waveform, a correlator that performs correlation with a reference preamble sequence, and decision logic that determines if a valid preamble is detected. The circuit enables a primary demodulation chain to remain in a low-power state until a valid preamble is identified, providing efficient preamble detection for wireless power transfer systems while minimizing power consumption during communication inactivity. The circuit's configurable parameters allow optimization for different operating conditions and communication protocols.
Claims20
A method for detecting a preamble in an Amplitude Shift Keying (ASK) signal, the method comprising:
- receiving a demodulated ASK signal at a preamble detection circuit;
- detecting a valid preamble or portions of a valid preamble sequence using the preamble detection circuit, the detecting comprising:
- normalizing the demodulated ASK signal to generate a normalized binary waveform with a configurable amplitude,
- performing a correlation between the normalized binary waveform and a reference preamble sequence to generate a correlated signal, wherein the correlation is performed for a configurable number of bits,
- estimating a parameter associated with the correlated signal, and
- determining whether the valid preamble has been detected based on the estimated parameter;
- and
- generating a trigger signal based on the detection of the valid preamble or portions of the valid preamble sequence.
A circuit for detecting a preamble in an Amplitude Shift Keying (ASK) signal, the circuit comprising:
- a slicer configured to normalize a demodulated ASK signal and generate a normalized binary waveform with a configurable amplitude;
- a correlator circuit coupled to the slicer and configured to perform a correlation between the normalized binary waveform and a reference preamble sequence to generate a correlated signal, wherein the correlation is performed for a configurable number of bits;
- an estimator circuit coupled to the correlator circuit and configured to estimate a parameter associated with the correlated signal;
- and
- a decision logic circuit coupled to the estimator circuit and configured to determine whether a valid preamble or portions of a valid preamble sequence has been detected based on the estimated parameter and generate a trigger signal in response to determining the valid preamble or portions of the valid preamble sequence.
A system for Amplitude Shift Keying (ASK) demodulation, the system comprising:
- a primary demodulation chain;
- and
- a preamble detection circuit coupled to the primary demodulation chain, the preamble detection circuit comprising:
- a slicer configured to normalize a demodulated ASK signal and generate a normalized binary waveform with a configurable amplitude,
- a correlator circuit coupled to the slicer and configured to perform a correlation between the normalized binary waveform and a reference preamble sequence to generate a correlated signal, wherein the correlation is performed for a configurable number of bits,
- an estimator circuit coupled to the correlator circuit and configured to estimate a parameter associated with the correlated signal, and
- a decision logic circuit coupled to the estimator circuit and configured to determine whether a valid preamble or portions of a valid preamble sequence have been detected based on the estimated parameter,
- wherein the primary demodulation chain is triggered in response to detecting the valid preamble.
Dependencies are inferred from the claim text.