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US 9,287,827 B2Granted
System and method to demodulate a load modulated signal
AssigneeQUALCOMM Incorporated
InventorsRaviKiran Gopalan, Koorosh Akhavan, Le Nguyen Luong
Life of this patent
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Abstract
A method includes demodulating a load modulated signal at an initiator device based at least partially on a phase adjusted comparison value corresponding to the load modulated signal.
Claims36
A method comprising:
- generating, at demodulation circuitry of an initiating device, a comparison value based on a first sample of a load modulated signal received at the initiating device and based on a second sample of the load modulated signal;
- adjusting, at the demodulation circuitry, a phase component of the comparison value to generate an adjusted comparison value;
- and
- selecting, at the demodulation circuitry, a logical value based on the adjusted comparison value.
1 more element
An apparatus comprising:
- means for generating a comparison value based on a first sample of a load modulated signal received at an initiating device and based on a second sample of the load modulated signal;
- means for adjusting a phase component of the comparison value to generate an adjusted comparison value;
- and
- means for selecting a logical value based on the adjusted comparison value.
1 more element
An apparatus comprising:
- a decision filter configured to generate a comparison value based on a first sample of a load modulated signal received at an initiating device and based on a second sample of the load modulated signal;
- a multiplier configured to adjust a phase component of the comparison value to generate an adjusted comparison value;
- and
- a decoder configured to determine a logical value based on the adjusted comparison value.
1 more element
A non-transitory computer readable storage medium comprising instructions that, when executed by a processor, cause the processor to:
- generate a comparison value based on a first sample of a load modulated signal received at an initiating device and based on a second sample of the load modulated signal;
- adjust a phase component of the comparison value to generate an adjusted comparison value;
- and
- select a logical value based on the adjusted comparison value.
1 more element
A method comprising:
- generating, at an initiator device, a comparison value based on a difference between a weighted version of a first set of samples of a bit period of a load modulated signal and a weighted version of a second set of samples of the bit period;
- adjusting a phase component of the comparison value based on a phase offset detected during a signal acquisition of the load modulated signal to generate an adjusted comparison value;
- and
- selecting a logical value corresponding to the bit period based on the adjusted comparison value.
1 more element
An apparatus comprising:
- means for generating a comparison value based on a difference between a weighted version of a first set of samples of a bit period of a load modulated signal and a weighted version of a second set of samples of the bit period;
- means for adjusting a phase component of the comparison value based on a phase offset detected during a signal acquisition of the load modulated signal to generate an adjusted comparison value;
- and
- means for selecting a logical value corresponding to the bit period based on the adjusted comparison value.
1 more element
An apparatus comprising:
- a decision filter configured to generate a comparison value based on a difference between a weighted version of a first set of samples of a bit period of a load modulated signal and a weighted version of a second set of samples of the bit period;
- a multiplier configured to adjust a phase component of the comparison value based on a phase offset detected during a signal acquisition of the load modulated signal to generate an adjusted comparison value;
- and
- a maximum likelihood decoder configured to decode a logical value corresponding to the bit period based on the adjusted comparison value.
1 more element
A non-transitory computer readable storage medium comprising instructions that, when executed by a processor, cause the processor to:
- generate a comparison value based on a difference between a weighted version of a first set of samples of a bit period of a load modulated signal and a weighted version of a second set of samples of the bit period;
- adjust a phase component of the comparison value based on a phase offset detected during a signal acquisition of the load modulated signal to generate an adjusted comparison value;
- and
- decode a logical value corresponding to the bit period based on the adjusted comparison value.
1 more element
Dependencies are inferred from the claim text.