Method and apparatus adapted to demodulate a data signal
DCFirst Claim
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1. A method of determining a data signal imposed on a phase jitter modulation (PJM) signal, the method comprising the steps of:
- providing a first phase jitter modulated signal;
applying a delay of less than one bit period to the first phase jitter modulated signal and obtaining a second phase jitter modulated signal;
comparing the first and second phase jitter modulated signals;
determining a phase difference as a result of the comparison between the first and second phase jitter modulated signals;
generating a recovery signal based on the comparison; and
reconstructing a data signal based on the recovery signal and an average DC value of the recovery signal.
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Abstract
The present invention relates to the field of receiving data and/or demodulating a data transmission signal. The present invention provides a method of and/or device for determining a data signal imposed on a phase jitter modulation signal. In one form, the invention relates to the field of Radio Frequency Identification (RFID), and the transmission of data between a tag and an interrogator.
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Citations
20 Claims
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1. A method of determining a data signal imposed on a phase jitter modulation (PJM) signal, the method comprising the steps of:
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providing a first phase jitter modulated signal; applying a delay of less than one bit period to the first phase jitter modulated signal and obtaining a second phase jitter modulated signal; comparing the first and second phase jitter modulated signals; determining a phase difference as a result of the comparison between the first and second phase jitter modulated signals; generating a recovery signal based on the comparison; and reconstructing a data signal based on the recovery signal and an average DC value of the recovery signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device adapted to demodulate a data signal imposed on a phase jitter modulation (PJM) signal, comprising:
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a receiver adapted to receive a first phase jitter modulated signal; delay means adapted to apply a delay of less than one bit period to the first phase jitter modulated signal and obtain a second phase jitter modulated signal; logic means adapted to compare the first and second phase jitter modulated signals, determine a phase difference as a result of the comparison between the first and second phase jitter modulated signals and generate a recovery signal based on the comparison; and a window detector configured to receive the recovery signal to reconstruct a data signal based on the recovery signal and an average DC value of the recovery signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A RFID system including a device, the device adapted to demodulate a data signal imposed on a phase jitter modulation (PJM) signal, the device comprising:
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a receiver adapted to receive a first phase jitter modulated signal; delay means adapted to apply a delay of less than one bit period to the first phase jitter modulated signal and obtain a second phase jitter modulated signal; logic means adapted to compare the first and second phase jitter modulated signals, determine a phase difference as a result of the comparison between the first and second phase jitter modulated signals and generate a recovery signal based on the comparison; and a window detector configured to receive the recovery signal to reconstruct a data signal based on the recovery signal and an average DC value of the recovery signal.
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Specification