Data coding system
First Claim
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1. A passive transponder system comprising a central unit and a radio frequency transponder,the radio frequency transponder comprising:
- an RF-to-DC power converter unit arranged, in response to a radio frequency interrogation signal from the central unit, to obtain DC power from the RF interrogation signal; and
a modulating unit arranged, in response to the RF interrogation signal from the central unit, to code data to be transmitted to the central unit and represented by a number of symbols, using a coding system, the coding system comprising representing each symbol with a unique digital waveform obtained by switching between a high state and a low state, the RF-to-DC power converter unit generating higher DC power when the modulating unit is in the high state than the low state, and all the unique digital waveforms having a duty cycle greater than 50%.
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Abstract
A data coding system for coding data represented by a number of symbols is described. The system includes representing each symbol with a unique digital waveform. All the unique digital waveforms have a duty cycle greater than 50% or a duty cycle less than 50%.
37 Citations
8 Claims
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1. A passive transponder system comprising a central unit and a radio frequency transponder,
the radio frequency transponder comprising: -
an RF-to-DC power converter unit arranged, in response to a radio frequency interrogation signal from the central unit, to obtain DC power from the RF interrogation signal; and
a modulating unit arranged, in response to the RF interrogation signal from the central unit, to code data to be transmitted to the central unit and represented by a number of symbols, using a coding system, the coding system comprising representing each symbol with a unique digital waveform obtained by switching between a high state and a low state, the RF-to-DC power converter unit generating higher DC power when the modulating unit is in the high state than the low state, and all the unique digital waveforms having a duty cycle greater than 50%. - View Dependent Claims (3, 4, 5)
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2. A passive transponder system comprising a central unit and a radio frequency transponder,
the radio frequency transponder comprising: -
an RF-to-DC power converter unit arranged, in response to a radio frequency interrogation signal from the central unit, to obtain DC power from the RF interrogation signal; and
a modulating unit arranged, in response to the RF interrogation signal from the central unit, to code data to be transmitted to the central unit and represented by a number of symbols, using a coding system, the coding system comprising representing each symbol with a unique digital waveform obtained by switching between a high state and a low state, the RF-to-DC power converter unit generating higher DC power when the modulating unit is in the low state than the high state, and all the unique digital waveforms having a duty cycle less than 50%. - View Dependent Claims (6, 7, 8)
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Specification
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Current AssigneeNational University of Singapore
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Original AssigneeNational University of Singapore
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InventorsVasudevan Pillai, Kumar, Krishnasamy Maniam, Nuntha Kumar
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Primary Examiner(s)Fan, Chieh M.
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Application NumberUS09/513,295Time in Patent Office1,628 DaysField of Search375/211, 375/219, 375/237, 375/238, 375/239, 375/259, 375/359, 340/10.1, 340/10.4, 340/10.42, 340/825.57, 340/825.63, 370/205US Class Current375/238CPC Class CodesG01S 13/751 wherein the responder or re...G01S 13/758 using a signal generator po...H03M 5/08 Code representation by puls...
