Mobile radio frequency identification (mRFID) reader
First Claim
1. A mobile radio frequency identification (mRFID) reader having a receiving circuit, the receiving circuit comprising:
- a local oscillator which generates a carrier signal at a predetermined frequency band;
a mixer which mixes a tag signal received from a tag with the carrier signal, to lower a frequency of the tag signal;
a phase adjusting block which adjusts a phase of the carrier signal by determining a phase of the tag signal; and
a control block which processes the tag signal through a series of operations, and controls an operation of the phase adjusting block to compensate for a phase delay of the tag signal according to an output of the processed tag signal,wherein the phase adjusting block detects a power of the tag signal and the phase of the tag signal corresponding to the detected power, finds a phase having a maximum tag signal power and delays the phase of the carrier signal by the phase having the maximum tag signal power.
1 Assignment
0 Petitions
Accused Products
Abstract
A mobile radio frequency identification (mRFID) reader having a receiving circuit is provided. The receiving circuit includes a local oscillator which generates a carrier signal at a predetermined frequency band; a mixer which mixes a tag signal received from a tag with the carrier signal, to lower a frequency of the tag signal; a phase adjusting block which adjusts a phase of the carrier signal by determining a phase of the tag signal; and a control block which processes the tag signal through a series of operations, and controls an operation of the phase adjusting block to compensate for a phase delay of the tag signal according to an output of the processed tag signal. Because the mRFID reader can be provided as small as a half size of a related art reader, a mobile communication terminal accommodating the mRFID reader can be compact-sized. Additionally, because the number of components for the receiving circuit decreases, not only the power consumption but also the unit price can be reduced.
14 Citations
13 Claims
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1. A mobile radio frequency identification (mRFID) reader having a receiving circuit, the receiving circuit comprising:
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a local oscillator which generates a carrier signal at a predetermined frequency band; a mixer which mixes a tag signal received from a tag with the carrier signal, to lower a frequency of the tag signal; a phase adjusting block which adjusts a phase of the carrier signal by determining a phase of the tag signal; and a control block which processes the tag signal through a series of operations, and controls an operation of the phase adjusting block to compensate for a phase delay of the tag signal according to an output of the processed tag signal, wherein the phase adjusting block detects a power of the tag signal and the phase of the tag signal corresponding to the detected power, finds a phase having a maximum tag signal power and delays the phase of the carrier signal by the phase having the maximum tag signal power. - View Dependent Claims (2, 3, 4, 5, 13)
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6. A mobile radio frequency identification (mRFID) reader having a receiving circuit, the receiving circuit comprising:
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a local oscillator which generates a carrier signal at a predetermined frequency band; a mixer which mixes a tag signal received from a tag with the carrier signal, to lower a frequency of the tag signal; a phase adjusting block which adjusts a phase of the carrier signal by determining a phase of the tag signal; and a control block which processes the tag signal through a series of operations, and controls an operation of the phase adjusting block to compensate for a phase delay of the tag signal according to an output of the processed tag signal, wherein the phase adjusting block comprises a phase delay unit which delays the carrier signal as long as a predetermined phase and provides the mixer with the delayed carrier signal, wherein the phase adjusting block further comprises a power evaluation unit which determines a power of the tag signal and the phase of the tag signal at a time that the power is detected, wherein the power evaluation unit detects an absolute value of the power, wherein the phase adjusting block further comprises a storage unit which stores an information comprising the absolute value of the power detected by the power evaluation unit, and the phase of the tag signal corresponding to the absolute value of the power, and wherein the power evaluation unit, on detecting a new absolute value of the power, stores the new absolute value of the power, only if the new absolute value of the power is greater than the absolute value of the power stored in the storage unit.
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7. A mobile radio frequency identification (mRFID) reader having a receiving circuit, the receiving circuit comprising:
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a local oscillator which generates a carrier signal at a predetermined frequency band; a mixer which mixes a tag signal received from a tag with the carrier signal, to lower a frequency of the tag signal; a phase adjusting block which adjusts a phase of the carrier signal by determining a phase of the tag signal; and a control block which processes the tag signal through a series of operations, and controls an operation of the phase adjusting block to compensate for a phase delay of the tag signal according to an output of the processed tag signal, wherein the phase adjusting block comprises a phase delay unit which delays the carrier signal as long as a predetermined phase and provides the mixer with the delayed carrier signal, wherein the phase adjusting block further comprises a power evaluation unit which determines a power of the tag signal and the phase of the tag signal at a time that the power is detected, wherein the power evaluation unit detects an absolute value of the power, wherein the phase adjusting block further comprises a storage unit which stores an information comprising the absolute value of the power detected by the power evaluation unit, and the phase of the tag signal corresponding to the absolute value of the power, and wherein the phase adjusting block further comprises a delay adjusting unit which controls such that the phase of the carrier signal is delayed at the phase delay unit as long as the phase stored in the storage unit. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification