METHOD AND RFID READER FOR OBTAINING A BACKSCATTER MODULATED RECEIVE SIGNAL
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United States of America Patent
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Issued Date -
Dec 27, 2018
app pub date -
Jun 8, 2018
filing date -
Jun 8, 2018
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Abstract
The disclosed subject matter relates to a method for obtaining a backscatter modulated receive signal in an radio-frequency identification (RFID) system, comprising the steps: providing a carrier wave by a local oscillator; generating a transmit signal based on the carrier wave and an input signal; transmitting said transmit signal; receiving a backscatter modulated receive signal; and combining the receive signal with a cancel signal; wherein the method further comprises the step of determining a phase shift and an amplitude adjust from the corrected receive signal; wherein the determined phase shift is applied as a phase rotation when generating the transmit signal; and wherein the cancel signal is based on the un-shifted carrier wave and the determined amplitude adjust. The disclosed subject matter further relates to an RFID reader configured to perform said method.
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