Radio-frequency carrier cancellation method and system
A technology of radio frequency carrier and carrier leakage, which is applied in the field of radio frequency identification, can solve problems such as high hardware resource requirements and complex radio frequency carrier cancellation methods, and achieve the effect of guaranteeing the effect and simplifying the method
Active Publication Date: 2017-12-01
JIANGSU BELLON TECH
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[0004] The purpose of the present invention is to provide a radio frequency carrier cancellation method and system, which solves the technical problems of complex radio frequency carrier cancellation methods and high requirements on hardware resources in the prior art
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[0036] The present invention will be described in detail below in conjunction with various embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.
[0037] It should be noted that in different implementations, the same symbols or signs may be used, but these do not represent an absolute relationship in structure or function. Moreover, the "first", "second" and the like mentioned in the various embodiments do not represent absolute distinctions in structure or function, and are merely for convenience of description.
[0038] Such as figure 1 As shown, a schematic diagram of a radio frequency circuit in an embodiment of the present invention. The radio frequency circuit includes modulator 11, balun 12, combiner 13, coupling unit 14, power detection unit 15, proc...
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The invention provides a radio-frequency carrier cancellation method and system. The radio-frequency carrier cancellation method comprises the following steps of fixedly setting I way of control voltage as a first voltage value; scanning Q way of control voltage within the adjustment range, obtaining corresponding first power voltage through a power detection unit, and determining a first control voltage value corresponding to the Q way of control voltage when the first power voltage is minimum; fixedly setting Q way of control voltage as a second voltage value; and scanning I way of control voltage within the adjustment range, obtaining corresponding second power voltage through the power detection unit, and determining a second control voltage value corresponding to the I way of control voltage when the second power voltage is minimum. According to the method and the system, a way of radio-frequency carrier cancellation is simplified and the effect of radio-frequency carrier cancellation is guaranteed.
Description
technical field [0001] The present invention relates to the technical field of radio frequency identification, in particular to a radio frequency carrier cancellation method and system. Background technique [0002] UHF radio frequency identification technology adopts zero intermediate frequency architecture. The communication between the radio frequency identification reader and the radio frequency identification electronic tag adopts a "half-duplex" method. After the radio frequency identification reader sends the command, it will continue to send the carrier to the Radio frequency identification tags to provide energy. Therefore, when the RFID reader is working, the high-power carrier wave it transmits may leak into the receiving link through various channels such as internal circuit crosstalk and antenna port reflection. Larger power carrier leakage will lead to poor linearity of the receiving link and distortion of useful signals. At the same time, the noise carried by...
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IPC IPC(8): H04B1/525
CPCH04B1/525
Inventor 王兵
Owner JIANGSU BELLON TECH