4QAM-based passive tag backscattering power adaptive control method

Abstract

The invention relates to the field of passive tag backscattering power adaptive control methods, and discloses a 4QAM-based passive tag backscattering power adaptive control method, which comprises the following following steps: firstly, measuring a distance between a tag and a reader, and measuring an angle and a packet loss rate between the tag and the reader; according to the back scattering given power, the power during back scattering, the antenna gain of the tag and the antenna gain of the reader, solving the distance required by the measurement tag and the reader, and wherein the reader can know the packet loss rate during back scattering; sending then measured data to a label processor; and finally, when the detected backscattering link packet loss rate is small, solving the minimum backscattering given power, otherwise, raising the backscattering signal properly. According to the invention, the position and the angle of the reader reflected back are analyzed, the label processor module adjusts the backscattering power generated by the label circuit, and reasonable power is given and reflected back, so that the energy utilization of the tag is maximized.

Description

Technical field [0001] The present invention relates to the field of passive label reverse scattering power adaptive control method, and in particular, a self-adaptive control method based on 4QAM passive tag reverse scattering power is, Background technique [0002] In order to improve the throughput between the reader and the label, the 4QAM label is designed, but since the government stipulates that the transmit power of the reader, the passive tag can be obtained from the electromagnetic carrier transmitted to the label, the label receive power The restriction further affects the reverse scattering power of the label. The power of the label is partially used to work on the label circuit, and a portion of the reverse scattering signal reflects back to the reader in an electromagnetic wave form, and the power of the reverse scattering signal is limited to the reverse scattering. The signals of the RSSI and communication distance between the reader are limited. [0003] At prese...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of energy waste in the backscattering process of 4QAM tags in the prior art communication process between tags and readers in the uplink radio frequency, tags with limited energy absorption It is a big disadvantage, it is necessary to adjust the backscattering power generated by the tag circuit in the tag processor module, and give a reasonable power to reflect it back, so as to maximize the energy utilization of the tag

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