Anti-collision radio frequency recognizing method based on space division multiple access
A technology of radio frequency identification and space division multiple access, which is applied in the field of radio frequency identification based on space division multiple access, can solve the problems of unsatisfactory recognition effect, many identification blind spots, long time delay, etc., and achieve reduced dependence, simple hardware equipment, Avoid the effect of label conflicts
Pending Publication Date: 2008-09-24
TIANJIN UNIV
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However, since the beam direction and network parameters are fixed, the flexibility is poor, the time delay is long, there are many identification blind spots, and the identification effect is not ideal.
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[0037] The invention makes full use of the space information of each label, combines the adaptive antenna with the RFID system, controls the weighting coefficient through the software radio algorithm, and divides the space into multiple beam directions. The reader can control the main lobe directions of multiple beams of the antenna through the transmitting multi-beam forming algorithm to activate the tags in each direction, and then process the received signal at the back end through the receiving multi-beam forming algorithm to separate the feedback of each beam direction signal, and read the unique identification code to complete the communication process. According to different situations of label distribution in space, different adaptive strategies can also be adopted to achieve the purpose of improving throughput. The present invention will be further described in detail below in conjunction with basic principles, drawings and embodiments.
[0038] 1. Basic principle of...
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The invention belongs to a radiofrequency recognition technology field and relates to a radiofrequency recognition method based on space division multiple access (SDMA). The method includes the following steps: firstly, a plurality of emission beam directions are formed according to the distribution characteristics of an antenna array; every antenna element emission radiofrequency signal of the antenna array is controlled according to a plurality of determined emission beam directions and the received reflection signals of each labels are recognized to obtain a spatial distribution status of the labels; finally, different conflict prevention radiofrequency recognition strategies are determined according to the spatial distribution status of the labels, the width, the quantity, the direction and the strength of lobes of each emission beam are regulated, the antenna array element emission radiofrequency signals of the antenna array are controlled, and received echo signals of each label are processed. The method can realize a multi-channel simultaneous reading of the labels, and be used together with other conflict prevention algorithm cascades, thus effectively avoiding the happening of label conflicts.
Description
technical field [0001] The invention belongs to the technical field of ultra-high frequency (UHF) / microwave (MF) radio frequency identification (RFID), in particular to a radio frequency identification method based on space division multiple access. Background technique [0002] As an advanced automatic identification and data acquisition technology, RFID technology has broad application prospects in the fields of manufacturing, sales and circulation, and public safety. RFID technology takes wireless communication technology and large-scale integrated circuit technology as the core, and uses the spatial transmission characteristics of radio frequency signals to drive the electronic tag circuit to emit the unique code it stores. The label has a simple structure and is designed with integrated circuit technology, which can be mass-produced at low cost. [0003] The RFID system consists of four parts: electronic tags, readers, antennas and middleware. [0004] In terms of ope...
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Inventor 刘开华于洁潇闫格黄翔东
Owner TIANJIN UNIV