Method for code division reservation and space division reading of active radio frequency tag
A radio frequency tag, active technology, applied in the field of communication, can solve the problems of code collision, inability to accurately identify tags, etc.
Inactive Publication Date: 2011-06-15
PEKING UNIV
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[0006] By using active tags and orthogonal codes as reservation codes for tag detection, multiple tags can be detected in the same time slot, which brings great convenience to tag identification technology (reference: H.Guo, Y.Zhao, A study of two-dimensional reservation MAC protocol for wireless communication systems. IEEE Conf. on Wireless Communications, Networking and Mobile Computing. Sept. 2007 Page(s): 2165-2168), but at the same time, this technology will also produce code collisions, making the reader Unable to accurately identify the label
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[0052] The time axis is divided into multiple time slots, each time slot includes three short time slots: reservation short time slot, ACK short time slot, tag data load transmission short time slot, as shown in Figure 4. The following briefly describes what happens in a time slot:
[0053] 1. The tag randomly selects a time slot, sends its reservation code in the code reservation short time slot, and then waits for the reader's feedback;
[0054] 2. After the reader receives the reservation code, it analyzes in the ACK short time slot, and then informs the tags that are being reserved, which tags can send data and which cannot;
[0055] 3. In the short time slot of tag data payload transmission, those tags that are allowed to send data send payload data. Those tags that have sent the reservation code but have not obtained the right to send data in this time slot, return to the initial state, repeat the above process, that is, randomly select a time slot, reserve and wait for permis...
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The invention discloses a method for the code division reservation and space division reading of an active radio frequency tag, which pertains to the field of communication technology. In the code division reservation method, a reader firstly utilizes the orthogonality of reserved codes to separate the reserved codes, then uses the separated reserved codes to independently obtain the incident direction of each tag, calculates an antenna array direction vector at^ and channel estimation ht^ corresponding to the tag according to the incident direction of each tag, restructures tag information yt^,compares the restructured tag information yt^ with the original information yt of the tag and chooses tags without reservation collision to send out data; the space division reading method calculates inclined projection operators according to the antenna array direction vector of the tag and then separates the data load of a plurality of tags according to the inclined projection operator of each tag. The method can effectively improve the reading efficiency of the reader as well as provide the position of a target object.
Description
Technical field [0001] The invention relates to a label reservation and data reading method in label detection, in particular to a code division reservation and space division reading method of an active radio frequency label, and belongs to the technical field of communication. Background technique [0002] RFID is a non-contact automatic identification technology that has developed rapidly in recent years. [0003] Radio-Frequency Identification RFID (Radio-Frequency Identification RFID) uses wireless two-way non-contact data communication to identify targets. It is similar to the barcodes of goods bought in stores. Compared with barcodes, it has the advantages of rapid identification, flexible methods, wide adaptation to occasions, and high degree of intelligence. , Will bring revolutionary changes to industries such as retail, logistics and medicine. RFID identification technology and application have been implemented as a major project in the field of advanced manufacturing t...
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IPC IPC(8): G06K7/00
Inventor 郭宏博赵玉萍
Owner PEKING UNIV