Method for detecting parallel transmission of multiple reflection devices in backscatter communication system
A reflective device and backscattering technology, applied in the field of communication, can solve the problems of not having multiple tags for parallel transmission detection, affecting the reading and writing speed of readers, and limiting system throughput performance, etc.
Active Publication Date: 2020-10-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
The disadvantage of the non-deterministic anti-collision algorithm represented by the ALOHA algorithm is that it is prone to tag starvation. The disadvantage of the deterministic anti-collision algorithm represented by the binary search algorithm is that when the number of tags is large, the depth of the query tree will be very deep. , affecting the reading and writing speed of the reader
Moreover, neither the deterministic anti-collision algorithm nor the deterministic anti-collision algorithm can truly realize the parallel transmission detection of multiple tags, which limits the throughput performance of the system
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[0041] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0042] First, if figure 1 As shown, the backscatter communication system proposed by the present invention includes an access point (such as an RFID system reader, or an access point of other types of backscatter communication systems) and M (M≥1) reflecting devices;
[0043] like figure 2 As shown, all reflective devices reflect signals to the access point at the same time;
[0044] like image 3 As shown, each reflective device described includes:
[0045] Backscatter antenna module: used to receive and reflect the signal of the environmental access point;
[0046]Backscatter modulation module: change the load impedance of the antenna according to the information symbol to realize backscatter modulation;
[0047] Microcontroller module: used to control the communication process of the reflection device;
[0048] Signal processor module: us...
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The invention belongs to the technical field of communication, and particularly relates to a method for detecting parallel transmission of multiple reflection devices in a backscatter communication system. According to the method, for a system of one access point and a plurality of reflection devices, after received signals are clustered through an expectation maximization algorithm, constellationpoints of the received signals are classified, and finally clustering of the constellation points is completed; transition information of signal constellation points is received according to bit boundaries of different reflection devices; the clustered clusters are divided into a high-level group and a low-level group according to the hopping condition of different reflection devices at the bit boundary by utilizing the level hopping characteristic of FM0 coding at the bit boundary, and the data of the reflection devices is decoded according to a corresponding division mode. According to theinvention, parallel transmission detection and decoding of a plurality of reflection devices can be realized without channel state information and pilot frequency.
Description
technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a detection method for parallel transmission of multiple reflection devices in a backscatter communication system. Background technique [0002] The backscatter communication system uses the reader to generate and send a radio frequency sinusoidal carrier to the nearby backscatter device (hereinafter referred to as the reflection device) (that is, the tag) to provide energy and carry the reflection device information back to the reader. Its typical representative is RFID technology. The RFID reader sends a sinusoidal carrier wave to the tag. Part of the signal received by the tag is used for energy harvesting to meet the normal operation of the tag circuit, and the other part is used for backscattering to transmit the tag information to the reader. device. Backscatter communication technology can free tags from the shackles of batteries, solve the energy proble...
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IPC IPC(8): H04L1/00
CPCH04L1/0056H04L1/0083
Inventor 梁应敞杨刚袁冬冬
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA