A backscatter communication method, device and system based on polar code

Abstract

The invention discloses a polar code-based backscatter communication method, device and system, including: in the code rate detection stage, the backscatter tag performs initial polarization on the information to be sent with cyclic redundancy check bits added After encoding and backscatter modulation, it occurs to the reader; the reader demodulates the received information and decodes the polar code, and feeds back the obtained frozen bit error rate to the backscatter tag; in the redundancy supplementary stage, The backscatter tag reselects the code rate according to the obtained frozen bit error rate, performs polar code encoding and sends it to the reader; the reader demodulates the received information and calculates the log likelihood ratio, and compares the combined two After the information bit is judged by the log likelihood ratio of the stage, the cyclic redundancy check is performed on the judgment result. If the verification is passed, the judgment result is what is required, and the information transmission is completed, so that the transmission can be guaranteed under any channel conditions at the same time. The reliability and code rate are optimal, which greatly increases the communication distance.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to a backscatter communication method, device and system based on polar codes. Background technique [0002] In recent years, backscatter communication has been widely used in low-power IoT scenarios. Unlike traditional communication technologies, passive backscatter does not require high-power radio frequency devices (such as mixers, amplifiers, etc.), and carries its own data by reflecting wireless signals in the environment, thus greatly reducing power consumption And hardware cost, and can be made into a tiny volume, based on the above advantages, passive backscattering has become one of the most competitive Internet of things (IoT) solutions. [0003] The existing backscatter communication method controls the electromagnetic reflection and absorption by adjusting the antenna impedance, so as to realize the modulation of data. Due to the lack of power ampli...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a backscatter communication method, device and system based on polar codes, the purpose of which is to solve the problem of the prior art due to the large attenuation of backscatter signal transmission. Technical issues with shorter communication distances

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