Physical Layer Coding Design for Backscatter Communication Based on Polar-LDPC Cascade Codes

Backscatter communication is attracting attention in the emerging field of radio communication as a core technology that supports the connection of a large number of devices and is able to transmit information using RF signals present in the environment. Because reflective tags are passive in design, i.e., they do not require additional energy, reflective communication has obvious advantages in terms of energy consumption and routine maintenance. However, existing reflective communication systems are unreliable due to the low strength of the transmitted signal and susceptibility to noise interference in the environment. For this reason, this paper proposes a code compilation scheme for reflex communication based on the cascading of Polar codes and LDPC codes. The reliability of the scheme is verified in terms of different excitation source time intervals, different signal-to-noise ratios, different signal attenuation degrees, and the presence or absence of an interleaver, using BER as an indicator. Through a large number of simulation experiments on Matlab platform, it is proved that the scheme proposed in this paper can reduce the influence of environmental factors on the communication quality and improve the reliability of the reflection communication system.