Research on Coding Method of Polarization PLC System Based on Upper Bound of Bhattacharyya Parameter

Power Line Communication (PLC) channels are characterized by strong pulse interference, significant impedance changes, and severe signal attenuation. In order to effectively enhance the communication quality of PLC, channel coding emerges as a crucial technology. Polar codes have gained significant attention in the field of channel coding because of their simple encoding and decoding processes, as well as their potential to achieve the Shannon limit. A polarization PLC channel coding system is proposed to reduce the impact of pulse noise on information transmission in PLC channels. This system combines polar code and Orthogonal Frequency Division Multiplexing (OFDM). The initial value of the Bhattacharyya parameter under the PLC channel is determined using the Bhattacharyya parameter method and the PLC channel state information. The upper bound recursive method of Bhattacharyya parameter is used to estimate the reliability of polarization PLC sub-channel in the recursive construction range of Bhattacharyya parameter, so as to obtain the optimal information bit selection scheme. The validity of the Bhattacharyya parameter bounds in the PLC channel is verified by studying the performance of polar code with different parameters in the polarization PLC channel coding system. The performance is compared with that of Turbo code and low-density parity check code under the same conditions. The results show that the polar code coding structure in the polarization PLC channel coding system is clear. The decoding complexity of polar codes is low, and they perform better under certain SNR conditions, resulting in higher coding gain. The polarization PLC channel coding system can effectively improve the transmission reliability of PLC, and has a broad application prospect in the complex PLC channel.