采用LDPC信道编码方案的LoRa通信系统

LoRa Communication System Using LDPC Channel Coding Scheme

提出了一种基于低密度奇偶校验(LDPC)编解码作为信道编码方案的LoRa通信系统。经过权衡利用LDPC码编码以及LLR-BP解码替代汉明码,在不改变LoRa核心调制技术和参数定义的前提下,略去交织过程,并使系统具备了更好的误码性能,灵活支持较长的数据包的传输。仿真结果表明,在同一编码率下,当误码率(Bit Error Rate,BER)水平为10-3时,基于LDPC编解码作为信道编码方案的LoRa通信系统相较于传统系统信噪比性能能够放宽1.5 dB左右,该结果对于LoRa系统的各个扩频因子(SF)均成立,具有一定的参考价值。

A LoRa communication system based on LDPC codec as channel coding scheme is proposed.After trade-off,the system uses LDPC code encoding and LLR-BP decoding instead of Hamming codec,which can skip the interleaving process without changing the definition of LoRa core modulation technology and parameters,and make the system have better bit error performance and flexibly support the transmission of long data packets.The simulation results show that under the same coding rate,when the Bit Error Rate(BER)level is 10-3,the LoRa communication system based on LDPC codec as the channel coding scheme can relax the signal-to-noise ratio performance by about 1.5 dB compared with the traditional system,which is true for common SF of LoRa system,so the system can be considered to have certain reference value.