低压电力线OFDM系统中交织算法的改进

Improvement of interleaving algorithm in low voltage power line OFDM system

迎合智能电网的需求,采用先进的OFDM技术设计了低压电力线通信系统,由电力线信道特性,建立了合理的信道模型,并针对多径效应引起的频率选择性衰落和脉冲噪声引起的突发错误这两大难点,对此系统的交织算法做了改进,分别对时域和频域的连续错误进行了交织。仿真实验得出,改进后的交织算法更有效地将突发错误离散为随机错误,使系统误码率性能大约有2 dB的提高,实现了数据的更可靠传输,可广泛应用于低压电力线自动抄表领域。

To meet the needs of the intelligent power grid, the low voltage power line communication system is designed by advanced OFDM technology, the reasonable channel model is presented through the analysis of power line channel characteristic, and interleaving algorithm is improved that continuous mistakes of time domain and frequency are inter-leaved, according to these two difficulties：frequency selective fading caused by multipath effect and burst error caused by pulse noise.Following simulation experiment shows that burst errors are discrete into random ones more effectively which brings up the bit error rate performance of the system by 2 dB and achieves much more reliable data transmission, thereby the improved interleaving algorithm can be widely used in low voltage power line automatic meter reading field.