应用于工频通信中的纠错编码研究论文吴松霖.docVIP

华北电力大学本科毕业设计（论文）  PAGE 25 摘 要 电力线双向工频通信系统(TWACS)能够跨变压器台区长距离传输，基于该技术较传统电力线载波通信具有需要设备少、设备成本低、安装维护方便等优势。 但电力线并非专门的通信线路，配电网的信道环境尤其恶劣，对工频通信的传输非常不利。提高通信系统可靠性的方法有很多，一方面可以采取相应的手段比如在信号的检测环节应用匹配滤波、小波法等信号处理方法，另一方面由于噪声干扰强、畸变信号的调制功率受到限制，通过纠错编码可进一步提高数据传输成功率也必不可少。 针对配电网数据结构复杂，安全性要求高，突发干扰极易出现的情况，对比汉明码、BCH码、RS码的纠错性能与编码效率，对于极易出现突发差错的配电网工频通信系统选择进行RS编码。根据不同长度的数据对传输效率与编码增益的要求不同，对较短的数据选择RS(15,11)码和RS(31,23)码进行的纠错方法，而较长的数据，选择RS(127,115)码进行检错纠错。对于不满足RS码信息位码字长度的采用在编码前添加少量二进制0bit信息，译码后删减掉即可还原原有效信息。 通过大量仿真实验，验证了本文分析方法的有效性。 关键词：双向工频通信系统，纠错编码，误码率，编码增益 Abstract The powerline TWACS system (TWACS) long-distance transmission across distribution transformers based on the technology than traditional power line carrier communication need less equipment, and low equipment costs, easy installation and maintenance advantages. The power line is not dedicated communication lines, distribution network of channel environment is especially harsh, very unfavorable to the transmission of power frequency communication. There are many ways to improve the reliability of communication systems, on the one hand can take the appropriate means to match filtering, wavelet method, and signal processing methods such as aspects of the application in signal detection, on the other hand, due to strong noise, the modulation of the distortion signal power is restricted, by error correction coding can further improve the success rate of data transmission is also essential. Complex structure for distribution network data security requirements, the burst interference prone, compared to the Hamming code, BCH code, RS code error correction performance and coding efficiency, frequency prone to burst errors with grid workcommunication system to select the RS coding. According to the different length of data transmission efficiency and the requirements of the coding gain, shorter data, select the RS (15,11) code and RS (31,23) code for error correction method, and the longer the data, select the RS (127,115) code for error dete