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分段重复编码与数字滤波在G3标准PLC通信中的应用
黄明山,吴兰,刘楠嶓,张晓辉,歹志阳
0
(1.河南许继仪表有限公司,河南 许昌 461000;2.河南工业大学 电气工程学院,郑州 450001)
摘要:
G3标准电力载波通信以正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)为核心抑制多径效应,结合RS(Reed-solomon)和交织编码等纠正随机错误,提高可靠性。由于信道环境时变性明显,上述措施不能满足高可靠通信需求。针对这一问题,首先,提出了分段重复编码算法并应用于G3信号传输模型,通过对有效信息进行分段重复编码,增大信息通过低衰减信道的概率,提高可靠性;其次,设计了混合窗函数有限冲激响应(Finite Impulse Response,FIR)带通数字滤波算法对信号进行滤波处理,在保证相位的前提下,尽可能去除带外噪声干扰,优化OFDM的性能,并提高分段重复编码的作用。经性能测试,所形成的分段重复编码和FIR数字滤波的传输模型在平均误码率为10-2时有2~3 dB的性能提升,适合在强时变性和强噪声的信道中进行高可靠的通信传输。
关键词:  电力载波通信  时变信道  OFDM  分段重复编码  数字滤波  混合窗函数
DOI:
基金项目:国家自然科学基金资助项目(U1504616,61503123)
Application of segmented repeat coding and digital filtering in G3 standard PLC communication
HUANG Mingshan,WU Lan,LIU Nanbo,ZHANG Xiaohui,DAI Zhiyang
(1.Henan XJ Metering Co., Ltd.,Xuchang 461000,China;2.School of Electrical Engineering,Henan University of Technology,Zhengzhou 450001,China)
Abstract:
The power line carrier(PLC) communication based on G3 standard uses orthogonal frequency division multiplexing(OFDM) as the core module to suppress multipath effect.It combines Reed-Solomon(RS) and interleaved encoding to correct the random error and improve the communication reliability.Because the channel environment is complex and the time-varying characteristic is obvious,above measures can′t fulfill the high reliability of communication needs.Firstly,a segmented repeat encoding algorithm is proposed and applied to the G3 signal transmission model.Secondly,the finite impulse response(FIR) bandpass digital filtering algorithm based on mixed window function is designed to filter the signal.Under the premise of ensuring the phase,the filter can eliminate the interference of out band noise as much as possible,optimize the performance of OFDM,and improve the function of segmented repeat coding.Finally,through performance testing,the model of segmented repeat coding and FIR digital filtering has improved the performance of 2~3 dB when the average error rate is 10-2,and is suitable for high reliable communication transmission in strong time-varying and strong noise channels.
Key words:  power line carrier(PLC) communication  time-varying channel  OFDM  segmented repeat coding  digital filtering  mixed-window function
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