基于OFDM的宽带电力线载波通信系统设计

发布时间：2018-05-03 03:18

本文选题：正交频分复用 + 电力线载波通信　；参考：《西安电子科技大学》2015年硕士论文

【摘要】：随着智能电网的迅速发展,对电力线载波通信(PLC)技术的研究成为热点,一方面可以产生巨大的经济效益,另一方面将推动我国PLC技术的发展。目前,国内的PLC载波芯片主要采用单载波与扩频调制技术,仅限于普通的抄表功能。基于正交频分复用(OFDM)的PLC技术具有频带利用率高、抗信道衰落能力强、适合高速率传输、抗码间干扰能力强的特点,可以满足智能电网在可靠性、安全性、及时性等方面的要求,是新一代PLC芯片的核心技术,应用前景十分广阔。本文主要研究基于OFDM的宽带电力线载波通信系统的设计,主要工作如下:1、对低压电力线信道特点进行了分析并建立仿真模型。介绍了OFDM技术的基本原理和实现过程,阐明了OFDM技术应用于电力线载波通信的优势。根据系统的设计目标和要求,结合信道特点,设计了电力线载波通信系统的整体方案,包括系统参数选择、发射机方案和接收机方案。2、研究了基于OFDM的宽带电力线载波通信的同步和信道估计算法,分析了同步误差、频偏及信道估计误差对OFDM系统的影响,设计了接收机中基于前导的系统同步算法。结合本系统的实际情况,本文对传统的符号同步、频率同步和信道估计算法进行了改进。MATLAB仿真结果表明,改进后的算法性能可以达到系统的设计要求。3、针对载荷数据的特点设计接收方案,采用ROBO交织,使载荷数据可以对抗电力线信道的衰落特性,将Turbo码与OFDM系统结合,可以增强系统的纠错能力,从而在低信噪比时正确传输。仿真结果表明,设计的基于载荷数据的接收方案达到系统的预期性能要求。
[Abstract]:With the rapid development of smart grid, the research on power line carrier communication (PLC) technology has become a hot topic. On the one hand, it can produce huge economic benefits, on the other hand, it will promote the development of PLC technology in China. At present, PLC carrier chip mainly adopts single carrier and spread spectrum modulation technology, which is limited to ordinary meter reading function. The PLC technology based on orthogonal frequency division multiplexing (OFDM) has the characteristics of high frequency band utilization, strong anti-fading ability, suitable for high-speed transmission and strong anti-interference between codes, and can satisfy the reliability and security of smart grid. The requirement of timeliness is the core technology of the new generation PLC chip, and the application prospect is very broad. This paper mainly studies the design of broadband power line carrier communication system based on OFDM. The main work is as follows: 1. The characteristics of low-voltage power line channel are analyzed and the simulation model is established. This paper introduces the basic principle and realization process of OFDM technology, and expounds the advantages of OFDM technology in power line carrier communication. According to the design objectives and requirements of the system, combined with the characteristics of the channel, the overall scheme of the power line carrier communication system is designed, including the selection of system parameters. The synchronization and channel estimation algorithms of wideband power line carrier communication based on OFDM are studied, and the effects of synchronization error, frequency offset and channel estimation error on OFDM system are analyzed. The system synchronization algorithm based on leading in receiver is designed. Combined with the actual situation of the system, this paper improves the traditional symbol synchronization, frequency synchronization and channel estimation algorithms. MATLAB simulation results show that, The performance of the improved algorithm can meet the design requirements of the system. According to the characteristics of the load data, the receiving scheme is designed and the ROBO interleaving is adopted to make the load data resist the fading characteristic of the power line channel, and combine the Turbo code with the OFDM system. It can enhance the error correction ability of the system so that it can be transmitted correctly at low signal-to-noise ratio (SNR). The simulation results show that the proposed receiver based on load data meets the expected performance requirements of the system.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN913.6

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