本文選題：正交頻分復用 + 電力線載波通信��； 參考：《西安電子科技大學》2015年碩士論文

【摘要】：隨著智能電網(wǎng)的迅速發(fā)展,對電力線載波通信(PLC)技術的研究成為熱點,一方面可以產生巨大的經濟效益,另一方面將推動我國PLC技術的發(fā)展。目前,國內的PLC載波芯片主要采用單載波與擴頻調制技術,僅限于普通的抄表功能�；谡活l分復用(OFDM)的PLC技術具有頻帶利用率高、抗信道衰落能力強、適合高速率傳輸、抗碼間干擾能力強的特點,可以滿足智能電網(wǎng)在可靠性、安全性、及時性等方面的要求,是新一代PLC芯片的核心技術,應用前景十分廣闊。本文主要研究基于OFDM的寬帶電力線載波通信系統(tǒng)的設計,主要工作如下:1、對低壓電力線信道特點進行了分析并建立仿真模型。介紹了OFDM技術的基本原理和實現(xiàn)過程,闡明了OFDM技術應用于電力線載波通信的優(yōu)勢。根據(jù)系統(tǒng)的設計目標和要求,結合信道特點,設計了電力線載波通信系統(tǒng)的整體方案,包括系統(tǒng)參數(shù)選擇、發(fā)射機方案和接收機方案。2、研究了基于OFDM的寬帶電力線載波通信的同步和信道估計算法,分析了同步誤差、頻偏及信道估計誤差對OFDM系統(tǒng)的影響,設計了接收機中基于前導的系統(tǒng)同步算法。結合本系統(tǒng)的實際情況,本文對傳統(tǒng)的符號同步、頻率同步和信道估計算法進行了改進。MATLAB仿真結果表明,改進后的算法性能可以達到系統(tǒng)的設計要求。3、針對載荷數(shù)據(jù)的特點設計接收方案,采用ROBO交織,使載荷數(shù)據(jù)可以對抗電力線信道的衰落特性,將Turbo碼與OFDM系統(tǒng)結合,可以增強系統(tǒng)的糾錯能力,從而在低信噪比時正確傳輸。仿真結果表明,設計的基于載荷數(shù)據(jù)的接收方案達到系統(tǒng)的預期性能要求。
[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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN913.6

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