文档介绍：西安电子科技大学
硕士学位论文
基于OFDM的电力线通信发射机的设计与FPGA实现
姓名:刘成茂
申请学位级别:硕士
专业:电路与系统
指导教师:杨刚
20100101
摘要
电力线载波通信技术(Power munication,PLC),是指以电力线作为
媒质进行数据、信息的传输和交换,近几年来一直是一个研究热点。其在家庭自
动化和家庭上网方面有着良好的前景,但其所使用的电力线信道存在多径干扰和
频率选择性衰落等缺点。而正交频分复用(Orthogonal Frequency Division
Multiplexing,OFDM)技术有效地克服了频率选择性衰落,并具有抗多径能力强、
频谱利用率高等特点,OFDM 已经成为电力线通信的核心技术之一。本文主要研
究了电力线通信系统上的 OFDM 调制系统,并设计了电力线通信发射机的硬件系
统。
本文首先描述了 OFDM 技术的基本原理,关键技术和在电力线通信应用中的
优缺点;然后在深入分析系统需求的基础上,提出了一种适合本课题实现的 OFDM
调制方案;最后根据系统设计的各项技术指标,给出了电力线通信发射机的硬件
实现方案。该方案采用 Cyclone III FPGA 实现 OFDM 基带处理,采用 AD9857 实
现数字上变频。本文详细说明了硬件系统的 FPGA 模块、上变频模块、滤波模块、
电源模块等模块的设计和实现。

关键词:电力线通信正交频分复用数字调制 Cyclone-III AD9857
Abstract
Power munication (PLC), which transmits messages in power line, will
play an important role in home automation work. But it has disadvantages of
multipath propagation and frequency selective fading. Orthogonal Frequency Division
Multiplexing (OFDM) can e frequency selective fading and has many good
features such as the strong ability to resist Inter Symbol Interference (ISI) and the high
rate of spectrum usage efficiency. OFDM has been a core technology in Power Line
Communications. The OFDM modulation scheme in PLC and the hardware design of
PLC transmitter will be discussed.
First, this paper describes OFDM fundamental principle, key techniques, and the
advantages and disadvantages in Power munication system. Then aiming at
PLC system requirement, an OFDM modulation scheme is proposed which is easy to
implement in the project. At last, a hardware design scheme of PLC transmitter is given
according to the desired system parameters. This scheme uses Cyclone III FPGA for
OFDM baseband processing and AD9857 for digital Up-Converter. This paper
introduces the design method and implementation of FPGA module, Up-Converter
module, filter module and power module.

Keywords: Power munication (PLC)
Orthogonal Frequency Division Multiplexing (OFDM)
Digital Modulation