| Power line communication uses power line as communication media for data transmission and information exchange. With the advancement of the technologies of modulation, transmission and signal procession, power line communication is developing all the while; Multi-carrier modulation substitutes for single carrier modulation and data rate increases from a few Kilobits to several Megabits. At present, power line communication comes into an era to develop with high speed. Because power line communication has several advantages, such as no need of new wire and low cost, it has drawn a lot of attentions in the fields of intelligent home LAN and broadband access. Orthogonal Frequency Division Multiplexing (OFDM) is a critical technology for the realization of broadband power line communication. It is a type of multi-carrier modulation and a technology of multiplex. OFDM utilizes several sub-carriers which are orthogonal with one another to transmit information, thus, the utilization of frequency band is enhanced greatly and the frequency selective fading and time variation in power line channel can be overcome effectively.The thesis introduces the conception and the development of power line communication first, studies the characteristics of the power line channel, sets up a channel model for use. For the deep comprehension of OFDM, the thesis introduces the principle of OFDM briefly, analyzes the advantages to apply OFDM in power line communication, and discusses some critical technologies in OFDM. Then, the thesis analyzes the regulations about PHY and MAC in power line communication specification HomePlug 1.0 in detail, sets up a power line communication simulation model based on OFDM and compatible with HomePlug 1.0 by MATLAB, dose some data simulation and system analysis about the critical technologies in OFDM and the whole simulation system. At last, the thesis describes the design of a power line modem based on the power line transceiver chip INT5200 made by corporation Intellon. |
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