| Power line network is a kind of physical network, which connects thousands of family and extends in all directions. People have been sick for realizing data communication by this kind of natural network, however Intersymbol Interference (ISI, Intersymbol Interference) and frequency selective fading caused by multipath effect and environment of noise have important influence for communication over power line. In recent years, Low voltage power line high rate communication technology have been researched deeply in foreign country and obtained some progress, but in our country, mainly focused on application and introduction of developed technique scarcely involved communication techniques in detail. Therefore, it will advance the application and development of low voltage power line communication technique in our country by deeply researching on the theory and vital techniques of power line communication. This dissertation deeply researched and analyzed on correlative techniques, which are the application of multicarrier spreading spectrum theory to low voltage power line high-speed data communication.The simulation model of characteristic of low voltage power line channel is the foundation for researching low voltage power line communication technique. Currently, as for problems of the model of power line, most research aim at the characteristic of power line as communication channel, it is difficult to find out a definite analysis formula or mathematics model to describe the model of power line channel. In the dissertation, in term of transmission theory, we obtained transfer statistic model of low voltage power line for the tree distributed structure indoors, the parameters that can reflect the channel character of distribution network in the scope of 1-30MHz is measured actually and analyzed, and from measure results show inherent relation between fading weighting factor and loading impedance. We built the rational spectrum model of background noise,...
|
PDF Full Text Request