摘要
电力线数据通信系统一般都采用COFDM(CodedOrthogonalFrequencyDivisionMultiplexing)正交频分复用调制解调技术。通过对信道进行划分和对每个相邻子信道的相角差进行分解计算,设计出接收数据帧的同步协调解决机制,较好地解决了COFDM离散多载波调制系统的数据帧同步技术问题,为电力线的COFDM离散多载波通信提供了稳定高效的技术保证。
A new mechanism is designed which can provide more accurate synchronization for data frames between sending and receiving in power line communication system, and is very helpful for COFDM technologies which plays a main role in long wire line communication systems. In this mechanism, the channel of the wire line is divided into many sub-channels and the errors of phase angle for every two neighbor sub-channels can be obtained, the integer-sample-point phase errors and the fractional-sample-point phase errors can be separated with some calculations in complex mode. Based on the calculated phase errors, the mechanism can remove the integer-sample-point phase errors and fractional-sample-point phase errors by shifting the same sample points in the data frame or adjusting the coefficients of the frequency equalizers of the sub-channels, which can ensure a very accurate synchronization for the system. The experiment proves that it is successful.
出处
《电工技术学报》
EI
CSCD
北大核心
2005年第10期115-118,共4页
Transactions of China Electrotechnical Society
关键词
子信道
相角偏差
同步
频域均衡
Sub-channels, the error of phase angle, synchronization, frequency equalizer
