中低压电力线互联通信中的信道均衡技术研究

针对10 kV中压电力线与220 V低压电力线信道互联通信时,由于二者信道特性存在差异,导致通信性能下降这一实际问题,提出了一种中低压电力信道互联实时均衡算法。算法基于SIFT快速傅里叶变换实时估计信道接收频谱,然后根据信道的慢时变特性,利用当前信道频谱特性结合前一时刻信道特性,估计出当前的信道均衡值,构成了一个闭环反馈环节。该算法实时性高,信道均衡性能良好,仿真实验证明,该算法有效提高了中低压电力线信道互联通信的性能。

面向中低压电力线互联通信的智能桥接器设计

为了实现10kV中压电力线与220V低压电力线信道的网络互联,设计了一种基于快速信道估计与信道均衡算法的智能桥接器系统。论文首先介绍了智能桥接器的系统组成以及工作原理。然后,详细分析了桥接器的核心部分——信道均衡器的工作原理及算法实现。该算法首先基于SIFT快速傅里叶变换,实时估计出信道的接收频谱;然后根据信道的慢时变特性,利用当前信道的接收频谱结合前一时刻的信道特性,估计出当前的信道均衡值,构成了一个闭环反馈信道均衡系统。测试表明,所设计的桥接器能满足中低压电力线互联通信的要求。

Modern Social Communications as a Bifurcation Point of Traditional Social Institutes

Impact of Internet Technologies increases importance of changes in the system of social communication creating a stressful situation for the functioning of traditionally established social institutions. New phenomena such as priest＇s and saints＇ online pages, represent significant deviation from historical practice, bring certain dissonance to the activities of the church. On one hand, church has to use modern communication channel, on the other hand, effects of online translation of confessional relations are not predictable. Open global socieW requires certain universalization of education, but professional communications are faced not only with a problem of language barrier, but also with national culture. School of thought, formed in traditions of particular cultural outlook, risks losing its face to the loss of national characteristics of the education system. Institute of Administration is also experiencing certain amount of stress.