39. Generalversammlung von CENELEC

Ohne Zusammenfassung     

42. Generalversammlung von CENELEC

Ohne Zusammenfassung     

A semi-hidden Fritchman Markov modeling of indoor CENELEC A narrowband power line noise based on signal level measurements

To achieve error-free communication on the narrowband power line communication (NB-PLC) channel, there is need for constant measurement campaign and modeling of burst errors resulting from noise, perturbation and disturbances on the channel. This work thus reports a signal level measurement and First-Order Semi-Hidden Fritchman Markov modeling of the three major NB-PLC noise types for a typical South African residential and laboratory indoor low voltage environment. Two distinguishable disturbance scenarios: mildly disturbed and heavily disturbed were considered and Baum–Welch maximum likelihood estimation (MLE) algorithm is used to obtain the most probable model parameters that statistically depict the experimentally measured noise error sequences.     

T.38协议栈中ASN.1模块的改进设计

T．38协议栈作为IP网络传真代理的核心部分必须具有同时处理多个用户传真消息的能力,为此,在改进传统ASN.1实现方案的基础上,提出了一种ASN．1模块在T．38协议栈的设计方案。