To build nationwide synchronized time net using SDH network, we must study the time delay in SDH network transmissionpath.
利用SDH网络组建全国的时间同步网,需要研究s DH网络传递路径的时延和时延误差。
2
OFDM is a high transmission technology in the wireless propagation environment. It is fitted to transmit high-speed data in the wireless channel which has multi-pathdelay and Doppler frequency shift.