Experiment on leaky coaxial cable transmission of digital terrestrial broadcast signals - technique of re-transmission of ISDB-T signals

摘要

We are developing the re-transmission systems of ISDB-T signals in buildings, tunnels and basements. One of the re-transmission techniques is the transmitting set of Leaky coaxial cable (LCX). The LCX was set on the aisle of the basement to avoid the noise, and measured the electric field strength and the bit error rate of re-transmitted signals by dipole antenna. The results showed that the electric field strength fluctuated as standing wave along the LCX, and this standing wave had deep fades. The degradation of the required CN ratio by the LCX transmission is less than 3dB.