| 摘要 |
PROBLEM TO BE SOLVED: To expand the use range of a wireless LAN using a transmission line, even if the existing transmission line is not suitable for the transmission of a radio signal.SOLUTION: A frequency conversion system includes: a frequency control device which connects a radio base station to a transmission line; and a frequency control device which connects an antenna to the transmission line. The frequency control device converts a radio signal input from the radio base station or the antenna into a transmission frequency band signal, which is not used in a broadcast signal and transmittable through the transmission line, to output to the transmission line. The frequency control device also converts a transmission frequency band signal among signals input from the transmission line into a signal of a radio signal frequency band, to output it to the radio base station or the antenna. |
