CONTROL STATION APPARATUS, BASE STATION APPARATUS, AND OPTICAL TRANSMISSION METHOD

摘要

Frequency conversion units(104a to 104n)multiply modulated transmission signals by a local signal and convert the frequency of transmission signals to an intermediate frequency.Filter units(105a to 105n)attenuate a frequency region other than a desired signal region for the transmission signals after the frequency conversion.E/O units(106a to 106n)convert the transmission signals from electric signals to optical signals and output them to O/E units(151a to 151n)of a base station apparatus(150).The O/E units(151a to 151n)convert the optical signals to electric signals.Filter units(152a to 152n)attenuate a frequency region other than a desired signal region for the transmission signals after converted to the electric signals.Frequency conversion units(154a to 154n)multiply the transmission signals by a local signal,convert the frequency of transmission signals to a radio frequency,and output the transmission signals after the frequency conversion to amplifiers(155a to 155n).