| 摘要 |
PROBLEM TO BE SOLVED: To improve the S/N and distortion of an optical transmission line in the optical microcell communication system of TDMA mobile object communication. SOLUTION: This system is provided with antennas 11 and 12 for space diversity receiving the radio signals of received (n) channels, receivers 21 and 22 for amplifying and frequency-converting reception signals, an adder 3 for adding the signals of the respective receivers, a laser diode 7 for converting the added signals to optical signals, a detector 4 for detecting the reception level of the added signals, a DC bias generator 6 for deciding the DC bias of the laser diode by the output of the detector 4 and a timing controller 5 for controlling the timing of the DC bias generator. |
