| 摘要 |
PROBLEM TO BE SOLVED: To extend transmission distance in optical space transmission.SOLUTION: In a transmission control part 31 of a communication apparatus which performs the optical space transmission, direct spread spectrum modulation of a transmission data signal is performed by a predetermined spread code sequence by a spreading part 120, a spread modulation signal is converted into a pulse signal synchronized with the spread code sequence by a pulse conversion part 130, and communication current Ib of a pattern according to the pulse signal is supplied to an LED part 12 of a signal light machine 10 by a light emission control part 140. Namely, the communication current Ib is superposed on light machine current Ia for presenting a signal to be supplied by a light machine-driving part 20 to be supplied to the LED part 12. |
