| 摘要 |
PURPOSE:To obtain a stable, efficient radio communication system, by imposing frequency conversion on a received signal from each slave station at a master station side with the same carrier as a carrier sent to the slave stations, and obtaining modulation signal of IF for every slave station and performing modulation. CONSTITUTION:A carrier signal of single frequency f1 is transmitted from the antenna 3 of the milliwave circuit part 100 of the master station to respective slave stations. The plural slave stations receiving the carrier signal impose frequency conversion on the signal f1 to signals f1+fS1, f1+fS2... by modulating wave signals of IFs fS1, fS2... generated for the respective slave stations and transmit the resulting signals to the master station. Those signals f1+fS1, f1+ fS2... are mixed at the master station by the signal f1 and the frequency converted signals fS1, fS2... are obtained for demodulation. |
