| 摘要 |
The invention provides a radio station apparatus which converts a plurality of inputs digital transmission signals whose data transmission rates are different into an analog signal, modulates the analog signal with a radio carrier frequency and transmits the modulated signal, and a signal transmission method through radio station apparatus. The radio station apparatus of the present invention includes indoor unit 10, outdoor unit 20, and coaxial cable 60 which connects indoor unit 10 and outdoor unit 20 to each other. An inputted first binary digital signal is converted into a serial second binary digital signal by parallel/serial converter 2 and modulated by amplitude shift keying (ASK) into a third binary digital signal by modulator 13 with carrier f3 (Hz) whose frequency is a common multiple of respective value of n (sampling number)xm (quantization bit number) times the data rate of all inputted data. The third binary digital signal is multiplexed by frequency division multiplexing with another signal or signals by multiplexer 3 and transferred to outdoor unit 20 through coaxial cable 60. In outdoor unit 20, transferred third binary digital signal is demultiplexed and converted into an analog signal by a D/A converter.
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