Pulse or digital communications – Systems using alternating or pulsating current – Amplitude modulation
Patent
1995-03-17
1998-01-27
Marcelo, Melvin
Pulse or digital communications
Systems using alternating or pulsating current
Amplitude modulation
375300, H04B 138, H04B 140
Patent
active
057128766
ABSTRACT:
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 f.sub.3 (Hz) whose frequency is a common multiple of respective value of n (sampling number).times.m (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.
REFERENCES:
patent: 4755773 (1988-07-01), Ohmagari
patent: 4907291 (1990-03-01), Yamamoto
patent: 4934983 (1990-06-01), Miyo
Ohmagari Shinichi
Yoshizawa Yasunori
Marcelo Melvin
NEC Corporation
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