Pulse or digital communications – Repeaters – Testing
Patent
1989-02-21
1990-12-11
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
H04K 100
Patent
active
049775782
ABSTRACT:
A spread spectrum communication system having a modulation unit for modulating and spreading an information signal by one or more of carrier signals and a spread code and transmitting it as a radio wave, and a demodulation unit for despreading and demodulating a received radio wave to pick up the information signal. The modulation unit includes a synthesizing and modulating unit for synthesizing a first primary modulated signal obtained by modulating a first carrier by the information signal and a second primary modulation signal obtained by modulating a second carrier, and a spectrum spreading unit for spreading the synthesized first and second primary modulation signals with a spread code to generate a spread spectrum signal containing first and second spread signal components. The demodulation unit includes a separation unit for separating a received spread spectrum signal into the first and second spread signals, a spread signal reproduction unit for reproducing the spread code on the separated first and second spread signal component, and a despreading unit for despreading the separated first spread signal component and reproduced spread code to reproduce the information signal.
REFERENCES:
patent: 4217586 (1980-08-01), McGuffin
patent: 4309769 (1982-01-01), Taylor
patent: 4701434 (1987-10-01), Jasper
patent: 4785463 (1988-11-01), Jane et al.
Ishigaki Yukinobu
Mizuno Ken-ichi
Cangialosi Salvatore
Victor Company of Japan Ltd.
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