| 摘要 |
PURPOSE:To prevent crosstalk of narrow band information by using a special code so as to apply spectrum diffusion to narrow band information within a band of broad band information. CONSTITUTION:The broad band information from an input terminal 11 and the narrow band information from an input terminal 12 modulate a carrier from an oscillator 13 by modulators 201, 202. The signal is subjected to band spread by a spectrum diffusion modulator 203, a synthesizer 204 synthesizes the result and the synthesized signal is sent from a transmitter 205. A reception station 250 uses a receiver 251 to receive the signal, a distributor 252 branches the signal, a spectrum diffusion demodulator 253 applies the inverse diffusion, an interference eliminating circuit 254 eliminates the broad band information of a demodulator 255 and a demodulator 256 demodulates the narrow band information. |
