| 摘要 |
PURPOSE:To improve the effect of interference elimination and to eliminate the interference between channels of the spread spectrum communication system, by inserting a BPF having almost the same characteristic as a BPF for interference signal of each reception side, between a data modulator and a scattering modulator of each channel of the transmission side. CONSTITUTION:A carrier wave from a carrier wave oscillator 21 of the transmission side is applied to a data modulator 22, and the carrier wave is modulated with data applied from a data input terminal 23. This modulated signal is applied to a transmission band pass filter 24 having almost the same characteristics as those of the interference wave reproducing BPF provided at the channel of each reception side. The point of change in data band-limited at the filter 24 is provided with waveform distortion such as constriction, the signal is inputted to a scattering modulator 25, where the signal is modulated with the scattering code from a scattering code input terminal 26, and a vector scattering modulation signal is outputted from a transmission signal output terminal 27. The effect of elimination of interference between channels is increased by using the BPF at the reception side, allowing to reduce the interference between the channels of the spread spectrum communication system. |
