| 摘要 |
<p>PURPOSE:To realize the parallel spread spectrum modulator-demodulator in which trade-off between an information speed and an inter-code interference is remarkably improved and high speed processing is attained while providing the effect onto an interference wave, a disturbing wave and noise or the like. CONSTITUTION:A modulation section 10 gives an information signal d(t) such as a data to a serial/parallel converter 2 from an input terminal I1, in which the signal is converted into sets of low speed information d1(t), d2(t), d3(t) and the sets of information d1(t)-d3(t) are fed to multipliers 11-13 being components of a parallel spread spectrum SS modulation section. Then the sets of information d1(t)-d3(t) are added (3) and a resulting composite SS modulation signal is outputted. On the other hand, a demodulation section 40 applies demodulation by inverse spread to a signal resulting from a reception input signal subject to elimination of a high frequency interrupt signal component for a main lobe band of the spread code or over. Then N sets of low speed processing data obtained in this way are subject to parallel/serial conversion to obtain the original information. Then the low speed coding data is subject to parallel/serial conversion through an inter-code interference noise circuit of N sets of inverse spread demodulation section of the demodulation section 40.</p> |
