| 摘要 |
PURPOSE:To attain stable and accurate data demodulation by using a pseudo random code (PN code) so as to make a side lobe of autocorrelation function zero. CONSTITUTION:A generator for binary series signal (PN code) is constituted of PN code generators 1, 2, a correlation device 3, an exclusive OR circuit 4, multipliers 5, 6 and local oscillators 7, 8 for oscillation frequency fo. The PN code being a binary series signal at the A side uses an ordinary M series code and the PN being a binary series signal at the B side uses exclusive ORing of a clock(CLK) used for generating the M series code. Since the correlation output in this case has a waveform making the size lobe of the autocorrelation function zero, the PN code of the combination is used for spread spectrum communication. Thus, the date demodulation is implemented stably and accurately. |
