| 摘要 |
PURPOSE:To reduce the time for establishing a synchronization, by bringing a transmission information data doubly to a spread modulation by a first M series and a second M series, on the transmitting side, forming it to a transmitting modulated signal, bringing a receiving modulated signal to a reverse spread demodulation by the second M series, on a receiving side, bringing further this demodulated signal to a reverse spread demodulation by the first M series, and demodulating a transmission information data. CONSTITUTION:When a clock CK1 is inputted to the second M series generator 10, a clock pulse CK2 is generated at every one period, and it becomes an input clock of the first M series generator 11. A transmission information data is spread modulation by a modulator 12, and thereafter, brought further to a diffused modulation by the second M series 10a by a modulator 13. In a receiving side, a signal 17a corresponds to a signal (r), and a signal 18a is the second M series 10a, therefore, a signal 19a becomes a signal 17aXa signal 18a, namely, a signal (r)Xthe second M series 10a becomes a signal (q). Also, a signal 19aXa signal 21a is equal to the signal (q)Xthe first M series 11a, a transmitting data (p) is demodulated, and a receiving data is obtained. |
