| 摘要 |
<p>PURPOSE:To detect the frequency of a spread code at high speed and to acquire initial synchronization at high speed by controlling a reference code generating means based on the correlation output between a reference code and a received signal. CONSTITUTION:A phase comparator 14 receives a pulse generated from a peak detection circuit 13 and a pulse generated from a timing generating circuit and applies a voltage to a VCO 16 in a timing when both pulses are generated. When the synchronization is established, a circuit 48 generates a timing signal when one period of a spread code included in the received signal is coincident with the convolution integration region of a convolver 11. The pulse is used to reset a demodulation code generator 114 to apply inverse spread to a received spread signal, thereby decoding the original data. Consequently, the initial synchronization matching at the high speed is attained.</p> |
