| 摘要 |
<p>PROBLEM TO BE SOLVED: To enhance the communication quality by reducing correlation distortion at changeover of a spread code used for modulation information. SOLUTION: M sets of correlation devices 11 to 1M multiplying same spread codes as M kinds of spread codes used by a transmitter side as modulation information with a received signal individually wait for the reception signal at all times, and the signals inversely spread by the correlation devices 11 to 1M are subject to weight processing to enhance the communication quality at corresponding rake reception circuits 21 to 2M and the processed signals are respectively distributed into two, the one is fed to a spread code changeover detector 3 and the other is fed to a temporary storage circuit 4, in which the signal is sequentially stored. The spread code changeover detector 3 detects a switching state of the spread codes used for the modulation information based on output signals from the rake reception circuits 21 to 2M and selects an output signal of one rake reception circuit from the temporary storage circuit 4 based on the detection result and provides an output of the selected signal to a demodulation circuit 5.</p> |
