| 摘要 |
PROBLEM TO BE SOLVED: To attain phase adjustment independently of precision and deviation in a phase shift means by controlling a phase of a recovered carrier so that a phase of a recovered carrier signal through inverse spread processing and a phase of a carrier signal extracted from a reception signal are in phase to each other. SOLUTION: An IF(intermediate frequency) signal 12 of a received multiplex signal is inversely spread by an inverse spread demodulator 13 based on an inverse spread signal PN0 and a recovered carrier component is given to a phase shifter 19 via a BPF 16 and an amplifier 18 and its output is fed to a base band demodulator 28. On the other hand, an IF carrier signal 23 is extracted from the reception IF signal 12 via a multiplexer 20 and a frequency divider 22 and a phase detector 24 is used to detect a phase difference with the phase of the recovered carrier 25. The phase difference is converted into a DC voltage by an LPF 26 and the phase shifter 19 is controlled so as to make the phase difference zero. Thus, the phase adjustment due to the precision or deviation of the phase shifter or dispersion in a narrow band filter is not required. |
