| 摘要 |
PURPOSE:To avoid the synthesis amplitude caused in a carrier phase difference from being zero in steady-state when a mobile station is stopped and receives plural carriers and to prevent the deterioration in the reception quality by varying the phase of the carrier at each transmission by a prescribed phase when a same signal is sent for many number of times. CONSTITUTION:In the case of transmission for n-times, suppose that the signal structure of a digital signal inputted to modulators 23, 24 is the same and the phase of the digital signal inputted to the modulators 23, 24 is synchronized. The modulation signal is mixed in terms of frequencies with a signal from local oscillators 25, 26 at mixers 27, 28 and synthesizers whose phase is variable are used for the local oscillators 25, 26. In this case, when the phase of the local oscillators 25, 26 is sent repetitively for n-times, the phase is varied by Kpi/n,-Kpi/n (K=0, 1,...n). Thus, when plural transmission waves are received when the mobile station 21 is stopped, the state of the synthesized amplitude being zero in steady-state due to the carrier phase difference is avoided and the deterioration in the reception quality is prevented. |
