| 摘要 |
PURPOSE:To reduce a repetitive zone number by using a same radio carrier so as to apply composite modulation to a telephone signal thereby sending/ receiving the resulting signal in the mobile body communication in which a time compressed signal is superimposed on a time slot of frame configuration. CONSTITUTION:A telephone signal is frequency-modulated by using one time slot of a radio channel allocated between a mobile radio equipment 100 and a radio base station 30 and the modulated signal is sent/received while the signal is amplitude-modulated again by using the same telephone signal. Since the carrier is frequency-modulated and then amplitude-modulated by using the same telephone signal, a large multiplex load gain is obtained and required transmission power is reduced, the interference to an adjacent radio zone is prevented in advance, the repetitive zone number is reduced to utilize the frequency effectively. |
