| 摘要 |
PURPOSE:To provide the automobile/portable telephone communication system capable of reducing the manufacture cost of a transmission part. CONSTITUTION:Concerning the automobile/portable telephone communication system for performing multiple access by a code division multiple access system at respective carrier frequencies while using plural carrier frequencies 2, transmission band width 4 of a transmitting signal is set wider than a frequency interval 3 between the adjacent carrier frequencies. The transmission band limitation of a transmitting signal is relaxed, characteristics required for a band limit filter are lowered or the band limit filter is unnecessitated. The use of a C class amplifier is permitted to a power amplifier. Leaked power to the adjacent carrier frequency band is generated by relaxing the transmission band limitation of the transmitting signal but the effect of leaked power is made little by the reverse spread on the reception side, and no trouble is generated in the hearing of received sound. |
