| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress the increase of the number of components, the expansion of a circuit scale, the extension of an area and the increase of power consumption by simplifying a circuit configuration of a transmitting and receiving system for simultaneously transmitting and receiving system signals of a plurality of radio systems. <P>SOLUTION: This radio communication apparatus comprises: local oscillators 120b and 120c provided corresponding to radio systems 100A, 100B and 100C to generate local oscillation signals obtained by shifting a center frequency of the radio systems 100B and 100C only by a predetermined frequency; demodulators 119b and 119c for obtaining a baseband signal of each radio system by respectively multiplying a received signal by the respective local oscillation signals; and AD converters 122a the number of which is smaller than the number of the respective radio systems to perform the analog-digital conversion of a baseband signal of a radio system demodulated by using the local oscillation signal obtained by shifting the center frequency by diverting a circuit for performing the analog-digital conversion of a baseband signal of the radio system 100A whose band is wider than that of the radio system. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
