| 摘要 |
<p>PROBLEM TO BE SOLVED: To make shared devices one, to perform the nonlinear distortion compensation of a transmission part without increasing a circuit scale and to perform direct communication between mobile station in the radio equipment of digital linear modulation used in a system for performing communication between the mobile stations through a base station or the system for performing duplex or simplex communication. SOLUTION: The switch devices 112, 114 and 121 of a coaxial relay or the like are provided and the circuit of the output stage of a power amplifier 118 is switched at the time of transmission/reception frequency inversion. Then, without providing the two sets of the shared devices, feedback circuits and compensation circuits corresponding to transmission/reception frequency bands, a feedback/control loop for nonlinear compensation is constituted of one shared device 102 and one set of the feedback circuit 117 and the compensation circuit 139, radio waves for which nonlinear distortion generated in the power amplifier part 118 and the switch device 121 are compensated are sent out and the radio waves of the two frequency bands of transmission and reception are received.</p> |
