| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a circuit for applying linear compensation to nonlinear distortion caused in a transmission system and to increase the improved amount of the distortion. SOLUTION: A transmission feedback circuit is provided with an IF filter 112 and a base band filter 114, and the filter 112 is provided with switches to select a filter BPF having an attenuation characteristic with respect to an adjacent channel band in the case of reception or a filter LPF having a passing characteristic with respect to the band in the case of transmission. Furthermore, the radio equipment is provided with a low pass filter having an attenuation characteristic with respect to a next adjacent channel band between a nonlinear distortion compensation section and an orthogonal modulation section and means which switch plural high frequency changeover switches in the case of connecting to an externally mount transmission power booster, input characteristic data of the booster power amplifier to the nonlinear distortion compensation section, vary a gain of a transmission feedback circuit, apply digital orthogonal modulation to I, Q base band digital modulation signals to be sent. |
