| 摘要 |
PURPOSE:To reduce the power consumption of a transmitter and to control the transmission power against the fluctuation of a reception level by decreasing a bias voltage of an amplifier normally and increasing a bias voltage of the amplifier at fading only. CONSTITUTION:When a reception level detection section at a receiver side detects a level reduction, the section sends control information to an interface circuit 51 of a sender side. A bias voltage control circuit 52 changes slowly a bias voltage of an amplifier from a steady-state value to a value at a high output by using control information received by the circuit 51. Moreover, upon the receipt of information representing the decrease in the reception level, an input level control circuit 54 changes the input level of the amplifier at a speed not causing a code error to increase the transmission power. furthermore, a distortion generating quantity control circuit 53 controls the distortion compensation circuit simultaneously. Thus, the power consumption is reduced without causing a code error to control the transmission power. |
