| 摘要 |
According to a method, a first signal is produced from a digital input signal by pre-emphasis and said signal is supplied, after carrier frequency translation, D/A conversion and modulation, to a power amplifier for producing a carrier-frequency output signal. IN order to linearize the characteristic curve of the power amplifier, pre-emphasis is carried out in a manner controlled by parameters. A test signal is superposed to the first signal, thereby producing an output signal having a carrier-frequency test signal portion in addition to a carrier-frequency input signal portion. A comparison of the carrier-frequency test signal portion of the output signal with the test signal yields the parameter for controlling pre-emphasis. Alternatively, the test signal can be superposed before the pre-emphasis to be carried out.
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