| 摘要 |
For determining the operating point of a non-linear amplifier 2 of a communication channel 1, for example of a transponder in a communication satellite, a first input signal I1 is transmitted through the communication channel 1 at a power level PI1 which drives the non-linear amplifier 2 in a non-linear operation mode. In addition, a second input signal i2 is transmitted through the communication channel 1 simultaneously with the first input signal I1. The second input signal i2 is transmitted at a level below the level of the first input signal I1. If the contribution of the second input signal i2 to the total input of the non-linear amplifier is small, the operating point of the non-linear amplifier is determined almost only by the first input signal. Therefore, the output power Po2 corresponding to the second signal i2 is determined most strongly by the input power PI1 of the first signal I1. The operating point (PI,PO) of said non-linear amplifier (2) is determined on the basis of an output signal (o2) of said communication channel (1) corresponding to said second signal (i2). <IMAGE> |
