| 摘要 |
An arrangement to analyze the nonlinear properties of a communication channel that uses a test signal having a number of tones. The test signal is transmitted via the communication channel to be evaluated. For the individual tones of the test signal, equidistant tone frequencies are selected, some of these tone frequencies not being used for the test signal. By the use of frequency shifters in the form of digital modulators, which shift the frequency spectrum of the transmitted test signal to zero by in each case one tone frequency value that is not used, nonlinear interference can be determined with the aid of a low-pass filter.
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