Abstract
AbstractIn digital microwave communication, the signal power is first amplified and then transmitted. However, power amplifiers have, in general, nonlinear characteristics. If such an amplifier is used in a linearly modulated tranmission system, the signal is subjected to nonlinear distortion. This makes analysis of the channel extremely difficult. If the number of levels in the transmission channel is few, the method of simulation can be applied for analysis. If the number of levels is large, the calculation becomes unwieldy. In this paper a simple analytical method to compute the intersymbol interference distribution and error probability of the output signal for a nonlinear transmission channel consisting of an amplifier with assumed cubic approximation for the input‐output characteristics, a transmitter filter and a receiver filter. This simplicity, derived from the fact that small intersymbol interference can be regarded as Gaussian noise in the aggregate, becomes the theoretical base. Also, the validity of the method is shown in comparing the error probability of the 4‐ary PSK system computed from the proposed method with that obtained by the simulation method.
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