| 摘要 |
Co-channel interference of a frequency modulated signal represented by compl ex signal samples is reduced by amplitude limiting each sample and non-linearly filtering the limited samples. The non-linear filter low pass filters the limited samples, multiplies the filtered samples by their complex conjugates, and high pass filters the prod ucts to produce resultant signal samples. It also squares the filtered samples, low pass fil ters the squared samples, multiplies the filtered squared signals by the complex conjugates o f the filtered samples, combines the result with said resultant signal samples and the filt ered samples, and low pass filters the combined signal to produce samples having reduced c o-channel interference. The limiter and non-linear filter can be constituted by a digi tal signal processor.
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