Abstract

In this paper, the performance of QAM (quadrature amplitude modulation) systems using adaptive transversal filters with additional decision-feedback (DF) taps, in the presence of Gaussian noise and one FDM-FM interfering signals, is analysed. On the basis of an approximate statistical model of an FDM-FM signal, the analytic expressions and curves of symbol error probability of QAM systems with and without adaptive filters, are obtained. The performance improvement achieved by adopting adaptive filters is clearly evident. Simulation results also display the effectiveness of adaptive DF filters for suppressing FM interference in QAM systems. >

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