Title :
Suppression of FM interference in QAM systems using adaptive decision-feedback filters
Author :
Libing, Wu ; Guangguo, Bi ; Boxiu, Wu
Author_Institution :
Dept. of Radio Eng., Southeast Univ., Nanjing, China
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
Keywords :
adaptive filters; amplitude modulation; digital filters; digital radio systems; error statistics; feedback; frequency modulation; interference suppression; radiofrequency interference; FDM-FM interfering signals; FM interference; Gaussian noise; QAM systems; adaptive decision-feedback filters; approximate statistical model; performance analysis; quadrature amplitude modulation; symbol error probability; transversal filters; Adaptive filters; Adaptive systems; Displays; Error probability; Gaussian noise; Interference suppression; Performance analysis; Quadrature amplitude modulation; Signal analysis; Transversal filters;
Conference_Titel :
Circuits and Systems, 1991. Conference Proceedings, China., 1991 International Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CICCAS.1991.184308
