Title :
Interference effect on the performance of PSK and QAM systems
Author_Institution :
Center for Studies in Telecommun., Pontificia Univ. Catolica do Rio de Janeiro, Brazil
Abstract :
Performance degradation results for typical phase shift keyed (PSK) and quadrature amplitude modulation (QAM) systems distributed by several types of interfering signals are presented. The set of interfering signals includes digital carriers with the same modulation as the desired ones and also unmodulated carriers. The error probability was calculated using moments and the Gauss quadrature rule. Curves relating carrier-to-interference and carrier-to-noise ratios were then plotted for co-channel and adjacent channel interferences. Although most of the calculation techniques used are not new, the present numerical results are useful for establishing interference criteria for digital transmission systems.<>
Keywords :
amplitude modulation; digital communication systems; interference (signal); phase shift keying; Gauss quadrature rule; PSK; QAM; adjacent channel interferences; carrier to interference ratio; carrier to noise ratio; cochannel interference; digital carriers; digital transmission systems; error probability; interfering signals; modulated carriers; phase shift keyed; quadrature amplitude modulation; systems performance; unmodulated carriers;
Journal_Title :
Communications, Speech and Vision, IEE Proceedings I
