Title :
Performance evaluation of 16-QAM signalling through nonlinear channels in an AWGN and interference environment: a simulation approach
Author :
Dimakis, C.E. ; Kouris, S.S. ; Kosmopoulos, S.A.
Author_Institution :
Dept. of Commun., Aristotle Univ. of Thessaloniki, Greece
Abstract :
The effects of nonlinear distortion on the error performance of a 16-QAM signalling scheme, operating in a typical satellite channel, are investigated by means of a computer simulation program. Additive white Gaussian noise is present on both input and output of the TWT amplifier. The results obtained are in good agreement with those obtained theoretically in other works, and show that the noise presence on the up-link causes severe system performance degradation. Moreover, the behaviour of a nonlinear system in the presence of up-link cochannel interference is examined. The results clearly show that the symbol error probability depends strongly on the symbol timing difference between the desired and the interfering signal, as well as on the phase difference of their carriers especially for low signal to interference ratios.<>
Keywords :
amplitude modulation; digital radio systems; digital simulation; error statistics; interference (signal); satellite links; telecommunication channels; telecommunications computing; white noise; 16-QAM signalling; AWGN; TWT amplifier; additive white Gaussian noise; cochannel interference; computer simulation program; error performance; interference environment; nonlinear channels; nonlinear distortion; performance degradation; phase difference; satellite channel; simulation approach; symbol error probability; symbol timing difference;
Journal_Title :
Communications, Speech and Vision, IEE Proceedings I
