THE ERROR PERFORMANCE SIMULATION FOR DEQPSK SYSTEMS EMPLOYING NONLINEAR PHASE SYNCHRONIZERS

摘要

In this paper, we use the importance sampling (IS) method to evaluate the bit error rate (BER) for systems employing nonlinear synchronizers. It is shown by simulation results that the sample sizes required by the IS method for evaluating the BER of systems with nonlinear synchronizers are almost constant for various values of signal-to-noise ratio (SNR). This implies that the efficiency of IS to MC method approaches infinity as the SNR becomes very high. It is also shown in this paper that for differential decoding of QPSK signals, the error performance of a system with nonlinear synchronizer of size 15 is close to that of a coherent system.