Simulated and semi-analytical throughput evaluation for AMC-OFDMA systems

In this paper, we propose an efficient semi-analytical throughput evaluation strategy for an orthogonal frequency division multiple access (OFDMA) system. We compare the performance of the simulated and semi-analytical throughput values in terms of average signal to noise ratio (SNR). In the investigated system, OFDMA is combined with adaptive modulation and coding (AMC) technique based on distinct modulation and coding schemes (MCSs). The semi-analytical throughput evaluation of the proposed strategy depends on the calculation of the introduced bit error rate (BER) and the corresponding spectral efficiency based on the utilized MCS levels across fading channels. The utilized BER calculation method considers the approximated exponential formula with respect to SNR values. The transmitter of the AMC-OFDMA system divides the OFDMA frame into sub-channels depending on the detected number of users at an assigned base station (BS). The simulation results show that the simulated and semi-analytical throughput plots of the AMC-OFDMA system are converging together particularly for high SNR levels.