Adaptive modulation methods for combating Doppler shift on correlated double ring channel using FBMC

In mobile-to-mobile wireless communication, the Correlated Double Ring (CDR) channel model, crucial for signal quality, exhibits multipath fading due to scatterers, affecting the bit error rate (BER) through Doppler effect and fading. We employed the Filter Bank Multicarrier- Offset Quadrature Amplitude Modulation (FBMC-OQAM) technique to mitigate these effects. The study integrated FBMC-OQAM with 4-QAM, 16-QAM and 64-QAM modulation schemes, tested at three different transmission and reception speeds. Simulations with signal to noise ratios from 0 dB to 10 dB showed a proportional drop in BER to SNR. The 4-QAM modulation resulted in a significantly lower average BER compared to 16-QAM and 64-QAM. Adaptive modulation yielded better BER values than 64-QAM but not as effective as 4-QAM or 16-QAM. The proposed method using FBMC-OQAM with three modulations effectively counters Doppler shift in the CDR channel. © 2024 Inderscience Enterprises Ltd.