Ofdm-Im Performance Analysis in Presence of Doppler Frequency Shift

This paper investigates the performance degradation of the OFDM-IM system caused by transceiver movement, which leads to Inter-Carrier Interference (ICI) due to the Doppler frequency shift. OFDM-IM uses indices to carry additional information, creating OFDM subblocks, which increases spectral efficiency compared to conventional OFDM. However, subblock orthogonality becomes vulnerable to frequency shifts in high mobility. The approximate BER expression of Dual Doppler frequency shifts is derived over the Nakagami fading channel. The results show that the system performance is impaired by the Doppler effect, as illustrated by the simulation.