An Analysis for the Performance of the OFDM-IM Systems Impaired by Carrier Frequency Offset

For the last years, a great deal of interest has been paid to OFDM systems with index modulation (OFDM-IM) because of its energy efficiency and flexibility in the spectral domain. However, these systems suffer from carrier frequency offset that degrades the system performance. In a recent paper, an attempt was made to evaluate the performance in terms of bit error rate (BER) when the received signal is disturbed by an additive white Gaussian noise and a carrier frequency offset (CFO). Nevertheless, the approximations made in the existing analysis resulted in inaccurate simulation results. In this paper, the approximations we consider seem to be well-suited since the closed form expression of the BER is now consistent with the simulations results based on a maximum-likelihood detector.