Performance Analysis of DM-OFDM Systems Under Hardware Impairments and Various Channel Conditions

Authors : Miraç Muncuk, İbrahim Develi, Mahmut Yıldırım, Büşra Karahan

Pages : 111-119

Doi:10.46387/bjesr.1659441

View : 56 | Download : 37

Publication Date : 2025-04-30

Article Type : Research Paper

Abstract :This study investigates the performance of Dual-mode index modulation aided orthogonal frequency division multiplexing (DM-OFDM) systems under hardware impairments and varying channel conditions. The spectral efficiency provided by dual-mode operation is analyzed in comparison to conventional index modulation OFDM (OFDM-IM) over Rayleigh and Rician fading channels. Practical hardware impairments, such as phase noise and IQ imbalance, are incorporated into the model to evaluate their effects. Simulations conducted for different subcarrier numbers (N=64/128/256) and active subcarrier configurations (K=1/2/3) demonstrate that DM-OFDM outperforms conventional OFDM-IM in terms of bit error rate (BER) performance under both channel conditions. In high signal to noise ratio (SNR) regions, an error floor caused by hardware distortions is observed, emphasizing the need to consider this effect in system design. While increasing the number of subcarriers and optimizing active subcarrier selection enhances performance, the line-of-sight component in the Rician channel further improves the system\\\'s performance.
Keywords : OFDM, İndis Modülasyonu, Donanım Kusurları, Bit Hata Oranı

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