Performance analysis of OFDM-IM scheme under STO and CFO

Suyoto Suyoto (Lembaga Ilmu Pengetahuan Indonesia (LIPI))
Agus Subekti (Lembaga Ilmu Pengetahuan Indonesia (LIPI))
Arief Suryadi Satyawan (Nurtanio University)
Vita Awalia Mardiana (Lembaga Ilmu Pengetahuan Indonesia (LIPI))
Nasrullah Armi (Lembaga Ilmu Pengetahuan Indonesia (LIPI))
Dayat Kurniawan (Lembaga Ilmu Pengetahuan Indonesia (LIPI))

International Journal of Electrical and Computer Engineering
Vol 11, No 4: August 2021

In this letter, performance analysis of orthogonal frequency division multiplexing with index modulation (OFDM-IM) is presented in term of bit error rate (BERs). The analysis considers its performance under two impairments, symbol time offset (STO) and carrier frequency offset (CFO) in frequency-selective fading channel. As orthogonal multicarrier system, OFDM-IM is subject to both inter-symbol interference (ISI) and inter-carrier interference (ICI) in a frequency-selective fading channel. OFDM-IM is a new multicarrier communication system, where the active subcarriers indices are used to carry additional bits of information. In general, in the previous existing works, OFDM-IM are evaluated only for near-ideal communication scenarios by only incorporating the CFO factor. In this work, the OFDM-IM performance is investigated and compared with conventional OFDM in the presence of two impairments, STO and CFO. Simulation results show that OFDM-IM outperforms the conventional OFDM with the presence of STO and CFO, especially at high SNR areas.