[2] Soman, Anetha Nakkeeran, R John, Shinu. Comb Type Pilot Based Channel Estimation using Dft Based Interpolation for Spatial Modulated OFDM Systems[J]. International Journal of Engineering and Advanced Technology,2021,10(5):403-410.

[3] J. Zheng, H. Lv. Peak-to-average power ratio reduction in ofdm index modulation through convex programming[J].IEEE Communications Letters, 2017,21(7):1505-1508.

[4] Avci B, Aykiri G, Sava scihabe,et al. A novel asymmetrically clipped optical orthogonal frequency division multiplexing system based on lifting wavelet transform for visible light communications[J]. International Jouranl of Communication System, 2022, 35(6): e5082.

[5] A. Güner, A. ?zen. Lifting Wavelet Transform Based Multicarrier Modulation Scheme for Coherent Optical Communication Systems [ J]. Journal of Lightwave Technology,2021, 39(13): 4255-4261.

[9] Q. Ma, P. Yang, Y. Xiao, et al. Error probability analysis of OFDM-IM with carrier frequency offset[J]. IEEE Communications Letters, 2016,20(12):2434-2437.

[13] M. Maras, E. N. Ayvaz, M. G?me?, A. Sava?cihabe? and A. ?zen. A novel GFDM waveform design based on cascaded WHT-LWT transform for the beyond 5G wireless communications[J]. Sensors, 2021,21(5):1-19.

[14] Bouhlel, A. Sakly, S. Ikki. DWT based OFDM with index modulation for performance enhancement in the presence of CFO[J]. Journal of Theoretical and Applied Information Technology, 2017,95:1156-1161.

[15] Y.I. Tek, E. B. Tuna, A. Sava?cihabe? and A. ?zen. A new PAPR and BER enhancement technique based on lifting wavelet transform and selected mapping method for the next generation waveforms[J]. International Journal of Electronics and Communications, 2021,138(8):1-14.