Joint low‐complexity equalisation and CFO compensation for DCT–OFDM communication systems based on SIC

In wireless radio communication systems, equalisation is one of the most important algorithms to improve the bit-error-rate performance. The linear zero-forcing equalisers suffer from noise enhancement. The linear minimum mean square error equalisers suffer from large complexity and require the estimation of the signal-to-noise ratio to work properly. In this study, the authors propose a joint low-complexity regularised zero-forcing equaliser with successive interference cancellation (JLRZF–SIC) based on discrete cosine transform (DCT) for orthogonal frequency division multiplexing (OFDM) systems. The proposed JLRZF–SIC scheme jointly performs the equalisation and carrier frequency offset (CFO) compensation with lower-complexity using the banded-matrix approximation concept. Simulation results show the important role of the proposed JLRZF–SIC scheme is to improve the system performance compared to the other equalisation schemes.