Discrete cosine transform Type-IV-based multicarrier modulators in frequency offset channels

Carrier frequency offset (CFO) is one of the main drawbacks of multicarrier modulation based on the discrete Fourier transform (DFT). To solve the above problem, several researchers have proposed the use of discrete trigonometric transforms. In this paper, we analyze the intercarrier interference and the bit-error probability in discrete cosine transform type-IV even (DCT4e)-based multicarrier systems under the presence of carrier frequency offset (CFO). The parameters which are involved in the design are established, and the expressions for both prefix and suffix to be appended into each data symbol to be transmitted are shown. Several computer simulations indicate that the proposed systems outperform the standardized ones based on the discrete Fourier transform (DFT) under the presence of CFO.