An Efficient Low Complexity Transform for DCT-OFDM Based Wireless Communication System
A precise method for the performance of a new DCT based OFDM system using a low complexity T-transform that combines the WHT and the DCT into a single fast orthonormal unitary transform (T-DCT) on AWGN and Rayleigh fading channels is proposed. The T-transform is developed through the sparse matrices factorization using tensor product scheme. Several signaling formats such as quadrature phase shift keying and 16-ary quadrature amplitude modulation are considered. Theoretical analysis of the T-transform for DCT based OFDM is presented in this work. Analysis and simulation results demonstrated that the proposed OFDM system achieves lower PAPR and the better BER over AWGN and Rayleigh fading channels. Compared to T-DFT of OFDM, T-DCT of OFDM is found to have lower PAPR and better BER therefore, T-DCT OFDM system outperforms the T-DFT OFDM on AWGN and Rayleigh fading environments. Simulation results are used to examine and compare the PAPR and the BER performance of T-DCT OFDM system and T-DFT OFDM system. Numerical results show that the T-DCT OFDM system outperforms the T-DFT OFDM system on AWGN and Rayleigh channel models.
dct ofdm t-transform wht papr dft