The precoding scheme based on real Hadamard transform is an effective and flexible way for reducing the peak-to-average power ratio (PAPR) of OFDM signals. However, the reduction capacity of PAPR is limited for real Hadamard transform method. In this paper, the new scheme based on complex Hadamard transform is proposed. The simulation results indicate that the proposed scheme may obtain a 1.2 dB PAPR reduction of OFDM signal with only moderate complexity compared with the real Hadamard transform.
A. Zolghadrasli and M. H. Ghamat, “An Overview of PAPR Reduction Techniques for Multicarrier Transimission and Propose of New Techniques for PAPR reduction,” Iranian Journal of Electrical and Computer Engineering, Vol. 7, No. 2, 2008, pp. 115-120.
S. H. Muller and J. B. Huber, “OFDM with Reduced Peak to Average Power Ratio by Optimum Combination of Partial Transmit Sequences,” IEEE Electronics Letters, Vol. 33, No. 5, 1997, pp. 368-369.
R. W. Bauml, R F. Fischer and J. B. Huber, “Reducing the Peak-to-Average Power Ration of Multicarrier Modulation by Selected Mapping,” Electronics Letters, Vol. 32, No. 22, 1996, pp. 2056-2057. doi:10.1049/el:19961384
A. Aung, B. P. Ng and S. Rahardja, “Sequency-Ordered Complex Hadamard Transform: Properties, Computational Complexity and Applications,” IEEE Transactions on Signal Processing, Vol. 56, No. 8, 2008, pp. 3562-3571.