Combined DCT and Companding for PAPR Reduction in OFDM Signals
- 1
Abstract
The high peak-to-average (PAPR) is one of the serious problems in the application of OFDM technology. The com-panding transform approach is a very attractive technique to reduce PAPR, but large PAPR reduction leads to a high bit error rate (BER) by the available companding transform techniques. In this paper, a joint reduction in PAPR of the OFDM signals based on combining the discrete cosine transform (DCT) with companding is proposed. In the first step of the proposed scheme, the data are transformed by a DCT into new modified data. In the second step, the proposed scheme utilizes the companding technique to further reduce the PAPR of the OFDM signal. The performance of the PAPR is evaluated using a computer simulation. The simulation results indicate that the proposed scheme may obtain about 1 dB PAPR reduction compared with the conventional companding algorithm.
- T. Jiang and Y. Imai, “An Overview: Peak-To-Average Power Ratio Reduction Techniques for OFDM Signals,” IEEE Transactions on Broadcasting, Vol. 54, No. 2, 2008, pp. 257- 268. doi:10.1109/TBC.2008.915770
- S. H. Han and J. H. Lee, “An Overview of Peak-to-Average Power Ratio Reduction Techniques for Multicarrier Transmission,” IEEE Transaction on Wireless Communication, April 2005, pp. 56-65.
- I. Sohn, “RBF Neural Network Based SLM Peak-to- Average Power Ratio Reduction in OFDM Systems,” ETRI Journal, Vol. 29, No. 3, 2007, pp. 402-404. doi:10.4218/etrij.07.0206.0155
- X. B. Wang, “Reduction of Peak-to-Average Power Ratio of OFDM System Using a Companding Technique,” IEEE Transaction on Broadcasting, Vol. 45, No. 3, 1999, pp. 303-307. doi:10.1109/11.796272
- X. Huang, J. H. Lu, J. L. Zhen, et al., “Companding Transform for Reduction in Peak-to-Average Power of OFDM Signals,” IEEE Transactions on Wireless Communications, Vol. 3, No. 6, 2004, pp. 2030-2039. doi:10.1109/TWC.2004.837619
- M. Park, J. Heeyong, N. Cho, D. Hong and C. Kang, “PAPR Reduction in OFDM Transmission Using Hadamard Transform,” IEEE International Conference on Communications, Vol. 1, Jun 2000, pp. 430-433.
- J. Kim and Y. Shin, “An Effective Clipping Companding Scheme for PAPR Reduction of OFDM Signal,” IEEE International Conference on Communications 2008, Beijing, 2008, pp. 668-672.
- X. D. Zhu, G. X. Zhu and T. Jiang, “Reducing the Peak-to- Average Power Ratio Using Unitary Matrix Transformation,” IET Communications, Vol. 3, No. 2, 2009, pp.161-171. doi:10.1049/iet-com:20080194
- C. Tellambura, “Upper Bound on Peak Factor of N- Multiple Carriers,” Electronics Letter, Vol. 36, No. 14, 2000, pp. 1226-1228.
- W. J. Yuan, P. W. Hao and C. Xu, “Matrix Factorization for Fast DCT algorithms,” IEEE International Conference on Acoustics, Speech and Signal Processing, 2006, pp. 948-951.