PAPR Reduction for OFDM System using DCT Based Modified PTS Technique

Abstract: Though the OFDM provides high data rate due to its high spectral efficiency, it has high PAPR which results in performance degradation and high out of band radiation due to nonlinearity of the high power amplifier. Partial Transmit sequence is one of the distortions-less PAPR reduction techniques which obtain the minimum PAPR signal by multiplying suitable phase factors with subsequenced subcarriers. In order to reduce PAPR even more, autocorrelation among data should be less. So DCT is applied along with PTS technique which has the property of reduction of autocorrelation. In the proposed method DCT is applied before PTS technique and after the PTS technique. The simulation results show that DCT preceding PTS technique has better performance compared to DCT succeeding PTS technique. The analysis of the both the proposed method is carried out with different subcarriers and sub-blocks are discussed REFERENCES [1] Yiyan Wu and William Y. Zou, “ Orthogonal Frequency Division Multiplexing: A Multi-Carrier Modulation Scheme,” IEEE Transactions on Consumer Electronics, vol. 41, no. 3, pp. 392-399, August 1995. [2] S. B. Weinstein and Paul M. Ebert, “ Data Transmission by Frequency Division Multiplexing using the Discrete Fourier Transform,” IEEE Transactions on Communication Technology, vol. 19, no. 5, pp. 628-634, October 1971. [3] Tao Jiang and Yiyan Wu, “ An Overview: Peak to Average Power Ratio Reduction Techniques for OFDM Signals,” IEEE Transactions on Broadcasting, vol. 54, no. 2, pp. 257- 268, June 2008. [4] Xiaodong Li and Leonard J. Cimini, “Effects of Clipping and Filtering on the Performance of OFDM,” IEEE Communications Letters, vol. 2, no. 5, pp. 131-133, May 1998. [5] William Y. Zou and Yiyan Wu, “ COFDM: An Overview,” IEEE Transactions on Broadcasting, vol. 41, no. 1, pp 1-8, March 1995 [6] Jones A. E. , Wilkinson T. A. and Barton S. K., “Block Coding Scheme for Reduction of peak to mean envelope power ratio of multicarrier transmission scheme,” vol. 30, issue 25, pp. 2098- 2099, August 2002. [7] R.W. Bauml, R.F.H. Fischer and J.B. HuberJ. Wang, “Reducing the Peak-toAverage Power Ratio of Multicarrier Modulation by Selected Mapping,” IEEE Electronic Letters, vol. 32, no. 22, pp. 2056-2057, October 1996. [8] 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, pp. 368-369, February 1997. [9] Parneet Kaur, Ravinder Singh, “Complementary Cumulative Distribution Function for Performance Analysis of OFDM Signals”, IOSR Journal of Electronics and Communication Engineering (IOSRJECE),