Flexible companding design for PAPR reduction in OFDM and FBMC systems

In this paper, we propose a nonlinear companding technique called “trapezoidal power companding” to reduce the high peak-to-average power ratio (PAPR) in a complex OFDM or FBMC system by transforming the original signals into new signals whose power is trapezoidally distributed. A flexible parameter is used to determine the shape of the trapezium so that the proposed scheme is able to meet the requirements for various conditions. Given an expected PAPR value, the scheme provides a closed-form solution that guarantees the actual PAPR the same as the expected. Simulation results show that the proposed scheme offers a trade-off in terms of the complementary cumulative distribution function (CCDF) of PAPR, out-of-band radiation and bit error rate (BER). A comparison with another flexible companding scheme in [12] shows that our proposed scheme has better BER performance and has a perfect theoretical prediction of the actual PAPR values.

[1]  J. Huber,et al.  OFDM with reduced peak-to-average power ratio by optimum combination of partial transmit sequences , 1997 .

[2]  Behrouz Farhang-Boroujeny,et al.  Cosine Modulated and Offset QAM Filter Bank Multicarrier Techniques: A Continuous-Time Prospect , 2010, EURASIP J. Adv. Signal Process..

[3]  Tao Jiang,et al.  Exponential companding technique for PAPR reduction in OFDM systems , 2005, IEEE Trans. Broadcast..

[4]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[5]  Yoan Shin,et al.  A Robust Companding Scheme against Nonlinear Distortion of High Power Amplifiers in OFDM Systems , 2008, VTC Spring 2008 - IEEE Vehicular Technology Conference.

[6]  Josef A. Nossek,et al.  Comparison of Filter Bank Based Multicarrier Systems with OFDM , 2006, APCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems.

[7]  R. Bäuml,et al.  Reducing the peak-to-average power ratio of multicarrier modulation by selected mapping , 1996 .

[8]  V. Vijayarangan.  AN OVERVIEW OF TECHNIQUES FOR REDUCING PEAK TO AVERAGE POWER RATIO AND ITS SELECTION CRITERIA FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING RADIO SYSTEMS , 2009 .

[9]  Pradip Sircar,et al.  Modified Exponential Companding for PAPR Reduction of OFDM Signals , 2007, 2007 IEEE Wireless Communications and Networking Conference.

[10]  Jianhua Ge,et al.  Peak-to-Average Power Ratio Reduction of OFDM Signals With Nonlinear Companding Scheme , 2010, IEEE Transactions on Broadcasting.

[11]  Xianbin Wang,et al.  Reduction of peak-to-average power ratio of OFDM system using a companding technique , 1999, IEEE Trans. Broadcast..

[12]  Behrouz Farhang-Boroujeny,et al.  OFDM Versus Filter Bank Multicarrier , 2011, IEEE Signal Processing Magazine.

[13]  Ashraf A. Eltholth,et al.  Modeling the Effect of Clipping and Power Amplifier NonLinearities on OFDM Systems , 2007 .

[14]  Jia-Ming Chen,et al.  Efficient PAPR Reduction in OFDM Systems Based on a Companding Technique With Trapezium Distribution , 2011, IEEE Transactions on Broadcasting.

[15]  Tapio Saramäki,et al.  A Generalized Window Approach for Designing Transmultiplexers , 2008, IEEE Transactions on Circuits and Systems I: Regular Papers.