Papr reduction in OFDM & MC-CDMA system using nonlinear companding techniques

High peak to average power ratio (PAPR) of the transmitted signal is a major drawback of OFDM and MC-CDMA systems. In this paper various existing nonlinear companding transforms are analyzed and compared for the reduction of peak to average power ratio in OFDM and MC-CDMA systems. Nonlinear companding transforms transform the amplitude or power of the original signals into uniform distribution, which can effectively reduce the PAPR for different modulation formats and subcarrier sizes without any complexity increase and bandwidth expansion. Nonlinear companding technique adjust both large and small signals and can keep the average power at the same level. Nonlinear companding transforms can significantly improve the performance of OFDM and MC-CDMA system including bit-error-rate and PAPR reduction.

[1]  T. Wilkinson,et al.  Block coding scheme for reduction of peak to mean envelope power ratio of multicarrier transmission schemes , 1994 .

[2]  Jeong Goo Kim,et al.  A novel subblock partition scheme for partial transmit sequence OFDM , 1999, IEEE Trans. Broadcast..

[3]  Stefan H. Müller-Weinfurtner.  Optimum Nyquist windowing in OFDM receivers , 2001, IEEE Trans. Commun..

[4]  Tao Jiang,et al.  On the Nonlinear Companding Transform for Reduction in PAPR of MCM Signals , 2007, IEEE Transactions on Wireless Communications.

[5]  Lin Yang,et al.  MC-CDMA Specific PAPR Reduction Technique Utilising Spreading Code Redistribution , 2006, IEEE Vehicular Technology Conference.

[6]  Young-Hwan You,et al.  A simple construction of OFDM-CDMA signals with low peak-to-average power ratio , 2003, IEEE Trans. Broadcast..

[7]  Jae Hong Lee,et al.  Modified selected mapping technique for PAPR reduction of coded OFDM signal , 2004, IEEE Transactions on Broadcasting.

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

[9]  Yiyan Wu,et al.  Orthogonal frequency division multiplexing: a multi-carrier modulation scheme , 1995 .

[10]  S. H. Muller-Weinfurtner.  Optimum Nyquist windowing in OFDM receivers , 2001 .

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

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

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

[14]  A. S. Madhukumar,et al.  Peak-to-average power reduction using partial transmit sequences: a suboptimal approach based on dual layered phase sequencing , 2003, IEEE Trans. Broadcast..