SOCP Approach for OFDM Peak-to-Average Power Ratio Reduction in the Signal Adding Context

Orthogonal frequency division multiplexing (OFDM) is an attractive technique for wireless communications applications. However, one of the main disadvantages of OFDM is its high peak to average power ratio (PAPR) that limits transmitter power efficiency. Without any measures, the OFDM signal is limited by the power amplifier (in the transmitter) what causes interference both on the signal itself and in adjacent frequency bands. In this paper we formulate the reduction of the PAPR problem as a second order cone programming problem (convex optimization). We extend two known methods by choosing unused carriers in standards to minimize PAPR. The results are presented for the 802.11a standard. The proposed method induces no in-band distortion and stay compatible towards the IEEE 802.11a spectrum masking. Moreover, they don't need any side information and can be applied for real or complex OFDM baseband

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

[2]  Chin-Liang Wang,et al.  A low-complexity peak-to-average power ratio reduction technique for OFDM-based systems , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[3]  James A. Davis,et al.  Peak-to-mean power control in OFDM, Golay complementary sequences and Reed-Muller codes , 1998, Proceedings. 1998 IEEE International Symposium on Information Theory (Cat. No.98CH36252).

[4]  S. Weinstein,et al.  Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform , 1971 .

[5]  Xiaodong Li,et al.  Effects of clipping and filtering on the performance of OFDM , 1998, IEEE Communications Letters.

[6]  C. Tellambura,et al.  Reducing the peak-to-average power ratio of orthogonal frequency division multiplexing signal through bit or symbol interleaving , 2000 .

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

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

[9]  Douglas L. Jones,et al.  An active-set approach for OFDM PAR reduction via tone reservation , 2004, IEEE Transactions on Signal Processing.

[10]  Alok Aggarwal,et al.  Minimizing the peak-to-average power ratio of OFDM signals via convex optimization , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[11]  Babak Hossein Khalaj,et al.  On the peak-to-average power of OFDM signals based on oversampling , 2003, IEEE Trans. Commun..

[12]  A convex interior-point method for optimal OFDM PAR reduction , 2005, IEEE International Conference on Communications, 2005. ICC 2005. 2005.