WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 11, 2012
Reduced Complexity Max Norm Based PAPR Optimization in OFDM Systems
Authors: ,
Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is a suitable multicarrier modulation scheme for high speed broadband communication systems. OFDM provides bandwidth efficiency and robustness against multipath fading channels, but is sensitive to nonlinear effects due to the high Peak-to-Average Power Ratio (PAPR) of the transmitted signal. The reduction in PAPR is desirable in order to obtain power efficiency and to increase BER performance. This paper proposes an efficient Reduced Complexity Max Norm (RCMN) algorithm for optimizing the PAPR of the OFDM signals. The proposed technique avoids the use of additional Inverse Fast-Fourier Transform (IFFT) as compared to Selective Level Mapping (SLM) and Partial Transmit Sequence (PTS) and hence reduces the computational and phase search complexity. In addition, as compared to other probabilistic schemes such as SLM and PTS, the proposed scheme does not require the transmission of Side Information (SI) to the receiver, which provides better bandwidth utilization. The proposed scheme has been compared with SLM and PTS schemes and the results show that the RCMN improves PAPR optimization with less computational and phase search complexity.