Peak-to-Average Power Ratio Reduction Techniques for OFDM Signals

Abstract

Orthogonal frequency division multiplexing (OFDM) has been adopted as a standard for many modern wireless applications requiring high data rate due to bandwidth efficiency, resistance to frequency selective fading and simple digital realization using IFFT/FFT operations. However, physical implementation of the OFDM system suffers from several difficulties. One of the major limitations of OFDM is that it suffers from high peak-to-average power ratio (PAPR), which results in inter-carrier interference (ICI), high out-ofband radiation, and degradation of bit error rate performance. In this paper, different OFDM PAPR reduction techniques are reviewed and analyzed based on their computational complexity, bandwidth requirement and error performance.

PAPR reduction in OFDM system with Wavelet transformation and partial transmit sequence technique

“…Some PAPR reduction methods have been proposed, such as clipping and iltering, SLM, etc. Generally, the reduction methods can be divided into three categories: distortion method, such as clipping and iltering; distortion less or probabilistic method, such as Partial Transmit Sequence (PTS) and Selective Mapping; and coding method such as Golay complementary sequences [1]. The simplest PAPR reduction technique and easiest to implement in OFDM systems is Clipping and Filtering [2], but the technique decreases the bit error rate (BER).…”

“…The simulation results in [3] showed that the PTS technique achieved better PAPR mitigation when comparing with the SLM method in OFDM system. All the PAPR reduction methods described in [1] deal with Discrete Fourier Transform (DFT)-based OFDM. Another variant of OFDM, called discrete wavelet transform (DWT)-based OFDM, was studied in [4][5][6].…”