Estimation technique of low crest factor signal in multiple signal representation

OFDM system has attracted much attention as a fourth mobile communication due to its high bandwidth efficiency and robustness to frequency-selective fading channel. However, one disadvantage of OFDM signal is its high crest factor that results in nonlinear distortion at the high power amplifier (HPA). Therefore, various methods have been proposed for reducing crest factor. Among them, selective mapping (SLM) has been considered a good technique for crest factor reduction. However, it requires numerous inverse fast Fourier transform (IFFT) operations, which show the high computational complexity. In this paper, we proposed a low crest factor estimation technique without IFFT operation. It is inserted prior to IFFT block and estimates the low crest factor sequence using a correlation approach. The computer simulation shows that the estimation technique reduces the computational complexity while it has almost the same crest factor performance as that of the conventional SLM.