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Multi-stage and Variable-length Peak Windowing Techniques for PAPR Reduction of OFDMA Downlink Systems  

Lee, Sung-Eun (Yonsei University)
Min, Hyun-Kee (Yonsei University)
Bang, Keuk-Joon (Induk Institute of Technology)
Hong, Dae-Sik (Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.2, 2008 , pp. 67-74 More about this Journal
Abstract
This paper proposes two peak-windowing algorithms for peak-to-average power reduction(PAPR) of orthogonal frequency division multiple access(OFDMA) downlink systems. The Proposed algorithms mitigate the effect of excessive suppression due to successive peaks or relatively high peaks of the signal. First, multi-stage peak windowing algorithm is proposed, which exploits multiple threshold of target PAPR in order to step down the peaks gradually. Secondary, variable-length peak windowing algorithm is proposed, which adapts the window length with respect to the existence of successive peaks within a half of window length. Therefore, the proposed method reduces the distortion of signal amplitude caused by window overlapping. The proposed algorithms outperform the conventional peak windowing with the aid of window-length adaptation or sequential peak power reduction. Simulation results show the efficiency of the proposed algorithms over OFDMA downlink systems, especially WiBro systems.
Keywords
OFDMA; WiBro; PAPR; Peak Windowing;
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