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OFDM和DMT多载波传输系统固有的高峰均功率比(PAPR)能导致功率传输效率的严重退化,特别是用电池作为电源的终端更为严重。目前文献中最常用的PAPR减少技术是选择性映射(SLM)序列技术,它已经达到能把PAPR减少几dB的程度。尽管SLM技术对减少PAPR表现得不错,但是实际上,每个OFDM数据串进行传输的时候,它都需要进行多次的IFFT(快速傅里叶变换)运算,这就增加了的系统的复杂性。因此SLM方法有较长的计算时间和较高的功率消耗。建议了一种低复杂度的前置IFFT的PAPR减少方法,它在PAPR减少方面能比SLM方法做得更好,与此同时它的计算复杂度比SLM有较大的减小。
The intrinsic peak-to-average power ratio (PAPR) of OFDM and DMT multi-carrier transmission systems can result in severe degradation of power transmission efficiency, especially with batteries as the power source terminals. The PAPR reduction technique most commonly used in the literature is the Selective Mapping (SLM) sequence technique, which has reached the point where PAPR can be reduced by a few dB. Although SLM technology performs well for reducing PAPR performance, in practice it requires multiple IFFT operations per OFDM data string for transmission, which adds to the complexity of the system . Therefore, the SLM method has a longer calculation time and higher power consumption. A PAPR reduction method for low complexity pre-IFFT is proposed, which can make better PAPR reduction than the SLM method, and at the same time its computational complexity is much lower than that of SLM.