基于脉冲成型的OFDM系统峰均比抑制  

PAPR Suppression of OFDM System Based on Pulse Shaping

作　　者：牛明 

机构地区：[1]北京圣非凡电子系统技术开发有限公司,北京100039

出　　处：《自动化技术与应用》2016年第3期42-46,共5页Techniques of Automation and Applications

摘　　要：作为经典的多载波传输技术,OFDM信号由多路并行信号叠加而成,当多路信号以相同的相位进行叠加时就会产生较大的峰值平均功率比(Peak To Average Power Ratio,PAPR)。较高的PAPR要求系统具有线性度较大的高功率放大器和复杂度较高的A/D、D/A转换器,否则将直接导致带内失真和带外辐射,使系统的性能下降。为了降低OFDM信号的PAPR,人们提出了大量的方案,例如限幅滤波、部分传输序列、分组编码和脉冲整形等。本文提出采用改进的奈奎斯特脉冲整形技术可以在有效降低OFDM信号的PAPR的同时不增加系统的复杂度,是一种非常简单而有效的解决方案。As one of the multicarrier transmission method, the OFDM signal superposes by the parallel subcarrier signals. When the multipath signals superpose with the same phase, the OFDM system produces high Peak to Average Power Ratio（PAPR）, which requests system to have high linearity power amplifier and high complexity ADC, DAC, otherwise, highly PAPR will cause the in-band distortion and out-of-band radiation, lowers the performance of the system. In order to reduce the PAPR of OFDM signal, a large number of solutions are suggested, such as limiting filtering, partial transmit sequence, group coding and pulse shaping. This paper adopts the improved Nyquist pulse shaping method it can effectively reduce the PAPR of OFDM signals and at the same time can guarantee that not increases the complexity of the system.

关 键 词：正交频分复用 峰均功率比 奈奎斯特脉冲成型 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]