SC-FDMA系统基于限幅技术降低峰均比的研究

PAPR reduction in SC-FDMA system by clipping technique

SC-FDMA是LTE上行链路的多址接入方案。SC-FDMA中的集中式频分多址(LFDMA)峰均比相对较高。分别通过硬限幅、软限幅和平滑限幅的方法,降低LFDMA的峰均比,并针对这三种方法的PAPR性能,抗噪声性能和带外辐射问题进行分析比较。仿真结果表明,在允许的带外辐射和抗噪声性能情况下,限幅法是一种简单、易于实现且能有效降低发送信号峰均比的方法。

SC-FDMA is the Hplink multiple access scheme in LTE. Localized FDMA which is a special case of SCFDMA signal has relatively high PAPR. PAPR of LFDMA signal is reduced by means of hard limiting, soft limiting and smooth limiting respectively. Analysis and comparisons of the PAPR, anti-band noise performance and out-of- band emission based on these three methods was made. The simulation results show that in the acceptable situation of bit error rate and out-of-band emission, clipping is a simple, easy approach which can effectively reduce the PAPR of SC-FDMA signal.