一种在LTE-Advanced载波聚合下降低CM的方法

A method to reduce CM for carrier aggregation in LTE-Advanced

3GPP LTE采用OFDMA作为物理层多址接入技术。而峰值引起的功率回退是OFDM技术的主要问题,因此在LTE中,采用CM(立方度量)来度量功率回退。LTE-Advanced中为了提升峰值速率引入了载波聚合技术,多个成员载波的引入可能会带来CM的提升。主要介绍一种载波聚合下降低由于重复导频引起的CM过高的方法。该方法不仅能够在多个成员载波情况下有效地降低CM,并且可以将复杂度和处理时延控制在较小范围内。

3GPP LTE uses OFDMA as the physical layer multiple access technology, the power fullback caused by peak power is the main problem in OFDM technology. In LTE, CM（cubic metric） is used to measure the probelm. LTE-Advanced used carrier aggregation to improve the peak throughout, which may rise CM by muhiple component carrier. This paper introduced a method to reduce CM for carrier aggregation caused by reused reference signal. This method can reduce the CM effectively in the case many component carriers are aggregated, and to control the complexity and processing delay in the smaller range.