一种基于预留子载波的 CA-FBMC 系统 PAPR 抑制算法

针对引入载波聚合的滤波器组多载波（carrier aggregation-filter bank multicarrier，CA-FBMC）调制系统峰均功率比（peak to average power ratio，PAPR）进一步升高的问题，基于预留子载波（tone reservation，TR）思想，提出一种适用于面向载波聚合的FBMC（filter bank multicarrier）系统降低PAPR的有效方法，利用分量载波间原有保护子载波充当预留子载波成分，结合时域信号剪切的处理方法，在不改变原有信号子载波有效输入数据的前提下，降低系统信号的PAPR。同时，由于重叠因子的存在，为克服系统符号重叠特性的影响，利用后向迭代的处理思想，对时域输出信号进行分组，针对每组信号分别进行迭代剪切处理，并将处理完成的信号进行后向叠加处理，从而避免符号重叠引发的峰值增生而导致PAPR回退的问题。仿真结果表明，该算法可在不影响系统基本传输性能的情况下有效降低系统的PAPR。

An effective method of reducing PAPR in FBMC system with carrier aggregation

In order to solve the much high PAPR(peak to average power ratio) problem in FBMC(filter bank multicarrier)system with carrier aggregation, this paper presents an improved method based on tone reservation (TR) to reduce PAPR in this system. Rather than applying the valid data subcarriers traditionally, we take the guard band ( GB) subcarriers between component carriers (CC) in carrier aggregation utilized as the reserved subcarriers, which are filled with redundant data to reduce PAPR. To minimize the impact of overlapping factor, backward superimposition process between symbols is also used in this method against the regrowth of PAPR caused by the overlapping structure of symbols, which means that the signal is divided into different groups and each group completed will be added to next one for processing. Simulation results show that this method presented effectively improves the PAPR performance without affecting the basic transmission performance.