| 摘要: |
| 滤波器组多载波（FBMC）是第五代蜂窝网络无线接入技术重点考虑的对象之一，然而其存在较高的峰均功率比（PAPR）。通过分析FBMC-OQAM信号的重叠特性和信号功率分布特点，将传统选择性映射（SLM）方法加以改进，提出了一种比色散选择性映射（DSLM）方法更优的低复杂度色散选择性映射（LD-SLM）方法。LD-SLM方法用备选旋转矢量将当前数据块信号旋转，通过计算在当前信号周期\[T,3T\]区间内信号的PAPR来选取最优旋转矢量，并更新当前数据块信号，接着对下一个数据块信号进行同样的优化，直至所有的数据块都被优化。通过比较算法复杂度可知,LD-SLM算法相比DSLM算法降低了50〖WT《Times New Roman》〗%〖WTBZ〗，仿真实验表明LD-SLM方法能有效降低FBMC-OQAM系统的PAPR。 |
| 关键词: FBMC-OQAM系统；峰均功率比降低；选择性映射 低复杂度算法 |
| DOI：10.3969/j.issn.1001-893x.2017.09.014 |
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| 基金项目: |
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| A low-complexity selective mapping algorithm for PAPR reduction in FBMC-OQAM systems |
| WU Jianxia,YANG Yongli,PAN Chang |
| (School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 430081,China) |
| Abstract: |
| Filter-bank multi-carrier(FBMC) is one of the key objects of the fifth generation cellular network(5G) radio access technology. However,there is also a high peak-to-average power ratio(PAPR). Through analyzing the overlapping characteristics and signal power distribution characteristics of FBMC-OQAM signal,the selective mapping(SLM) method of reducing PAPR in OFDM system is improved,and a Low-complexity Dispersion Selective Mapping(LD-SLM) method is proposed,which is better than the Dispersive Selective Mapping(DSLM) method. The LD-SLM method rotates the current data block signal with the alternative rotation vector,and selects the optimal rotation vector by calculating the PAPR of the signal in the current signal period \[T,3T\],and updates the current data block signal. The data block signals are similarly optimized until all data blocks are optimized. By comparing the algorithm complexity,it is concluded that the LD-SLM algorithm is 50〖WT《Times New Roman》〗%〖WTBZ〗 lower than the DSLM algorithm. The simulation results show that the LD-SLM method can effectively reduce the PAPR of the FBMC-OQAM system. |
| Key words: FBMC-OQAM system peak-to-average power ratio(PAPR) reduction selective mapping low-complexity algorithm |
