一种降低FBMC-OQAM系统PAPR的算法  

Algorithm for Reducing PAPR of FBMC-OQAM System

作　　者：吴建霞[1] 杨永立[1] WU Jian-xia;YANG Yong-li;School of Information Science and Engineering;Wuhan University of Science and Technology;

机构地区：[1]武汉科技大学信息科学与工程学院,武汉430081

出　　处：《计算机科学》2018年第6期89-95,共7页Computer Science

摘　　要：滤波器组多载波(Filter Bank Multi-Carrier,FBMC)与偏移正交振幅调制(Offset Quadrature Amplitude Modulation,OQAM)相结合的FBMC-OQAM技术在无线通信系统中具有频谱效率高和无需同步等特点。然而,FBMC-OQAM系统较高的峰均功率比(Peak-to-Average Power Ratio,PAPR)容易导致信号失真、频谱扩展、系统性能下降。鉴于此,文中提出一种载波预留(Tone Reservation,TR)和μ-律压扩联合的新方法(TR-μLaw)来降低FBMCOQAM系统的PAPR。TR方法具有无失真特性,而μ-律压扩法虽然给FBMC-OQAM系统带来了一定失真,但是能显著降低PAPR。TR-μLaw方法将二者结合,实现了两种方法的利弊互补。仿真结果表明,TR-μLaw方法在降低PAPR方面的性能优于μ-律压扩法和TR方法,在μ=3和Iterations=8时TR-μLaw方法的PAPR较后两者分别降低约1.0dB和3.4dB,且BER性能优于μ-律压扩法。FBMC-OQAM technique combining filter bank multi-carrier（FBMC）and offset quadrature amplitude modulation（OQAM）shows the characteristics such as high spectrum efficiency and without synchronization in wireless communication system.However,the higher peak-to-average power ratio（PAPR）in FBMC-OQAM systems can easily lead to signal distortion,spectrum extension and system performance degradation.Therefore,this paper proposed a method to reduce the PAPR by applying a new expansion hybrid method for FBMC-OQAM systems.The new method called TR-μLaw combines Tone Reservation（TR）andμ-law companding scheme.The TR method has no distortion characteristic and theμ-law companding method causes the distortion to FBMC-OQAM system,but it has obvious effects of reducing PAPR.Therefore,TR-uLaw hybrid method realizes the complementary advantages of the two methods.The simulation results show that the performance of reducing PAPR is better than that of bothμ-law and TR methods which reduce about 1.0 dB and 3.4 dB atμ=3 and Iterations=8,respectively,and the BER performance of the TR-μLaw method is better than that ofμ-law method.

关 键 词：基于滤波器组的多载波通信系统 峰均功率比 载波预留 非线性压扩变换 联合法 

分 类 号：TN929.5[电子电信—通信与信息系统]