一种基于DFT扩频与幅值归一化变换联合技术的降低Polar-OFDM系统峰均比的方法  

DFT-spread combined with amplitude normalization method to reduce the PAPR in Polar-OFDM system

作　　者：唐琪[1] 李坤颖 刘星明[1] 孔令晶[1] TANG Qi;LI Kunying;LIU Xingming;KONG Lingjing(School of Shenzhen institute information Technology,Shenzhen 518172,China)

机构地区：[1]深圳信息职业技术学院计算机学院

出　　处：《电视技术》2019年第9期1-5,17,共6页Video Engineering

基　　金：深圳市科技计划项目(JCYJ20170306095622684);深圳信息职业技术学院校培育计划(QN201706)

摘　　要：为降低单极性Polar-OFDM(P-OFDM)系统的高功率峰均比(PAPR),提出了一种基于DFT扩频和归一化变换联合技术的P-OFDM方法。根据针对P-OFDM信号的特性分析,对经过星座映射之后的信号进行DFT变换,经过间隔插零与扩频技术之后进行IFFT,生成双极性的时域复信号,再对坐标变换之后的幅值进行归一化变换,生成实正基带P-OFDM信号。通过仿真系统分析得出,基于DFT扩频与归一化变换联合技术的P-OFDM系统,相比于传统P-OFDM系统,能有效降低信号PAPR约4.5 dB,同时,性能与传统P-OFDM系统性能一致,且系统硬件实现较为简单,是一种有效降低P-OFDM系统PAPR的方法。In this paper,a new method combining discrete Fourier transform-spread(DFT-Spread)and amplitude normalization(AN),which is named DFT-Spread-AN,is proposed to reduce the PAPR in Polar-OFDM system.Theoretical analysis is presented on the Polar-OFDM signal based on the DFT-Spread-AN scheme.Simulation results show that the proposed DFT-Spread-AN-P-OFDM scheme achieves the reduction of P-OFDM signal PAPR effectively.Compared with the convention P-OFDM system,the PAPR of the proposed method is reduced by about 4.5 dB.Moreover,the system performance is the same as the convention P-OFDM system.Meanwhile,its hardware implementation is also simple,which is improved to be a kind method to reduce the PAPR in Polar-OFDM system.

关 键 词：Polar-OFDM DFT扩频技术 归一化变换 PAPR 

分 类 号：TN929.5[电子电信—通信与信息系统]