小波包变换对CO-OFDM系统高峰均比的抑制性能研究

童峥嵘; 郭尊礼; 曹晔; 张卫华

doi:doi:10.3788/gzxb20154412.1206001

光子学报, 2015, 44 (12): 1206001, 网络出版: 2015-12-23

小波包变换对CO-OFDM系统高峰均比的抑制性能研究

Wavelet Packet Transform for PAPR Reduction Performance in CO-OFDM System

论文大纲

童峥嵘 ^*郭尊礼曹晔张卫华

作者单位

天津理工大学薄膜电子与通信器件重点实验室, 天津 300384

正交频分复用相干检测小波包变换误码率频谱利用率 Orthogonal frequency division multiple Wavelet transforms Coherent detection Bit error rate Spectrum utilization

摘要

针对相干光正交频分复用系统中出现的高峰值平均功率比问题, 提出用小波包变换取代传统快速傅里叶变换的相干光正交频分复用系统.仿真实验证明了具有良好正交性的小波包变换对高峰值平均功率比起到一定程度上的抑制作用, 且误码率性能优于传统的快速傅里叶变换.随着小波尺度函数及小波函数对称性的提升, 其避免信号处理过程中的相移的能力提高, 系统性能有所改善.与传统的快速傅里叶变换系统相比, 基于小波包变换的系统中, 小波基函数haar小波的互补累计分布函数为0.01时, 门限值降低约2 dB, 且在误码率为10-3的情况下, 性能优化1.5 dB.在此基础上, 将小波提升算法应用到相干光正交频分复用系统中, 得到的抑制峰均比及误码率性能与应用Mallat算法时一致, 但算法的结构复杂度降低.

Abstract

Due to the high peak to average power ratio in coherent optical orthogonal frequency division multiplexing system, a coherent optical orthogonal frequency division multiplexing system using the wavelet packet transform instead of the traditional fast Fourier transform was proposed. Simulation results show that the novel transformation has obvious inhibiting effect on peak to average power ratioand and gets better bit error rate performance than the traditional system using fast Fourier transform. With symmetry of the wavelet scaling function and wavelet function improving, the ability to avoid the phase shift improves in the process of signal processing and system performance ameliorates.At the complementary cumulative distribution function of 0.01, peak to average power ratio of using haar wavelet function can be optimized 2 dB and the optical signal to noise tatio of haar is improved by 1.5 dB at bit erro rate of 10-3 compared with that of traditional fast Fourier transform. On the basis of research, with the simpler algorithm structure, lifting wavelet transform instead of Mallat algorithm was proposed to apply to the coherent optical orthogonal frequency division multiplexing system system and the inhibition peak to average power ratio and bit erro rate performance is similar to the latter system.

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童峥嵘, 郭尊礼, 曹晔, 张卫华. 小波包变换对CO-OFDM系统高峰均比的抑制性能研究[J]. 光子学报, 2015, 44(12): 1206001. TONG Zheng-rong, GUO Zun-li, CAO Ye, ZHANG Wei-hua. Wavelet Packet Transform for PAPR Reduction Performance in CO-OFDM System[J]. ACTA PHOTONICA SINICA, 2015, 44(12): 1206001.

小波包变换对CO-OFDM系统高峰均比的抑制性能研究

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