陈大爽,李英善,吴虹.F-OFDM系统中的自适应EM相位噪声抑制算法[J].计算机科学,2019,46(2):68-75
F-OFDM系统中的自适应EM相位噪声抑制算法
Self-adaptive EM Phase Noise Suppression Algorithm in F-OFDM System
投稿时间:2018-04-09  修订日期:2018-05-01
DOI:
中文关键词:  滤波正交频分复用,子带共同相位误差,子带载波间干扰,最大期望,自适应
英文关键词:Filtered orthogonal frequency-division multiplexing,Sub-band common phase error,Sub-band inter-carrier interference,Expectation maximization,Self-adaptation
基金项目:本文受国家自然科学基金项目(61571244),天津市科技支撑重点项目(16YFZCSF00540)资助
作者单位E-mail
陈大爽 南开大学信号处理与传感网络实验室 天津300351  
李英善 南开大学信号处理与传感网络实验室 天津300351 yingsl1122@nankai.edu.cn 
吴虹 天津市光电传感器与传感网络技术重点实验室 天津300351  
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中文摘要:
      滤波正交频分复用技术(Filtered Orthogonal Frequency Division Multiplexing,F OFDM)是针对下一代移动通信的新技术,它在保持4G OFDM技术强抗干扰能力等诸多优点的基础上,能够适应未来各种灵活的业务配置;但其对相位噪声更加敏感,相噪会导致其出现子带共同相位误差(Sub Band Common Phase Error,SCPE)和子带载波间干扰(Sub Band Inter Carrier Interference,SICI),严重降低系统性能。基于最大期望准则(EM),提出一种自适应EM相噪抑制算法(AEM PNS),其中包含EM SCPE和EM SICI两个子算法,算法通过在符号帧中插入的相噪指示符(Phase Noise Instruction Symbol,PNIS)和导频指示符(Pilot Instruction Symbol,PIS)自动选择子算法。仿真结果表明,新提出的算法能自适应跟踪相噪的变化,有效降低相位噪声的影响,同时具有较低的计算复杂度和较高的频谱效率。
英文摘要:
      Filtered orthogonal frequency-division multiplexing (F-OFDM) is a new technology for next generation mobile communication system.F-OFDM can maintain the advantages such as strong anti-interference ability in OFDM system,and is adaptive for different flexible service configuration in the future.However,it’s more sensitive to phase noise than OFDM,which will cause sub-band common phase error (SCPE) and sub-band inter-carrier interference (SICI),thus seriously decreasing the performance of the system.This paper proposed a self-adaptive EM phase noise suppression algorithm (AEM-PNS) to reduce the phase noise in F-OFDM.It includes two sub-algorithms:EM-SCPE and EM-SICI.AEM-PNS can choose suitable phase noise suppression sub-algorithm automatically according to the inserted phase noise instruction symbol (PNIS) and pilot instruction symbol (PIS) in symbol frame.Simulation results show that the proposed algorithm can track phase noise adaptively,reduce the influence caused by phase noise effectively,and keep low complexity and high spectral efficiency simultaneously.
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