计算机科学 ›› 2019, Vol. 46 ›› Issue (2): 68-75.doi: 10.11896/j.issn.1002-137X.2019.02.011
所属专题: 网络通信
陈大爽1, 李英善1, 吴虹2
CHEN Da-shuang1, LI Ying-shan1, WU Hong2
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。
中图分类号:
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