超宽带毫米波MIMO-OFDM系统的非线性频偏自干扰与信道联合估计方法  

Nonlinear Frequency Offset Self-Interference and Channel Joint Estimation Method in UWB Millimeter Wave MIMO-OFDM Systems

作　　者：孙启禄[1] 张博[1] 李涛泳 SUN Qilu;ZHANG Bo;LI Taoyong(Information and Navigation School,Air Force Engineering University,Xi’an 710077,China)

机构地区：[1]空军工程大学信息与导航学院,西安710077

出　　处：《空军工程大学学报》2024年第6期96-103,共8页Journal of Air Force Engineering University

基　　金：陕西省自然科学基础研究计划(2023-JC-QN-0674)。

摘　　要：系统同步产生的载波频偏会导致超宽带毫米波多输入输出(MIMO)正交频分复用(OFDM)系统产生非线性频偏自干扰,影响后续信道估计性能。为此,提出了一种非线性频偏自干扰与信道联合估计方法,通过挖掘数据超维隐藏空间的方式,将复杂的多目标优化问题降维分解成多个可并行求解的子优化问题,并利用超宽带毫米波信道的稀疏特性,采用压缩感知算法实现载波频偏与信道的迭代估计。与现有的联合估计方法相比,仿真结果表明所提方法能够有效降低计算复杂度,提升了系统信道估计准确度,并降低了系统误码率。In performance,carrier frequency offset generated by the system synchronization can cause not only nonlinear frequency offset self-interference in the ultra-wideband millimeter-wave multi-input multi-output(MIMO)orthogonal frequency division multiplexing(OFDM)system,but also influence of subsequent channel estimation performance.For this reason,this paper proposes a method for joint estimation of nonlinear frequency offset self-interference and channel,by exploiting the hyper-dimensional hidden space of data,reducing the complex multi-objective optimization problem into multiple parallel solvable sub-optimization problems,and using the sparse characteristics of ultra-wideband millimeter wave channels to realize iterative estimation of carrier frequency offset and channel based on compressive sensing.Compared with the existing methods,the simulation results show that the proposed method can effectively reduce the computational complexity by nearly one order of magnitude,improve the accuracy of channel estimation,and reduce the system bit error rate.

关 键 词：超宽带毫米波 MIMO-OFDM 非线性频偏自干扰 信道估计 

分 类 号：TN911.72[电子电信—通信与信息系统]