MIMO-OFDM信号参数盲估计方法

为解决非协作通信中多输入多输出-正交频分复用(MIMO-OFDM)信号的参数盲估计问题,提出基于循环自相关结合四阶循环累积量的多参数估计方法。求MIMO-OFDM信号的自相关函数,对其傅里叶变换后得到循环自相关函数,通过对循环自相关三维图不同切面的分析估计出符号周期、有用符号时间、循环前缀时间;求MIMO-OFDM信号的四阶循环累积量,通过检测峰值的数目及其对应的循环频率估计出子载波数及子载波频率。仿真结果表明,在较低信噪比下,所提算法可准确估计出MIMO-OFDM信号的多个参数。

Blind estimation method of MIMO-OFDM signal parameters

To solve the problem of blind parameter estimation for multi-input multi-output-orthogonal frequency division multiplexing(MIMO-OFDM)signals in non-cooperative communication,a multi-parameter estimation method based on cyclic autocorrelation and fourth-order cyclic cumulants was proposed.The autocorrelation function of MIMO-OFDM signal was obtained,and the cyclic autocorrelation function was obtained after Fourier transform.The symbol period,useful symbol time and cyclic prefix time were estimated by analyzing the different sections of the cyclic autocorrelation three-dimensional graph.The fourth-order cyclic cumulants of MIMO-OFDM signals were calculated.The number of subcarriers and subcarrier frequencies were estimated through the number of detected peaks and their corresponding cyclic frequencies.The simulation results show that the proposed algorithms can accurately estimate multiple parameters of MIMO-OFDM signals at low SNR.