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研究了MIMO OFDM系统中最小描述长度(MDL)准则在均方根时延扩展估计中的应用.分析了多径分量功率和多径分量的自相关矩阵之间的关系,使MDL可有效地应用于RDS估计.该估计器能以较低的计算复杂度给出RDS、噪声方差、信道功率和信噪比等多个实时信道参数的准确估计.根据估计的多径分量功率,利用MDL准则获得了当前信道环境下的路径数及它们各自时延的估计;根据路径数得到了噪声方差和各径功率的估计,从而得到当前信道的功率时延谱和均方根时延扩展的估计.仿真结果表明该估计器可有效对抗信道中信噪比变化和频率选择性的影响.
The application of minimum description length (MDL) criterion in MIMO OFDM system to rms delay estimation is studied.The relationship between multipath component power and autocorrelation matrix of multipath components is analyzed, so that MDL can be effectively applied Which is estimated by RDS. The estimator can accurately estimate multiple real-time channel parameters, such as RDS, noise variance, channel power and signal-to-noise ratio with low computational complexity.According to the estimated multipath component power, According to the number of paths, the estimation of noise variance and each path power is obtained, and the estimate of the power delay spectrum and the root mean square delay spread of the current channel is obtained. The results show that the estimator can effectively counter the change of signal-to-noise ratio and frequency selectivity in the channel.