estimation variance meaning in Chinese

估计方差

The differences on resolution capability and the performance of estimation between beam - space processing and element - space processing are analyzed . transforming matrices are designed for the consideration of depressing the resolution threshold and estimation variance
分析比较了波束域处理与阵元域处理的分辨能力以及估计性能，并从降低分辨门限和估计方差角度考虑，给出了转换矩阵的构造方法。
Tricepstrum equalization algorithm ( btea ) and super - exponential ( se ) algorithm based on block data estimation is studied , and these algorithms use hos explicitly . their performance , such as estimation variance and bias , is analyzed . a kind of sparse cross cumulant and sparse equalizer is proposed to simplify the se algorithm , and the simulating results show efficient reduction in complication
?研究了几种直接使用高阶统计量的算法，包括基于数据段估计的倒三谱算法和超指数算法，分析了算法的估计方差和偏差等性能；由于超指数算法计算量较大，不利于实时均衡，利用水声信道的稀疏性，提出了一种基于稀疏互四阶累积量和稀疏权的算法，有效降低了超指数算法的计算量。