估计

The algorithm uses observation window in order to reduce the frequency offset error, in which average of every frequency offset estimation values of three symbols is obtained during frequency offset estimation.

改进的算法对连续三个符号进行ML估计，在进行频偏估计时，通过使用观察窗，在窗口内对频偏估计值进行均值运算，对频偏估计值误差进行矫正。

In the neural network based method, a semi-blind channel estimation technique based on extreme learning machine for MIMO-OFDM systems is proposed.

在神经网络估计方法中，本文提出了一种基于极限学习机的半盲信道估计方法，在该算法中，极限学习机被作为一个信道估计器来估计信道的冲激响应。

And it presents an estimation method for frequency difference by means of data synchronization selecting the time window of AFC frequency difference estimation hi order to solve the problem that data symbol transition induces an enormous error of frequency difference estimation.

针对AFC频差估计中数据突变引起频差估计较大误差的问题，提出了利用数据符号同步对AFC频差估计时间窗口选择的AFC频差估计方法。