请教：Beamforming和Adaptive Beamforming区别？

关于Adaptive Beamforming的定义好像是这么给的：
Adaptive Beamforming is a technique in which an array of antennas is exploited
to achieve maximum reception in a specified direction by estimating the signal
arrival from a desired direction (in the presence of noise) while signals of
the same frequency from other directions are rejected.
这个本质上就是个spatial filter嘛，那么Beamforming和Adaptive Beamforming区别在哪
里呢？有没有Non-Adaptive Beamforming呢？

实际上的beamforming就是指adaptive beamforming。在后者出现之前很少见到beamforming这个词。

非要从字面上理解的话，adaptive beamforming 相对的应该是fixed beamforming,即前者是根据一定参数的变化而改变beamforming的系数。后者既传统的beamforming，其beamforming系数设计在馈电网络中。