I am doing some research about millimeter wave massive MIMO channel now. We first take account about static MIMO channel, cause we only have SISO measurement system now. We use scanner to move our antenna to simulate it as array antenna to measure the static channel. Afterwards, using signal processing method to simulate static MIMO channel. There are some paper that doing the similar research, they analysis the coherence bandwidth at different antenna element. But I can't realize what the purpose of studying that issue. Is that related to some other MIMO techniques?
As far as I know, coherence bandwidth is corresponding to multi-path delay spread, and is an indicator to distinguish whether the channel is flat-fading or not.
It shows that multi-path would cause difference phase shift owing to the steering array. However, I can't realize what the model is associated with coherence bandwidth at each element.
Can someone please help me or provide some idea. Thanks in advance
reference ： R. W. Heath, N. González-Prelcic, S. Rangan, W. Roh and A. M. Sayeed, "An Overview of Signal Processing Techniques for Millimeter Wave MIMO Systems," in IEEE Journal of Selected Topics in Signal Processing, vol. 10, no. 3, pp. 436-453, April 2016.