Dear Milton Kumar Kundu

You need the channel sate information to select the best path to the signal from the source to destination if you have have have multiple relays. One thing, I could not understand is that how can you determine channel sate for the eavesdroppers?

Would you guess their locations.

Best wishes

Dear Dr. Abdelhalim abdelnaby Zekry

I hope, you are having a good day. Thank you very much for your informative answer.

I know it is almost impossible to achieve a perfect CSI of an eavesdropper. So, I am not concern about the ways to achieve the CSI of the eavesdropper. Rather I am interested in the fact that is it absolutely necessary to have the CSI of an eavesdropper to apply the best relay selection scheme?

Thanks in advance.

Dear @

Same for you!

I have a question that may help us to answer your question.

Why do you want to know the channel sate information for an eaves dropper?

Only in the case that you want to nullify its recieved signal or make it less than his receiver sensitivity, you have to know its channel sate information.

Then the problem will be similar to that of the space multiplexing MIMO.

What I mean it depends on how do you want to prevent the eaves

dropping.

Best wishes