0
$\begingroup$

I have a basic question about maximum likelihood (ML) estimator and its implementation with power allocation.

Suppose we are using $MIMO$ system with $4$x$4$ transmit and receive antennas, so the received signal which includes the signal + noise + ISI can be written :

$y = HX + n$

$H,X, n $ are the channel, transmitted signal and noise, respectively. suppose that only first antennas is active and other antennas are not active, so the transmitted signal will be as below: enter image description here

My question is about the possibility to use power allocation to detect the active antenna, which means the estimated signal will be as:

enter image description here

I am asking if we can detect the active antenna in that way, is that possible ? Is there another method we can use instead of that ? Is there any document explain that ?

Thank you.

$\endgroup$
  • $\begingroup$ Have a look into spatial modulation. $\endgroup$ – BlackMath Apr 12 at 11:50
  • $\begingroup$ @BlackMath Yes it's the same of Spatial modulation, but I think even if using this algorithm with SM, it can't be used. (as mentioned in below answer) $\endgroup$ – New_student Apr 12 at 12:00
1
$\begingroup$

What you mention could be right in low modulation order, such as QAM but in 16-QAM and 32-QAM, the amplitude is changed also, I mean you will have different amplitude levels, so you can't implement that detector.

$\endgroup$
  • $\begingroup$ Yes, I got it. thank you $\endgroup$ – New_student Apr 12 at 12:00

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.