1
$\begingroup$

I have a linear 4 element antenna array currently in my design, I am able to obtain the I/Q data from each antenna. Now I am trying to implement the MUSIC algorithm to obtain the AoA (Angle of Arrival). I have read some articles about the algorithm, however, I did not come across any article that explains how theory can be implemented in practice. I have few question hope some one will support me.

  1. Are there any tutorials or articles that describes the MUSIC algorithm implementation detail? I prefer in C/C++ language. But any other language is also ok.

  2. In the derivation of the MUSIC algorithm, normally it assumes N number of sources. Is this the number of actual sources or does it also counts multipath signals?

  3. Are there any articles describing MUSIC algorithm implementation once we have the I/Q data?

Thanks a lot!!

$\endgroup$
1
$\begingroup$

I'm going to group number 1 and 3 as related.

  1. For a high level description of MUSIC, you can take a look at MATLAB's overview here. One of the main steps in the algorithm is to find the eigenvectors of a correlation matrix, which can be done via singular value decomposition or other methods. MATLAB has functions for this, so you may want to find equivalent functions in C/C++, or implement your own. The other steps in the algorithm are more implementation agnostic: mostly data collection and simple vector operations.

  2. Using an N-element array, MUSIC can resolve at most N - 1 sources. These can be real sources or their images and must be dealt with accordingly.

For some more specific implementation details, I have an answer here where we go through the process of collecting data and performing MUSIC in MATLAB.

| improve this answer | |
$\endgroup$
  • $\begingroup$ Hi Envidia, Many thanks for the reply. In a real scenario, even though I know the actual number of sources, with the multi path effects there can be multiple signals incoming to each antenna. In this case how should I handle it? $\endgroup$ – radar101 Aug 31 at 4:56
  • 1
    $\begingroup$ @radar101 There are a few ways. The most simple, but still effective, is to discard returns that have calculated angles from areas outside your zone of interest or from directions that are "impossible", for example a return originating from the ground when you're trying to find an airborne target. In more hostile environments like jamming, this is more difficult and must employ more advanced techniques. $\endgroup$ – Envidia Aug 31 at 5:32
  • $\begingroup$ Hi Envidia, Thanks for the reply. My design will be used in indoor for tracking purpose. In this case are there any recommended algorithm do you recommend so that I can read about them? Also for MUSIC, is 4 antennas are sufficient? $\endgroup$ – radar101 Aug 31 at 6:24
  • 1
    $\begingroup$ @radar101 I don't have any specific algorithms that I could openly give. If you have good SNR, 4 antennas should not be a problem as long as they are designed well. $\endgroup$ – Envidia Aug 31 at 16:12
  • 1
    $\begingroup$ Thanks for the information $\endgroup$ – radar101 Aug 31 at 17:22

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.