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MMWCAS-RF-EVM: Array phase interpolation methods

brickporter
Intellectual 305 points
Part Number: MMWCAS-RF-EVM
Other Parts Discussed in Thread: TIDEP-01012

Hi specialists:

   In the reference design TIDEP-01012, the MIMO mode uses 9Tx antennae to form the virtual array shown as follows

It can be observed that there are some holes in the virtual array. In the SDK doc, it is mentioned that some phase interpolation method can be applied to lower the side lobe level. 

Could you provide information (papers/references/...) about the interpolation methods.

Thanks.

Regards,

Stan  

  • 0
    TI__Guru*** 141284 points

    Hi,

    Please give us some time to check with systems team

    thank you

    Cesar

  • +1 in reply to Cesar
    TI__Guru*** 141284 points

    Hi,

    Here is the answer from systems team

    The holes in the azimuth dimension of the virtual array can be avoided by using all the azimuth direction TX channels on the cascade board.

    However, if a TX sequence is used that results in holes in the virtual array then there are several methods to mitigate the artifacts.

     

    The simplistic way is to Insert Zeros at the hole locations in the virtual array. This will result in the correct angle estimation however the side-lobe levels will still be higher.

    More sophisticated methods have been developed and actively being researched. TI does not have any recommendation for any particular method or algorithm. The users can look into existing literature dealing with “sparse arrays” or “array interpolation”. One example of such a paper is “Swingler, D.N. and R.S. Walker, Line-array beamforming using linear prediction for aperture interpolation and extrapolation. IEEE Transactions on Acoustics, Speech, and Signal Processing, 1989. 37(1): p. 16-30.”

    Thank you

    Cesar

  • 0 in reply to Cesar
    Intellectual 305 points

    Hi Cesar:

    Thank you for quick reply.

    It helps me a lot.

    Stan

  • 0 in reply to brickporter
    TI__Guru*** 141284 points

    Thank you

    Cesar