• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 516 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CCS/IWR6843ISK: how to compute the txPhaseShifter in the chirp configure file？

user4542591
Prodigy 240 points
Part Number: IWR6843ISK

Tool/software: Code Composer Studio

Hi，

tx beamforming with the iwr6843ISK experiment， we find the document 《Beamforming_in_LRPD》，

we don't know how the -15 degree and the txPhaseShifter value 8174592 correspond to each other ？

We made some attempts to compute the txPhaseShifter value 8174592， but we didn't get the result，

the 8174592 is divided into 4 parts，every part is a byte，they are in the picture


Tx0's phaseshifter is 0,

Tx1's phaseshifter is 10111100,

Tx2's phaseshifter is 1111100,

what degree the 10111100 and 1111100 stand for ？ 

we make a table as follow, is it right ?

many thanks !

  • 0
    TI__Mastermind 40495 points

    Hi, 

    please use this MATLAB script for phaseShifter generation.  We are in the effort to update that document to include this script.

    theta_desired = -15;

    m_ind = [0 1 2];   % antenna distance in unit of lambda  

    phaseInc = 5.625; % step size for the phase shifter

        

    phaseTX_rad = 2*pi*(m_ind*sind(theta_desired));

    phaseTX_deg = (phaseTX_rad)*180/pi;

    phaseTX_deg_wrap = wrapTo360(phaseTX_deg);

    phaseShifter = round(phaseTX_deg_wrap/phaseInc) * [ 0, 2^8, 2^16].' * 4

    Best,

    Zigang