Sign in
Microsoft.com
 
Microsoft
 
 
 
Microsoft >
> 
> 
Calculation of average DC at __CalDCOffsetToXmm0()

Unanswered Calculation of average DC at __CalDCOffsetToXmm0()

  • Wednesday, 11 May, 2011 1:29 AM
     
     
    Sign In to Vote
    0

     

    Hi,

     

    I'm just wondering if there is a special reason to use xmm0 twice to calculate DCOffset of a signal block?

    I thought that DCOffset of a signal block would be like (sum(xmm0)+sum(xmm1)+...+sum(xmm6))/28 (sum(xmm#) means summation of four complex signals) 

    But in SORA, to my understanding, it is (sum(xmm0)*2+sum(xmm1)+...+sum(xmm6))/32

     

    Thanks

    Dongho

     

All Replies

  • Monday, 16 May, 2011 9:48 AM
    Moderator
     
     
    Sign In to Vote
    0

    Hi Dongho,

    I think it's an approximation. The purpose is to save computational cost. Divided by 32 is much cheaper than divided by 28 in terms of computational cost. 

    -Jiansong