Patent ID: 11901987
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. The method of claim 12, wherein for a multi-layer transmission in which the rank value >1, further comprising determining a rank-k beamforming precoder by:
sorting right singular vectors of SVD of UE by a correlation between a right singular vector and the steering vector such that:, ∑
       
     
     
      i
      =
      1
     
     l
    
    ⁢
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       h
       i
       H
      
      ⁢
      
       v
       1
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
   
   ≤
   
    
     
      ∑
       
     
     
      i
      =
      1
     
     l
    
    ⁢
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       h
       i
       H
      
      ⁢
      
       v
       2
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
   
   ≤
   …
   ≤
   
    
     
      ∑
       
     
     
      i
      =
      1
     
     l
    
    ⁢
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       h
       i
       H
      
      ⁢
      
       v
       k
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
   
   ≤
   …
  
     
  ,, where 1, 2, . . . , k, . . . are indexes obtained by the sorting; and
forming ZF beamforming precoder of rank k by k right singular vectors that satisfy:, ∑
       
     
     
      j
      =
      1
     
     k
    
    ⁢
    
     
      ∑
       
     
     
      i
      =
      1
     
     l
    
    ⁢
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       h
       i
       H
      
      ⁢
      
       ν
       j
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
   
   ≤
   Thred
  
  ,
 

where i is an i-th vector of ES channel matrix ES, vk is a k-th vector of a unitary matrix, vj is a j-th vector of the unitary matrix, and Thred is the threshold parameter.