Patent ID: 11901975
Assignee: INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The downlink channel state information feedback method of claim 4, wherein a codeword Fu,p is derived through Equation (4) using the measurement vector yu,p acquired through Equation (3) and by searching a most suitable codeword,, F
      
       u
       ,
       p
      
     
     =
     
      
       
        arg
        ⁢
          
        max
       
       
        
         j
         =
         1
        
        ,
          
        …
          
        ,
          
        
         2
         B
        
       
      
      ⁢
      
       
        ❘
        "\[LeftBracketingBar]"
       
       
        
         
          y
          ~
         
         
          u
          ,
          p
         
         H
        
        ⁢
        
         w
         j
        
       
       
        ❘
        "\[RightBracketingBar]"
       
      
     
    
   
   
    
     (
     4
     )
    
   
  
 

where u (u=1, . . . ,U) denotes a number of users, p (p=1, . . . ,P) denotes a number of dominant paths between the transmitter and the RIS, and j denotes a size of a codebook.