Patent ID: 11863267
Assignee: INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 4:
5. The channel estimation apparatus of claim 3, wherein the transmitter further comprises
a transmission memory module configured to store in advance a codebook including at least two or more precoding vectors including a phase delay value for each transmission antenna connected to the phase shift network calculated by (Equation 3) below,, ω
      i
     
     =
     
      [
      
       
        
         1
        
       
       
        
         
          e
          
           j
           ⁢
           
            
             θ
             2
            
            (
            l
            )
           
          
         
        
       
       
        
         ⋮
        
       
       
        
         
          e
          
           j
           ⁢
           
            
             θ
             
              N
              tx
             
            
            (
            i
            )
           
          
         
        
       
      
      ]
     
    
   
   
    
     (
     
      Equation
      ⁢
         
      3
     
     )
    
   
  
 

(wi: precoding vector, i: codebook number).