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

Claim 5:
6. The channel estimation apparatus of claim 1, wherein the receiver comprises:
a reception communication module configured to perform frame synchronization to obtain predetermined beamforming information included in a frame transmitted from the transmitter, and receive transmission pilot signals from the transmitter using the obtained beamforming information;
a channel estimation module configured to, when the beamforming use of the transmitter is confirmed using the beamforming information obtained from the reception communication module, generate reception pilot signals based on the received transmission pilot signals and estimate a channel using the transmission pilot signals and the reception pilot signals;
an optimal precoding vector detection module configured to detect an optimal precoding vector to be applied to the transmitter from among precoding vectors included in a pre-stored codebook by using the channel information estimated by the channel estimation module;
a transmission/reception switching switch configured between the reception communication module and the single reception antenna to switch a transmission/reception state of the reception communication module for the single reception antenna;
a reception control module configured to switch a transmission/reception state of the reception communication module by controlling a switching operation of the transmission/reception switching switch; and
a reception 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 transmitter calculated by the following (Equation 3),, ω
      i
     
     =
     
      [
      
       
        
         1
        
       
       
        
         
          e
          
           j
           ⁢
           
            
             θ
             2
            
            (
            i
            )
           
          
         
        
       
       
        
         ⋮
        
       
       
        
         
          e
          
           j
           ⁢
           
            
             θ
             
              N
              tx
             
            
            (
            i
            )
           
          
         
        
       
      
      ]
     
    
   
   
    
     (
     
      Equation
      ⁢
         
      3
     
     )
    
   
  
 

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