Patent ID: 11876568
Assignee: GENERAL TEST SYSTEMS INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 11:
12. The non-transitory computer readable storage medium of claim 9, wherein a test is performed based on a formula:, [
      
        
          
            
              R
              1
            
          
        
        
          
            
              R
              2
            
          
        
        
          
            ⋮
          
        
        
          
            
              R
              N
            
          
        
      
      ]
    
    =
    
      
        E
        *
        
          [
          
            
              
                
                  T
                  1
                
              
            
            
              
                
                  T
                  2
                
              
            
            
              
                ⋮
              
            
            
              
                
                  T
                  N
                
              
            
          
          ]
        
      
      =
      
        
          
            [
            
              
                
                  
                    e
                    
                      j
                      ⁢
                      
                        
                      
                      ⁢
                      
                        χ
                        11
                      
                    
                  
                
                
                  0
                
                
                  …
                
                
                  0
                
              
              
                
                  0
                
                
                  
                    e
                    
                      j
                      (
                      
                        
                      
                      ⁢
                      
                        χ
                        21
                      
                      )
                    
                  
                
                
                  …
                
                
                  0
                
              
              
                
                  ⋮
                
                
                  ⋮
                
                
                  ⋱
                
                
                  ⋮
                
              
              
                
                  0
                
                
                  0
                
                
                  …
                
                
                  
                    e
                    
                      j
                      (
                      
                        
                      
                      ⁢
                      
                        χ
                        
                          N
                          ⁢
                          
                            
                          
                          ⁢
                          1
                        
                      
                      )
                    
                  
                
              
            
            ]
          
          *
          
            [
            
              
                
                  
                    T
                    1
                  
                
              
              
                
                  
                    T
                    2
                  
                
              
              
                
                  ⋮
                
              
              
                
                  
                    T
                    N
                  
                
              
            
            ]
          
        
        =
        
          [
          
            
              
                
                  
                    T
                    1
                  
                  *
                  
                    e
                    
                      j
                      ⁢
                      
                        
                      
                      ⁢
                      
                        χ
                        11
                      
                    
                  
                
              
            
            
              
                
                  
                    T
                    2
                  
                  *
                  
                    e
                    
                      j
                      ⁢
                      
                        
                      
                      ⁢
                      
                        χ
                        21
                      
                    
                  
                
              
            
            
              
                ⋮
              
            
            
              
                
                  
                    T
                    N
                  
                  *
                  
                    e
                    
                      j
                      ⁢
                      
                        
                      
                      ⁢
                      
                        χ
                        
                          N
                          ⁢
                          
                            
                          
                          ⁢
                          1
                        
                      
                    
                  
                
              
            
          
          ]
        
      
    
  
  ,

where, N represents the number of antennas of the device under test, T represents an excitation signal at each test port, R represents a received signal at each receiver port, ej(χn1) represents phase information, and E is obtained from the propagation matrix.