Patent ID: 11962344
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The method according to claim 1, wherein obtaining the second noise amount associated with the ideal electrical signal comprises:
determining the second noise amount σidealestimated associated with the ideal electrical signal according to the following:, 1
     2
    
    ⁢
    
     Q
     ⁡
     (
     
      
       y
       -
       
        P
        
         t
         ⁢
         h
        
       
      
      
       M
       ·
       
        σ
        
         ideal
         ⁢
         _
         ⁢
         estimated
        
       
      
     
     )
    
   
   +
   
    
     1
     2
    
    ⁢
    
     Q
     ⁡
     (
     
      
       
        P
        
         t
         ⁢
         h
        
       
       -
       y
      
      
       σ
       
        ideal
        ⁢
        _
        ⁢
        estimated
       
      
     
     )
    
   
  
  =
  
   B
   ⁢
   E
   ⁢
   
    R
    target
   
  
 

wherein y represents a signal power collected at a sampling point at which the ideal electrical signal is located, Pth represents an average optical power, which is an average value of optical powers of the ideal electrical signal at different level amplitudes, M represents the initial noise ratio parameter, BERtarget is a bit error rate threshold, and Q represents a tail function with standard normal distribution.