Patent ID: 11936468
Assignee: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A position-based multiple access communication method, based on a transmitter, a receiver and a plurality of channel resources, wherein the transmitter is configured to process and transmit an original signal, the receiver is configured to recover the original signal, the channel resources are used for the transmitter and the receiver, the channel resources comprise time-domain, frequency-domain, space-domain and code-domain resources, and
the method comprises the following steps:
S1: performing a time synchronization on the transmitter and several users to obtain a synchronization time t;
S2: mapping, by the transmitter, an original signal of a uth user to a uth high-dimensional original signal, wherein the uth high-dimensional original signal is as follows:, s
    ⁡
    (
    
     u
     ,
     t
    
    )
   
   =
   
    [
    
     
      
       
        
         s
         1
        
        (
        
         u
         ,
         t
        
        )
       
      
     
     
      
       
        
         s
         2
        
        (
        
         u
         ,
         t
        
        )
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         s
         M
        
        (
        
         u
         ,
         t
        
        )
       
      
     
    
    ]
   
  
  ,
  
   
    
     s
     1
    
    (
    
     u
     ,
     t
    
    )
   
   =
   
    
     
      s
      2
     
     (
     
      u
      ,
      t
     
     )
    
    =
    
     …
     =
     
      
       
        s
        M
       
       (
       
        u
        ,
        t
       
       )
      
      =
      
       
        
         s
         0
        
        (
        
         u
         ,
         t
        
        )
       
       
        M
       
      
     
    
   
  
 

wherein s0(u, t) is the original signal of the uth user, si(u, t) is an ith dimension of the uth high-dimensional original signal, i=1, 2, . . . , M, and M is a dimension of the uth high-dimensional original signal and has a value equal to a number of the channel resources;
S3: performing, by the transmitter, I/Q domain precoding on the uth high-dimensional original signal to generate a uth high-dimensional transmission signal, wherein the I/Q domain precoding process is as follows:, x
   ⁡
   (
   
    u
    ,
    t
   
   )
  
  =
  
   
    [
    
     
      
       
        
         x
         1
        
        (
        
         u
         ,
         t
        
        )
       
      
     
     
      
       
        
         x
         2
        
        (
        
         u
         ,
         t
        
        )
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         x
         M
        
        (
        
         u
         ,
         t
        
        )
       
      
     
    
    ]
   
   =
   
    [
    
     
      
       
        
         
          s
          1
         
         (
         
          u
          ,
          t
         
         )
        
        ⁢
        
         
          α
          1
         
         (
         
          u
          ,
          
           t
           +
           
            Δ
            ⁢
            
             τ
             u
            
           
          
         
         )
        
       
      
     
     
      
       
        
         
          s
          2
         
         (
         
          u
          ,
          t
         
         )
        
        ⁢
        
         
          α
          2
         
         (
         
          u
          ,
          
           t
           +
           
            Δ
            ⁢
            
             τ
             u
            
           
          
         
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         
          s
          M
         
         (
         
          u
          ,
          t
         
         )
        
        ⁢
        
         
          α
          M
         
         (
         
          u
          ,
          
           t
           +
           
            Δ
            ⁢
            
             τ
             u
            
           
          
         
         )
        
       
      
     
    
    ]
   
  
 

wherein x(u, t) represents the uth high-dimensional transmission signal, xi(u, t) represents an ith dimension of the uth high-dimensional transmission signal, αi(u, t+Δτ) represents an ith dimension of a uth precoding signal, i=1, 2, . . . , M, and Δτu represents a transmission delay from the transmitter to the uth user;
S4: summing, by the transmitter, all the uth high-dimensional transmission signals to obtain a high-dimensional total transmission signal:, x
    ~
   
   (
   t
   )
  
  =
  
   
    ∑
    
     u
     =
     1
    
    U
   
   
    x
    ⁡
    (
    
     u
     ,
     t
    
    )
   
  
 

wherein U represents a number of users; broadcasting, by the transmitter, the high-dimensional total transmission signal to a plurality of users by using the channel resources, each of the channel resources transmitting one dimension of the high-dimensional total transmission signal; and
S5: receiving, by the uth user, the high-dimensional total transmission signal to obtain a high-dimensional total receiving signal, and performing an I/Q domain matching operation on the high-dimensional total receiving signal to obtain an estimate ŝ0(u, t) for a uth original signal.