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

Claim 0:
1. A spatial position-dependent I/Q domain modulation 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 the receiver to obtain a synchronization time;
S2: performing, by the transmitter, an I/Q domain precoding operation on the original signal to obtain an I/Q domain pre-coded signal, and transmitting, by the transmitter, the I/Q domain pre-coded signal to the receiver by using the plurality of channel resources;
wherein in S2, the I/Q domain precoding operation comprises the following steps:
S2-1: generating, by the transmitter, an I/Q domain high-dimensional precoding signal α(t+Δτ) according to the synchronization time t and a transmission delay Δτ to the receiver:, α
   ⁡
   (
   
    t
    +
    
     Δ
     ⁢
     τ
    
   
   )
  
  =
  
   [
   
    
     
      
       
        α
        1
       
       (
       
        t
        +
        
         Δ
         ⁢
         τ
        
       
       )
      
     
    
    
     
      
       
        α
        2
       
       (
       
        t
        +
        
         Δ
         ⁢
         τ
        
       
       )
      
     
    
    
     
      ⋮
     
    
    
     
      
       
        α
        M
       
       (
       
        t
        +
        
         Δ
         ⁢
         τ
        
       
       )
      
     
    
   
   ]
  
 

wherein represents an ith dimension of the I/Q domain high-dimensional precoding signal, i=1, 2, . . . , M, M represents a number of dimensions of the I/Q domain high-dimensional precoding signal, and M does not exceed a number of the channel resources,, α
    1
   
   (
   
    t
    +
    
     Δ
     ⁢
     τ
    
   
   )
  
  =
  
   
    ∏
    
     m
     =
     1
    
    L
   
    
   
    exp
    [
    
     
      -
      j
     
     ⁢
     2
     ⁢
     
      π
      ⁡
      (
      
       
        k
        m
       
       -
       1
      
      )
     
     ⁢
       
     Δ
     ⁢
     
      
       f
       m
      
      (
      
       t
       +
       
        Δ
        ⁢
        τ
       
      
      )
     
    
    ]
   
  
 

wherein j>√{square root over (−1)}, 1≤m≤L, L represents a number of I/Q domain precoding layers, L≥1, km represents an index of an mth layer of I/Q domain precoding branches, 1≤km≤Mm, Mm represents a number of the mth layer of I/Q domain precoding branches, M1×M2× . . . ×ML=M and, k
    L
   
   +
   
    
     ∑
     
      m
      =
      1
     
     
      L
      -
      1
     
    
     
    
     [
     
      
       (
       
        
         k
         m
        
        -
        1
       
       )
      
      ⁢
      
       
        ∏
        
         l
         =
         
          m
          +
          1
         
        
        L
       
        
       
        M
        l
       
      
     
     ]
    
   
  
  =
  i
 

 are met, and Δfm represents a frequency increment of the mth layer;
S2-2: performing high-dimensional mapping on the original signal s0(t) to obtain a high-dimensional original signal s(t):, s
    ⁡
    (
    t
    )
   
   =
   
    [
    
     
      
       
        
         s
         
          1
           
         
        
        (
        t
        )
       
      
     
     
      
       
        
         s
         2
        
        ⁢
        
         (
         t
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         s
         
          M
           
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
    
    ]
   
  
  ,
  
   
    
     ∑
     
      i
      =
      1
     
     M
    
     
    
     
      
       s
       i
      
       
     
     (
     t
     )
    
   
   =
   
    
     s
     
      0
       
     
    
    (
    t
    )
   
  
 

wherein a number of dimensions of the high-dimensional original signal is M, and si(t) represents an ith dimension of the high-dimensional original signal; and
S2-3: processing the high-dimensional original signal according to a high-dimensional precoding signal to obtain an I/Q domain pre-coded signal x(t):, x
   ⁡
   (
   t
   )
  
  =
  
   
    [
    
     
      
       
        
         x
         
          1
           
         
        
        (
        t
        )
       
      
     
     
      
       
        
         x
         2
        
        (
        t
        )
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         x
         
          M
           
         
        
        (
        t
        )
       
      
     
    
    ]
   
   =
   
    [
    
     
      
       
        
         
          s
          
           1
            
          
         
         (
         t
         )
        
        ⁢
        
         
          α
          1
         
         (
         
          t
          +
          
           Δ
           ⁢
           τ
          
         
         )
        
       
      
     
     
      
       
        
         s
         
          2
           
         
        
        ⁢
        
         (
         t
         )
        
        ⁢
        
         α
         2
        
        ⁢
        
         (
         
          t
          +
          
           Δ
           ⁢
           τ
          
         
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         s
         
          M
           
         
        
        ⁢
        
         (
         t
         )
        
        ⁢
        
         α
         M
        
        ⁢
        
         (
         
          t
          +
          
           Δ
           ⁢
           τ
          
         
         )
        
       
      
     
    
    ]
   
  
 

wherein xi(t) represents an ith dimension of the I/Q domain pre-coded signal; and
S3: receiving, by the receiver, the I/Q domain pre-coded signal to obtain an I/Q domain initial received signal, and performing an I/Q domain matching operation on the I/Q domain initial received signal to obtain an estimate for the original signal.