Patent ID: 11916708
Assignee: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

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

wherein βj(t+Δτ) represents a jth dimension of the high-dimensional precoding signal, j=1, 2, . . . , N, N represents a number of dimensions of the high-dimensional precoding signal, and N does not exceed a number of the channel resources,, β
    j
   
   (
   
    t
    +
    
     Δ
     ⁢
     τ
    
   
   )
  
  =
  
   δ
   +
   
    
     ∏
     
      p
      =
      1
     
     T
    
     
    
     
      A
      
       p
       ,
       
        n
        p
       
      
     
     ⁢
     
      cos
      [
      
       2
       ⁢
       
        π
        ⁡
        (
        
         
          n
          p
         
         -
         1
        
        )
       
       ⁢
       Δ
       ⁢
       
        
         f
         p
        
        (
        
         t
         +
         
          Δ
          ⁢
          τ
         
        
        )
       
      
      ]
     
    
   
  
 

wherein T represents a number of phase domain precoding layers, T≥1, 1≤p≤T, np represents an index of a pth layer of phase domain precoding branches, 1≤np≤Np, Np represents a number of the pth layer of phase domain precoding branches,, N
     1
    
    ×
    
     N
     2
    
    ×
    …
    ×
    
     N
     T
    
   
   =
   N
  
  ,
  
   
    
     n
     T
    
    +
    
     
      ∑
      
       p
       =
       1
      
      
       T
       -
       1
      
     
      
     
      [
      
       
        (
        
         
          n
          p
         
         -
         1
        
        )
       
       ⁢
       
        
         ∏
         
          i
          =
          
           p
           +
           1
          
         
         T
        
         
        
         N
         l
        
       
      
      ]
     
    
   
   =
   j
  
  ,, Δfp represents a frequency increment of the pth layer, Ap,np represents an amplitude of a precoding signal on a npth branch in the pth layer of phase domain precoding branch, and δ is a normal number agreed by the transmitter and the receiver in advance and has a value meeting, δ
    +
    
     
      ∏
      
       p
       =
       1
      
      T
     
      
     
      
       A
       
        p
        ,
        
         n
         p
        
       
      
      ⁢
      
       cos
       [
       
        2
        ⁢
        
         π
         ⁡
         (
         
          
           n
           p
          
          -
          1
         
         )
        
        ⁢
        Δ
        ⁢
        
         
          f
          p
         
         (
         
          t
          +
          
           Δ
           ⁢
           τ
          
         
         )
        
       
       ]
      
     
    
   
   >
   0
  
  ;
 

S2-2: performing phase domain high-dimensional mapping on a phase ∠s0(t) of the original signal to obtain a high-dimensional original phase signal ∠s(t):, ∠
    ⁢
    
     s
     ⁡
     (
     t
     )
    
   
   =
   
    [
    
     
      
       
        ∠
        ⁢
        
         
          s
          1
         
         (
         t
         )
        
       
      
     
     
      
       
        ∠
        ⁢
        
         s
         2
        
        ⁢
        
         (
         t
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        ∠
        ⁢
        
         s
         N
        
        ⁢
        
         (
         t
         )
        
       
      
     
    
    ]
   
  
  ,
  
   
    
     ∑
     
      j
      =
      1
     
     N
    
     
    
     ∠
     ⁢
     
      
       s
       j
      
      (
      t
      )
     
    
   
   =
   
    ∠
    ⁢
    
     
      s
      0
     
     (
     t
     )
    
    ⁢
    
     mod
     ⁡
     (
     
      2
      ⁢
      π
     
     )
    
   
  
 

wherein a number of dimensions of the high-dimensional original phase signal is N, sj(t) represents a jth dimension of the high-dimensional original signal, and mod is a remainder function; and
S2-3: processing the high-dimensional original phase signal according to the high-dimensional precoding signal to obtain a phase domain pre-coded signal ξ(t):, ξ
   ⁡
   (
   t
   )
  
  =
  
   
    [
    
     
      
       
        
         ξ
         1
        
        (
        t
        )
       
      
     
     
      
       
        
         ξ
         2
        
        ⁢
        
         (
         t
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         ξ
         N
        
        ⁢
        
         (
         t
         )
        
       
      
     
    
    ]
   
   =
   
    [
    
     
      
       
        exp
        [
        
         
          j
          ′
         
         ⁢
         ∠
         ⁢
         
          
           s
           1
          
          (
          t
          )
         
         ⁢
         
          
           β
           1
          
          (
          
           t
           +
           
            Δ
            ⁢
            τ
           
          
          )
         
        
        ]
       
      
     
     
      
       
        exp
        [
        
         
          j
          ′
         
         ⁢
         ∠
         ⁢
         
          s
          2
         
         ⁢
         
          (
          t
          )
         
         ⁢
         
          β
          2
         
         ⁢
         
          (
          
           t
           +
           
            Δ
            ⁢
            τ
           
          
          )
         
        
        ]
       
      
     
     
      
       ⋮
      
     
     
      
       
        exp
        [
        
         
          j
          ′
         
         ⁢
         ∠
         ⁢
         
          s
          N
         
         ⁢
         
          (
          t
          )
         
         ⁢
         
          β
          N
         
         ⁢
         
          (
          
           t
           +
           
            Δ
            ⁢
            τ
           
          
          )
         
        
        ]
       
      
     
    
    ]
   
  
 

wherein j′=√{square root over (−1)}, and ξj(t) represents a jth dimension of the phase domain pre-coded signal; and
S3: receiving, by the receiver, the phase domain pre-coded signal to obtain a phase domain initial reception signal, and performing a phase domain matching operation on the phase domain initial reception signal to obtain an estimation of the original signal;
a specific process of the phase domain matching operation is as follows:, s
     ^
    
    0
    ′
   
   (
   t
   )
  
  =
  
   
    exp
    ⁢
    
     {
     
      
       
        j
        ′
       
       [
       
        
         
          
           
            γ
            1
           
           ⁢
           
            (
            t
            )
           
          
         
         
          
           
            γ
            2
           
           ⁢
           
            (
            t
            )
           
          
         
         
          …
         
         
          
           
            γ
            N
           
           ⁢
           
            (
            t
            )
           
          
         
        
       
       ]
      
      [
      
       
        
         
          ∠
          ⁢
          
           
            
             ξ
             ^
            
            1
           
           (
           t
           )
          
         
        
       
       
        
         
          ∠
          ⁢
          
           
            
             ξ
             ^
            
            2
           
           (
           t
           )
          
         
        
       
       
        
         ⋮
        
       
       
        
         
          ∠
          ⁢
          
           
            
             ξ
             ^
            
            N
           
           (
           t
           )
          
         
        
       
      
      ]
     
     }
    
   
   =
   
    exp
    [
    
     
      j
      ′
     
     ⁢
     
      
       ∑
       
        j
        =
        1
       
       N
      
       
      
       
        
         γ
         j
        
        (
        t
        )
       
       ⁢
       ∠
       ⁢
       
        
         
          ξ
          ^
         
         j
        
        (
        t
        )
       
      
     
    
    ]
   
  
 

wherein {circumflex over (ξ)}(t)=[{circumflex over (ξ)}1(t) {circumflex over (ξ)}2(t) . . . {circumflex over (ξ)}N(t)]T represents a phase domain initial reception signal, a superscript T represents transposition, [∠{circumflex over (ξ)}1(t) ∠{circumflex over (ξ)}2(t) . . . ∠{circumflex over (ξ)}N(t)]T represents a phase of the phase domain initial reception signal, ∠ represents a phase taking operation, γj(t) represents a matched signal corresponding to βj(t+Δτ) and has a value meeting, γ
      j
     
     (
     t
     )
    
    ⁢
    
     {
     
      δ
      +
      
       
        ∏
        
         p
         =
         1
        
        T
       
        
       
        
         A
         
          p
          ,
          
           n
           p
          
         
        
        ⁢
        
         cos
         [
         
          2
          ⁢
          
           π
           ⁡
           (
           
            
             n
             p
            
            -
            1
           
           )
          
          ⁢
          Δ
          ⁢
          
           f
           p
          
          ⁢
          t
         
         ]
        
       
      
     
     }
    
   
   =
   
    1
    ⁢
      
    
     mod
     ⁡
     (
     
      2
      ⁢
      π
     
     )
    
   
  
  ,, and ŝ′0(t) represents an estimation of the original signal.