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

Claim 3:
4. A spatial position-dependent dual 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, performing, by the transmitter, a phase domain precoding operation on the I/Q domain pre-coded signal to obtain a phase domain pre-coded signal, and transmitting, by the transmitter, the phase domain pre-coded signal to the receiver by using the plurality of channel resources; and
S3: receiving, by the receiver, the phase domain pre-coded signal to obtain a phase domain initial received signal, performing a phase domain matching operation on the phase domain initial received signal to obtain a phase domain matched signal, and performing, by the receiver, an I/Q domain matching operation on the phase domain matched signal to obtain an estimate for the original signal,, wherein in the step 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 αi(t+Δτ) represents an ith dimension of the high-dimensional precoding signal, i=1, 2, . . . , M, M represents a number of dimensions of the high-dimensional precoding signal, and M does not exceed a number of the channel resources,, α
    i
   
   (
   
    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 the I/Q domain 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
the phase domain precoding operation comprises the following steps:
S2-4: generating, by the transmitter, a phase domain 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 M×N does not exceed the 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
     ⁢
        
     and
     ⁢
        
     
      n
      T
     
    
    +
    
     
      ∑
      
       p
       =
       1
      
      
       T
       -
       1
      
     
     
      [
      
       
        (
        
         
          n
          p
         
         -
         1
        
        )
       
       ⁢
       
        
         
          ∏
          
           l
           =
           
            p
            +
            1
           
          
         
         T
        
        
         N
         l
        
       
      
      ]
     
    
   
   =
   j
  
 

 are met, 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 branches, 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
          +
          Δτ
         
         )
        
       
       ]
      
     
    
   
   >
   0
  
  ;
 

S2-5: performing phase domain high-dimensional mapping on a phase ∠xi(t) of the ith dimension of the I/Q domain pre-coded signal to obtain an ith high-dimensional phase signal ∠xi(t):, ∠
    ⁢
    
     
      x
      i
     
     (
     t
     )
    
   
   =
   
    [
    
     
      
       
        ∠
        ⁢
        
         x
         
          i
          ,
          1
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
     
      
       
        ∠
        ⁢
        
         x
         
          i
          ,
          2
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        ∠
        ⁢
        
         x
         
          i
          ,
          N
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
    
    ]
   
  
  ,
  
   
    
     ∑
     
      k
      =
      1
     
     N
    
    
     ∠
     ⁢
     
      
       x
       
        i
        ,
        k
       
      
      (
      t
      )
     
    
   
   =
   
    ∠
    ⁢
    
     
      x
      i
     
     (
     t
     )
    
    ⁢
    
     mod
     ⁡
     (
     
      2
      ⁢
      π
     
     )
    
   
  
 

wherein a number of dimensions of the high-dimensional phase signal is N, ∠xi,k(t) represents a kth dimension of the ith high-dimensional phase signal, k=1, 2, . . . , N, and mod is a remainder function; and
S2-6: processing the ith high-dimensional phase signal according to the phase domain high-dimensional precoding signal to obtain an ith phase domain pre-coded signal ξi(t):, ξ
    i
   
   (
   t
   )
  
  =
  
   
    [
    
     
      
       
        
         ξ
         
          i
          ,
          1
         
        
        (
        t
        )
       
      
     
     
      
       
        
         ξ
         
          i
          ,
          2
         
        
        (
        t
        )
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         ξ
         
          i
          ,
          N
         
        
        (
        t
        )
       
      
     
    
    ]
   
   =
   
    [
    
     
      
       
        
         exp
         [
         
          j
          ⁢
          ∠
          ⁢
          
           
            x
            
             i
             ,
             1
            
           
           (
           t
           )
          
          ⁢
          
           
            β
            1
           
           (
           
            t
            +
            Δτ
           
           )
          
         
         ]
        
         
       
      
     
     
      
       
        exp
        [
        
         j
         ⁢
         ∠
         ⁢
         
          
           x
           
            i
            ,
            2
           
          
          (
          t
          )
         
         ⁢
         
          
           β
           2
          
          (
          
           t
           +
           Δτ
          
          )
         
        
        ]
       
      
     
     
      
       ⋮
      
     
     
      
       
        exp
        [
        
         j
         ⁢
         ∠
         ⁢
         
          
           x
           
            i
            ,
            N
           
          
          (
          t
          )
         
         ⁢
         
          
           β
           N
          
          (
          
           t
           +
           Δτ
          
          )
         
        
        ]
       
      
     
    
    ]
   
  
 

wherein ξi,k(t) represents a kth dimension of the ith phase domain pre-coded signal, and combining, by the transmitter, the ith phase domain pre-coded signal into a phase domain pre-coded signal:, ξ
   ⁡
   (
   t
   )
  
  =
  
   
    [
    
     
      
       
        
         ξ
         1
        
        (
        t
        )
       
      
     
     
      
       
        
         ξ
         2
        
        (
        t
        )
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         ξ
         M
        
        (
        t
        )
       
      
     
    
    ]
   
   .