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

Claim 3:
4. A spatial position-dependent 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 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, performing, by the transmitter, an I/Q domain precoding operation on the phase domain pre-coded 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 using the channel resources;
the phase domain precoding operation comprises the following steps:
S2-1: 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 phase domain 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
the I/Q domain precoding operation comprises the following steps:
S2-4: 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 I/Q domain high-dimensional precoding signal, i=1, 2, . . . , M, M represents the number of dimensions of the high-dimensional precoding signal, and M×N does not exceed the 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 m=1, 2, . . . , 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,, M
     1
    
    ×
    
     M
     2
    
    ×
    …
    ×
    
     M
     L
    
   
   =
   M
  
  ,
  
   
    
     k
     L
    
    +
    
     
      ∑
      
       m
       =
       1
      
      
       L
       -
       1
      
     
      
     
      [
      
       
        (
        
         
          k
          m
         
         -
         1
        
        )
       
       ⁢
       
        
         ∏
         
          l
          =
          
           m
           +
           1
          
         
         L
        
         
        
         M
         i
        
       
      
      ]
     
    
   
   =
   i
  
  ,, and Δfm represents a frequency increment of the mth layer; and
S2-5: performing I/Q domain high-dimensional mapping on the jth dimension ξj(t) of the phase domain pre-coded signal ξ(t) to obtain a jth high-dimensional signal ξj(t):, ξ
     j
    
    (
    t
    )
   
   =
   
    [
    
     
      
       
        
         ξ
         
          j
          ,
          1
         
        
        (
        t
        )
       
      
     
     
      
       
        
         ξ
         
          j
          ,
          2
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         ξ
         
          j
          ,
          M
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
    
    ]
   
  
  ,
  
   
    
     ∑
     
      k
      =
      1
     
     M
    
     
    
     
      ξ
      
       j
       ,
       k
      
     
     (
     t
     )
    
   
   =
   
    
     ξ
     j
    
    (
    t
    )
   
  
 

wherein a number of dimensions of the jth high-dimensional signal is M, and ξj,k(t) is a kth dimension of the jth high-dimensional signal ξj(t); and
S2-6: processing the jth high-dimensional signal according to the I/Q domain high-dimensional precoding signal to obtain a jth I/Q domain pre-coded signal xj(t):, X
    j
   
   (
   t
   )
  
  =
  
   
    [
    
     
      
       
        
         x
         
          j
          ,
          1
         
        
        (
        t
        )
       
      
     
     
      
       
        
         x
         
          j
          ,
          2
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         x
         
          j
          ,
          M
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
    
    ]
   
   =
   
    [
    
     
      
       
        
         
          ξ
          
           j
           ,
           1
          
         
         (
         t
         )
        
        ⁢
        
         
          α
          1
         
         (
         
          t
          +
          
           Δ
           ⁢
           τ
          
         
         )
        
       
      
     
     
      
       
        
         ξ
         
          j
          ,
          2
         
        
        ⁢
        
         (
         t
         )
        
        ⁢
        
         α
         2
        
        ⁢
        
         (
         
          t
          +
          
           Δ
           ⁢
           τ
          
         
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         ξ
         
          j
          ,
          M
         
        
        ⁢
        
         (
         t
         )
        
        ⁢
        
         α
         M
        
        ⁢
        
         (
         
          t
          +
          
           Δ
           ⁢
           τ
          
         
         )
        
       
      
     
    
    ], wherein xj,k(t) represents a kth dimension of the jth I/Q domain pre-coded signal, and combining, by the transmitter, the jth I/Q domain pre-coded signal into an I/Q domain pre-coded signal:, x
    ⁡
    (
    t
    )
   
   =
   
    [
    
     
      
       
        
         x
         1
        
        (
        t
        )
       
      
     
     
      
       
        
         x
         2
        
        (
        t
        )
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         x
         N
        
        (
        t
        )
       
      
     
    
    ]
   
  
  ;, and
S3: receiving, by the receiver, the I/Q domain pre-coded signal to obtain an I/Q domain initial reception signal, performing an I/Q domain matching operation on the I/Q domain initial reception signal to obtain an I/Q domain matched signal, and performing, by the receiver, a phase domain matching operation on the I/Q domain matched signal to obtain an estimation of the original signal;
a specific process of the I/Q domain matching operation is as follows:, ξ
    j
   
   (
   t
   )
  
  =
  
   
    
     [
     
      
       
        
         
          α
          1
          *
         
         (
         t
         )
        
       
       
        
         
          α
          2
          *
         
         ⁢
         
          (
          t
          )
         
        
       
       
        …
       
       
        
         
          α
          M
          *
         
         ⁢
         
          (
          t
          )
         
        
       
      
     
     ]
    
    [
    
     
      
       
        
         
          x
          ^
         
         
          j
          ,
          1
         
        
        (
        t
        )
       
      
     
     
      
       
        
         
          x
          ^
         
         
          j
          ,
          2
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
     
      
       ⋮
      
     
     
      
       
        
         
          x
          ^
         
         
          j
          ,
          M
         
        
        ⁢
        
         (
         t
         )
        
       
      
     
    
    ]
   
   =
   
    
     ∑
     
      k
      =
      1
     
     M
    
     
    
     
      
       α
       k
       *
      
      (
      t
      )
     
     ⁢
     
      
       
        x
        ^
       
       
        j
        ,
        k
       
      
      (
      t
      )
     
    
   
  
 

wherein {circumflex over (x)}(t) represents an I/Q domain initial reception signal,, α
     k
     *
    
    (
    t
    )
   
   =
   
    
     ∏
     
      m
      =
      1
     
     L
    
     
    
     exp
     [
     
      
       j
       ′
      
      ⁢
      2
      ⁢
      
       π
       ⁡
       (
       
        
         k
         m
        
        -
        1
       
       )
      
      ⁢
      Δ
      ⁢
      
       f
       
        m
         
       
      
      ⁢
      t
     
     ]
    
   
  
  ,, * represents conjugation, {circumflex over (ξ)}i(t) represents an ith dimension of an I/Q matched signal, and the finally obtained I/Q domain matched signal is as follows:, ξ
    ^
   
   (
   t
   )
  
  =
  
   [
   
    
     
      
       
        
         ξ
         ^
        
        1
       
       (
       t
       )
      
     
    
    
     
      
       
        
         ξ
         ^
        
        2
       
       ⁢
       
        (
        t
        )
       
      
     
    
    
     
      ⋮
     
    
    
     
      
       
        
         ξ
         ^
        
        N
       
       ⁢
       
        (
        t
        )
       
      
     
    
   
   ]
  
 

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
            ^
           
           X
          
          ⁢
          
           (
           t
           )
          
         
        
       
      
      ]
     
     }
    
   
   =
   
    exp
    [
    
     
      j
      ′
     
     ⁢
     
      
       ∑
       
        j
        =
        1
       
       N
      
      
       
        
         γ
         j
        
        (
        t
        )
       
       ⁢
       ∠
       ⁢
       
        
         
          ξ
          ^
         
         j
        
        (
        t
        )
       
      
     
    
    ]
   
  
 

wherein γj(t) represents a matched signal corresponding to βj(t+Δτ) and has a value meeting, γ
      i
     
     (
     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.