Patent ID: 11962445
Assignee: VOLKSWAGEN AKTIENGESELLSCHAFT
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for detecting Orthogonal Time Frequency Space (OTFS) pilot interference, the method comprising:
receiving delay-Doppler-domain samples y[k,l] of a received OTFS delay-Doppler frame associated with a delay-Doppler grid, wherein the grid has N grid spaces associated with a Doppler dimension quantized in, 1
  NT, and M grid spaces in the delay dimension quantized in, 1
   
    
     M
     ·
     Δ
    
    ⁢
    f
   
  
  ,, wherein M an N are integers, wherein the delay-Doppler domain samples y[k,l] are derived by a two-dimensional symplectic Fourier transformation of time-frequency domain samples Y[n,m] resulting from sampling a time-varying received OFTS coded signal N times with a sampling time T and for M frequency subcarriers with a bandwidth resolution of Δf;
summing the squares of the amplitudes of the delay-Doppler domain samples y[k,l] of the delay-Doppler grid positions evaluated for channel estimation to establish a received non-interfering pilot power Ppilot;
summing the squares of the amplitudes of all the delay-Doppler domain samples y[k,l] of a complete delay-Doppler grid to establish a total received frame power Pframe;
comparing a pilot power ratio Rpilot_power derived by dividing the non-interfering pilot power Ppilot by the total received frame power Pframe with a guard space ratio Rguard_space derived by dividing the sum of the number of guard and pilot grid spaces Aguard_space in the transmitted OTFS frame by the total number of grid spaces of a transmitted OTFS frame Aframe; and
producing an interference signal when the comparison indicates a deviation above a tolerable deviation threshold.