DIFFERENTIAL POWER ANALYSIS FOR OTFS PILOT INTERFERENCE DETECTION

摘要

The invention relates to the detection of interference of the pilot symbol with data symbols in an OTFS coded transmission. Method for detecting OTFS pilot interference comprising: receiving delay–Doppler-domain samples y[k,l] of a received OTFS delay-Doppler frame (10'), 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; summing the squares of the amplitudes of the delay-Doppler domain samples y[k,l] of the delay- Doppler grid positions evaluated for the channel estimation to establish the received non- interfering pilot power P_pilot; summing the squares of the amplitudes of all the delay-Doppler domain samples y[k,l] of the complete delay-Doppler grid (30) to establish the total received frame power P_frame; comparing a pilot power ratio R_{pilot_power} derived by dividing the non-interfering pilot power P_pilot by the total received frame power P_frame with a guard space ratio R_{guard_space} derived by dividing the sum of the number of guard and pilot grid spaces A_{guard_space} in the transmitted OTFS frame by the total number of grid spaces of the transmitted OTFS frame A_frame; produce an interference signal (1090) when the comparison indicates a deviation above a tolerable deviation threshold. The invention further relates to a device (1000) for dynamic pilot interference detection.