Electronic device for wireless communications, and wireless communication method
An electronic device for wireless communications, and a wireless communication method. The electronic device includes: one or more processors, each processor configured to: respectively conduct space-domain filtering on received signals of a plurality of antennas, respectively; estimate frequency shift of corresponding received signals based on the signals, on which space-domain filtering is conducted, of various antennas; estimate, according to the estimated frequency shift and a parameter of the space-domain filtering, a Doppler frequency shift generated by the relative motion between transceiving ends of the received signals and a carrier frequency offset generated by frequency inconsistency of the transceiving ends; and conduct frequency preprocessing on sent signals of the antennas according to the estimated Doppler frequency shift, and/or control to feed back information related to the estimated Doppler frequency shift to a signal sending end.
1. An electronic device for wireless communication, comprising:
at least one processor configured to
perform spatial filtering respectively on received signals of a plurality of antennas;
estimate, based on the spatially-filtered signal of each of the antennas, a frequency offset of the corresponding received signal;
estimate, based on parameters of the spatial filtering and the estimated frequency offset, a Doppler shift caused by a relative movement between a receiving end and a transmitting end of the received signal and a carrier frequency offset caused by frequency inconsistency of the receiving end and the transmitting end; and
perform frequency preprocessing on a transmission signal of the antenna based on the estimated Doppler shift, and/or perform control to feed back information on the estimated Doppler shift to the transmitting end of the received signal.
2. The electronic device according to claim 1 , wherein the Doppler shift and the carrier frequency offset are estimated based on a relation that the frequency offset is a linear combination of the Doppler shift and the carrier frequency offset.
3. The electronic device according to claim 2 , wherein the Doppler shift and the carrier frequency offset are estimated by using a weighted least square method, and wherein the weighting is performed based on signal-to-noise ratios of the respective spatially-filtered signals of the plurality of antennas.
4. The electronic device according to claim 3 , wherein the relation of the linear combination is determined based on the signal-to-noise ratio of the spatially-filtered signal of each of the plurality of antennas, a direction angle φ n for the spatial filtering and a direction angle θ R of the relative movement between the receiving end and the transmitting end of the received signal.
5. The electronic device according to claim 4 , wherein estimated values of the Doppler shift and the carrier frequency offset are calculated using an observation matrix and a weighting matrix, wherein the observation matrix is related to the direction angle φ n and the direction angle θ R , and the weighting matrix is related to the signal-to-noise ratio of the spatially-filtered signal.
6. The electronic device according to claim 5 , wherein the observation matrix is predetermined based on the direction angle φ n and the direction angle θ R .
7. The electronic device according to claim 5 , wherein the weighting matrix is determined based on the signal-to-noise ratio estimated frame-by-frame.
8. The electronic device according to claim 1 , wherein the frequency offset is estimated by using an estimation method based on training sequence or a blind estimation method based on signal statistical information.
9. The electronic device according to claim 3 , wherein the signal-to-noise ratio is estimated by using a self-correlation method.
10. The electronic device according to claim 1 , wherein the processor is configured to estimate the Doppler shift and the carrier frequency offset frame-by-frame for the received signal.
11. The electronic device according to claim 1 , wherein the frequency preprocessing comprises: performing preprocessing by adopting different Doppler shift estimations for different spatial directions, and weighting the transmission signal with signal-to-noise ratios estimated for the spatial received signals.
12. The electronic device according to claim 1 , wherein the processor is further configured to:
calibrate a frequency of a local frequency generator based on the estimated carrier frequency offset.
13. The electronic device according to claim 1 , wherein the information on the estimated Doppler shift further comprises: a direction angle of spatial filtering corresponding to the signal with a highest signal-to-noise ratio among the spatially-filtered signals.
14. A wireless communication method, comprising:
performing spatial filtering respectively on received signals of a plurality of antennas;
estimating, based on the spatially-filtered signal of each of the antennas, a frequency offset of the corresponding received signal;
estimating, based on parameters of the spatial filtering and the estimated frequency offset, a Doppler shift caused by a relative movement between a receiving end and a transmitting end of the received signal and a carrier frequency offset caused by frequency inconsistency of the receiving end and the transmitting end; and
performing frequency preprocessing on a transmission signal of the antenna based on the estimated Doppler shift, and/or performing control to feed back information on the estimated Doppler shift to the transmitting end of the received signal.
15. The method according to claim 14 , wherein the Doppler shift and the carrier frequency offset are estimated based on a relation that the frequency offset is a linear combination of the Doppler shift and the carrier frequency offset.
16. The method according to claim 15 , wherein the Doppler shift and the carrier frequency offset are estimated by using a weighted least square method, and wherein the weighting is performed based on signal-to-noise ratios of the respective spatially-filtered signals of the plurality of antennas.
17. The method according to claim 14 , wherein estimated values of the Doppler shift and the carrier frequency offset are calculated using an observation matrix and a weighting matrix, wherein the observation matrix is predetermined based on a direction angle φ n for the spatial filtering and a direction angle θ R of the relative movement between the receiving end and the transmitting end of the received signal.
18. The method according to claim 14 , wherein estimated values of the Doppler shift and the carrier frequency offset are calculated using an observation matrix and a weighting matrix, wherein the weighting matrix is determined based on the signal-to-noise ratio of the spatially filtered signal estimated frame-by-frame.
19. The method according to claim 14 , wherein the Doppler shift and the carrier frequency offset are estimated frame-by-frame for the received signal.
20. The method according to claim 14 , wherein the information on the estimated Doppler shift further comprises: a direction angle of spatial filtering corresponding to the signal with a highest signal-to-noise ratio among the spatially-filtered signals.