Method and system for wireless local area network (WLAN) phase shifter training
View Patent ↗Aspects of a method and system for wireless local area network (WLAN) phase shifter training are presented. Aspect of the system may enable a receiving station, at which is located a plurality of receiving antennas, to estimate the relative phase at which each of the receiving antennas receives signals from a transmitting station. This process may be referred to as phase shifter training. After determining the relative phase for each of the receiving antennas, the receiving station may process received signals by phase shifting the signals received via each of the receiving antennas in accordance with the relative phase shifts determined during the phase shifter training process. Signals received via a selected one of the receiving antennas may be unshifted. The processed signals may be combined to generate a diversity reception signal.
1. A wireless device comprising:
a plurality of antennas configured to receive a reference signal and a subsequent signal;
a wireless receiver coupled to the plurality of antennas; and
a processor coupled to the receiver, the processor and receiver configured to:
generate relative phase shift values for at least two antennas of the plurality of antennas based on a phase of the reference signal as received by the at least two antennas;
generate phase shifted versions of the subsequent signal for the at least two antennas according to corresponding generated relative phase shift values; and
combine at least two generated phase shifted versions of the subsequent signal to enable diversity reception.
2. The wireless device of claim 1 , wherein one of the generated relative phase shift values is a reference phase shift value.
3. The wireless device of claim 2 , wherein the reference phase shift value comprises a zero phase shift.
4. The wireless device of claim 1 , wherein the processor is further configured to compute a plurality of correlation values based on the reference signal as received and the reference signal as transmitted.
5. The wireless device of claim 4 , wherein the processor is further configured to compare each of the computed correlation values to a threshold correlation value.
6. The wireless device of claim 4 , wherein the processor is further configured to generate at least one relative phase shift based upon the plurality of correlation values.
7. The wireless device of claim 1 , wherein the processor is further configured to determine a flat fading antenna set comprising two or more antennas of the plurality of antennas according to a received signal power level.
8. The wireless device of claim 1 , wherein the processor is further configured to compute a plurality of correlation values based on the reference signal as received and the reference signal as transmitted.
9. The wireless device of claim 1 , wherein the processor is further configured to determine a diversity reception antenna set of the plurality of antennas.
10. A method for operating a wireless device comprising:
receiving a reference signal via a plurality of antennas;
generating relative phase shift values for at least two antennas of the plurality of antennas based on a phase of the reference signal as received by the at least two antennas;
generating phase shifted versions of a subsequent signal for the at least two antennas according to corresponding generated relative phase shift values; and
combining at least two generated phase shifted versions of the subsequent signal to enable diversity reception.
11. The method of claim 10 , wherein one of the generated relative phase shift values is a reference phase shift value.
12. The method of claim 11 , wherein the reference phase shift value comprises a zero phase shift.
13. The method of claim 10 , further comprising computing a plurality of correlation values based on the reference signal as received and the reference signal as transmitted.
14. The method of claim 13 , further comprising comparing each of the computed correlation values to a threshold correlation value.
15. The method of claim 13 , further comprising generating at least one relative phase shift based upon the plurality of correlation values.
16. The method of claim 10 , further comprising determining a flat fading antenna set comprising two or more antennas of the plurality of antennas according to a received signal power level.
17. A wireless device comprising:
a plurality of antennas configured to receive a reference signal and a subsequent signal; and
a processor configured to:
generate relative phase shift values for at least two antennas of the plurality of antennas based on a phase of the reference signal as received by the at least two antennas;
generate phase shifted versions of the subsequent signal for the at least two antennas according to corresponding generated relative phase shift values; and
combine at least two generated phase shifted versions of the subsequent signal to enable diversity reception.
18. The wireless device of claim 17 , wherein one of the generated relative phase shift values is a reference phase shift value.
19. The wireless device of claim 18 , wherein the reference phase shift value comprises a zero phase shift.
20. The wireless device of claim 17 , wherein the processor is further configured to compute a plurality of correlation values based on the reference signal as received and the reference signal as transmitted.