Axial ratio and cross-polarization calibration in wireless receiver
View Patent ↗A wireless receiver includes an antenna panel coupled to an H-combined/V-combined generation block, an axial ratio and cross-polarization calibration block to correct for an undesired variation in H-combined and V-combined outputs, and an LHCP/RHCP generation block to produce left-handed circularly polarized (LHCP) and right-handed circularly polarized (RHCP) outputs. The axial ratio and cross-polarization calibration block generates an H-corrected output by summing the H-combined output amplified by a first variable gain amplifier and the V-combined output amplified by a second variable gain amplifier, and a V-corrected output by summing the V-combined output amplified by a third variable gain amplifier and the H-combined output amplified by a fourth variable gain amplifier.
1. A wireless receiver, comprising:
an antenna panel coupled to an H-combined/V-combined generation block;
an H-combined output, corresponding to a plurality of horizontal paths, from said H-combined/V-combined generation block,
wherein said plurality of horizontal paths include a plurality of first elements;
a V-combined output, corresponding to a plurality of vertical paths, from said H-combined/V-combined generation block,
wherein said plurality of vertical paths include a plurality of second elements;
an axial ratio and cross-polarization calibration block to correct for an undesired variation in said H-combined output and said V-combined output, based on a ratio of an H-combined output power of said H-combined output and a V-combined output power of said V-combined output,
wherein one of said plurality of first elements or said plurality of second elements are turned off for determination of said ratio; and
an LHCP/RHCP generation block to produce, a left-handed circularly polarized (LHCP) output and a right-handed circularly polarized (RHCP) output, based on said correction of said H-combined output and said V-combined output.
2. The wireless receiver of claim 1 , wherein said undesired variation is due to a change in a position of said antenna panel.
3. The wireless receiver of claim 2 , wherein said change in said position is a change in an elevation angle of said antenna panel.
4. The wireless receiver of claim 1 , wherein said undesired variation is due to a change in a position of a transmitter providing transmit signals to said wireless receiver.
5. The wireless receiver of claim 1 , wherein said axial ratio and cross-polarization calibration block reduces a bit error rate in said LHCP output and said RHCP output of said wireless receiver.
6. The wireless receiver of claim 1 ,
wherein said wireless receiver is mounted on a vehicle, and
wherein a movement of said vehicle causes a change in a position of said wireless receiver.
7. The wireless receiver of claim 1 , wherein said H-combined/V-combined generation block receives a horizontally-polarized signal and a vertically-polarized signal from each antenna in said antenna panel.
8. The wireless receiver of claim 7 , wherein at least one of said horizontally-polarized signal and said vertically-polarized signal is phase-shifted in said H-combined/V-combined generation block.
9. A method, comprising:
in a wireless receiver:
generating an H-combined output, corresponding to a plurality of horizontal paths, based on signals received from an antenna panel,
wherein said plurality of horizontal paths include a plurality of first elements;
generating a V-combined output, corresponding to a plurality of vertical paths, based on said signals received from said antenna panel,
wherein said plurality of vertical paths include a plurality of second elements;
calibrating, said H-combined output and said V-combined output based on a ratio of a V-combined output power of said V-combined output and an H-combined output power of said H-combined output, to correct for an undesired variation in said H-combined output and V-combined output,
wherein one of said plurality of first elements or said plurality of second elements are turned off for determination of said ratio; and
generating a left-handed circularly polarized (LHCP) output and right-handed circularly polarized (RHCP) output, based on said calibrating said H-combined output and said V-combined output.
10. The method of claim 9 , wherein said calibrating said H-combined output and said V-combined output reduces a bit error rate in said LHCP output and RHCP output of said wireless receiver.
11. The method of claim 9 , wherein said generating said H-combined output and said V-combined output comprises receiving a horizontally-polarized signal and a vertically-polarized signal from each antenna in said antenna panel.
12. The method of claim 11 , wherein at least one of said horizontally-polarized signal and said vertically-polarized signal is phase-shifted.
13. A wireless receiver, comprising:
an antenna panel coupled to an H-combined/V-combined generation block;
corresponding to a plurality of horizontal paths, from said H-combined/V-combined generation block,
wherein said plurality of horizontal paths include a plurality of first elements;
a V-combined output, corresponding to a plurality of vertical paths, from said H-combined/V-combined generation block,
wherein said plurality of vertical paths include a plurality of second elements;
an axial ratio and cross-polarization calibration block to correct for an undesired variation in said H-combined output and said V-combined output, based on a ratio of an H-combined output power of said H-combined output and a V-combined output power of said V-combined output,
wherein one of said plurality of first elements or said plurality of second elements are turned off for determination of said ratio; and
a circularly polarized output based on said correction of said H-combined output and said V-combined output.
14. The wireless receiver of claim 13 , wherein said undesired variation is due to a change in a position of said antenna panel.
15. The wireless receiver of claim 14 , wherein said change in said position is a change in an elevation angle of said antenna panel.
16. The wireless receiver of claim 13 , wherein said undesired variation is due to a change in a position of a transmitter providing transmit signals to said wireless receiver.
17. The wireless receiver of claim 13 , wherein said axial ratio and cross-polarization calibration block reduces a bit error rate in said LHCP output and RHCP output of said wireless receiver.
18. The wireless receiver of claim 13 ,
wherein said wireless receiver is mounted on a vehicle, and
wherein a movement of said vehicle causes a change in a position of said wireless receiver.
19. The wireless receiver of claim 13 , wherein said H-combined/V-combined generation block receives a horizontally-polarized signal and a vertically-polarized signal from each antenna in said antenna panel.
20. The wireless receiver of claim 19 , wherein at least one of said horizontally-polarized signal and said vertically-polarized signal is phase-shifted in said H-combined/V-combined generation block.