RF transceiver with beamforming antenna and methods for use therewith
View Patent ↗An RF transceiver includes a configuration controller that generates a control signal to select a first candidate radiation pattern for a beamforming antenna based on a first plurality of steering weights. An RF transceiver section broadcasts a first beacon transmission with the first candidate radiation pattern, and generates feedback signals to indicate if a first remote station has responded to the first beacon transmission. When the first remote station has responded to the first beacon transmission, the configuration controller stores the first plurality of steering weights used in association with the beacon transmission and generates control signals to the RF transceiver section to use the first candidate radiation pattern when communicating with the first remote station.
1. A radio frequency (RF) transceiver having a plurality of antennas, the RF transceiver comprising:
a configuration controller operable to generate a control signal to select a non-beamformed beacon transmission with a non-beamformed radiation pattern and to select a first candidate radiation pattern for the plurality of antennas that is beamformed based on a first plurality of steering weights; and
an RF transceiver section, coupled to the configuration controller, operable to broadcast a non-beamformed beacon transmission with the non-beamformed radiation pattern and further a first beamformed beacon transmission with the first candidate radiation pattern, to generate feedback signals to indicate if a first remote station has responded to the non-beamformed beacon transmission and the first beamformed beacon transmission;
wherein, when the first remote station has responded to the first beamformed beacon transmission and not the non-beamformed beacon transmission, the configuration controller is further operable to store the first plurality of steering weights used in association with the first beamformed beacon transmission and to generate the control signals to the RF transceiver section to use the first candidate radiation pattern when communicating with the first remote station via non-beacon transmissions that include data packets that are addressed to the first remote station; and
wherein the configuration controller generates the control signal to alternate between the non-beamformed beacon transmission and a selected one of a plurality of different narrow beam radiation patterns including the first candidate radiation pattern.
2. The RF transceiver of claim 1 wherein, when the first remote station has not responded to the first beamformed beacon transmission, the configuration controller is further operable to generate the control signal to select a second candidate radiation pattern for the beamforming antenna based on a second plurality of steering weights; and
wherein the RF transceiver section is further operable to broadcast a second beamformed beacon transmission with the second candidate radiation pattern, and to generate the feedback signals from the RF transceiver to indicate if the first remote station has responded to the second beamformed beacon transmission.
3. The RF transceiver of claim 1 wherein the configuration controller is further operable to generate the control signal to select a second candidate radiation pattern for the plurality of antennas based on a second plurality of steering weights; and
the RF transceiver section is further operable to broadcast a second beamformed beacon transmission via the RF transceiver with the second candidate radiation pattern, and to generate the feedback signals to indicate when a second remote station has responded to the second beamformed beacon transmission and not the non-beamformed beacon transmission.
4. The RF transceiver of claim 3 wherein, when the first remote station has responded to the first beamformed beacon transmission, the configuration controller is further operable to determine a reverse channel estimation to the first remote station based on the communication with the second remote station using the first candidate radiation pattern, and to adjust the first plurality of steering weights and the first candidate radiation pattern based on the reverse channel estimation.
5. The RF transceiver of claim 4 wherein the RF transceiver performs a one-sided channel calibration based on a transmit path and receive path of the RF transceiver as an estimate of characteristics of the first remote station.
6. The RF transceiver of claim 1 wherein the configuration controller generates the control signals to select a plurality of candidate radiation patterns and the RF transceiver section periodically broadcast beamformed beacon transmissions via the plurality of candidate radiation patterns.
7. The RF transceiver of claim 6 wherein the non-beamformed beacon transmission has an omnidirectional radiation pattern.
8. The RF transceiver of claim 1 wherein the first remote station is a non-beamforming capable station that is out of range of the non-beamformed beacon transmission.
9. The RF transceiver of claim 1 wherein the RF transceiver section operates in accordance with an 802.11ac standard.
10. A method for use in conjunction with a radio frequency (RF) transceiver having a plurality of antenna, the method comprising:
generating a control signal to select a non-beamformed beacon transmission with a non-beamformed radiation pattern and to select a first candidate radiation pattern for the plurality of antennas that is beamformed based on a first plurality of steering weights, wherein the control signal is further generated to alternate between the non-beamformed beacon transmission and a selected one of a plurality of different narrow beam radiation patterns including the first candidate radiation pattern;
broadcasting a non-beamformed beacon transmission with a non-beamformed radiation pattern and further a first beamformed beacon transmission with the first candidate radiation pattern;
evaluating feedback signals to indicate if a first remote station has responded to the non-beamformed beacon transmission and the first beamformed beacon transmission;
when the first remote station has responded to the first beamformed beacon transmission and not the non-beamformed beacon transmission:
storing the first plurality of steering weights in association with the first beamformed beacon transmission; and
communicating with the first remote station using the first candidate radiation pattern via non-beacon transmissions that are addressed to the first remote station.
11. The method of claim 10 further comprising:
when the first remote station has not responded to the first beamformed beacon transmission:
generating the control signal to select a second candidate radiation pattern for the plurality of antennas based on a second plurality of steering weights;
broadcasting a second beamformed beacon transmission via the RF transceiver with the second candidate radiation pattern; and
evaluating feedback signals from the RF transceiver to determine whether the first remote station has responded to the second beamformed beacon transmission.
12. The method of claim 10 further comprising:
generating the control signal to select a second candidate radiation pattern for the plurality of antennas based on a second plurality of steering weights;
broadcasting a second beamformed beacon transmission via the RF transceiver with the second candidate radiation pattern; and
evaluating feedback signals from the RF transceiver to determine whether a second remote station has responded to the second beamformed beacon transmission and not the non-beamformed beacon transmission.
13. The method of claim 10 further comprising:
when the first remote station has responded to the first beamformed beacon transmission:
determining a reverse channel estimation to the first remote station based on the communication with the second remote station using the first candidate radiation pattern; and
adjusting the first plurality of steering weights and the first candidate radiation pattern based on the reverse channel estimation.
14. The method of claim 13 further comprising:
performing a one-sided channel calibration based on a transmit path and receive path of the RF transceiver as an estimate of characteristics of the first remote station.
15. The method of claim 10 wherein generating the control signals to select a first candidate first candidate radiation pattern and broadcasting the first beamformed beacon transmission are part of process to periodically broadcast beamformed beacon transmissions via a plurality of candidate radiation patterns.
16. The method of claim 15 wherein the non-beamformed beacon has transmission an omnidirectional radiation pattern.
17. The method of claim 10 wherein the first remote station is a non-beamforming capable station that is out of range of the non-beamformed beacon transmission.
18. The method of claim 10 wherein the plurality of candidate radiation patterns between the non-beamformed beacon transmission and a selected one of a plurality of different narrow beam radiation patterns including the first candidate radiation pattern.
19. The method of claim 10 wherein communicating with the first remote station using the first candidate radiation pattern includes addressing packet transmissions to the first remote station.