Systems and methods for wireless power transfer in multipath vehicle environments
Systems and methods for leveraging multipath wireless transmissions for high data rate communication and charging devices within multipath vehicle environments are described. The techniques include deploying a wireless charger, including an array of antennas, within a vehicle interior. The wireless charger may detect an incoming signal from a client device. Each antenna in the array may determine an offset for the received signal, which is then used to tune parameters for each antenna individually. Upon transmission, the resulting signal is directionally biased toward the least lossy pathways between the device and the charger. These pathways avoid passengers and other sources of signal attenuation. Thus, for a given total power envelope, a greater total signal amplitude may be delivered to the device, with reduced exposure to any occupants of the vehicle. Additionally, the interior of the vehicle may be provisioned to help improve multipath focusing of transmissions.
1. A wireless power transmission system configured for deployment in a vehicle, the system comprising:
an antenna array having multiple antennas deployed within an interior of a vehicle; and
control circuitry operatively coupled to the multiple antennas, the control circuitry configured to:
detect, at the multiple antennas of the antenna array, a signal initiated by a device within the vehicle and, received at the multiple antennas over multiple paths;
measure a received signal strength (RSSI) value of the signal received by the multiple antennas over respective paths of the multiple paths;
determine, according to the signal received at the multiple antennas, one or more time or phase offsets for each of the multiple antennas;
tune parameters for each of the multiple antennas based on the one or more time or phase offsets; and
transmit, from at least a portion of the multiple antennas and in accordance with the tuned parameters, a wireless power signal to the device over one or more of the multiple paths for which the RSSI value is determined to exceed a threshold value.
2. The wireless power transmission system of claim 1 , wherein the control circuitry is further configured to transmit, from at least a second portion of the multiple antennas, a data signal in accordance with the tuned parameters.
3. The wireless power transmission system of claim 1 , configured to utilize at least one reflector within the vehicle interior.
4. The wireless power transmission system of claim 3 , wherein the at least one reflector is a metal mesh or screen incorporated into at least one of: a seat, a floor, a ceiling, a floor mat, and a window, of the vehicle.
5. The wireless power transmission system of claim 1 , wherein the control circuitry is further configured to:
send a training transmission including at least one signal pulse; and
receive timing and phase information for signals resulting from the training transmission.
6. The wireless power transmission system of claim 5 , wherein the control circuitry is further configured to:
generate a power transmission schedule based upon the timing and phase information; and
transmit the wireless power signal to the device according to the power transmission schedule.
7. The wireless power transmission system of claim 1 , wherein the control circuitry is further configured to periodically focus wireless power transmissions on one or more fixed locations within the interior, or on an exterior, of the vehicle.
8. The wireless power transmission system of claim 1 , wherein the control circuitry is further configured to:
determine, based on the measured RSSI value, one or more least lossy paths of the one or more of the multiple paths; and
transmit the wireless power signal to the device using the one or more least lossy paths.
9. A vehicle comprising:
a wireless power transmission system deployed within an interior of the vehicle, the wireless power transmission system including:
an antenna array having multiple antennas; and
control circuitry operatively coupled to the multiple antennas, the control circuitry configured to:
detect, at the multiple antennas of the antenna array, a signal initiated by a device within the vehicle and received at the multiple antennas over multiple paths;
measure a received signal strength (RSSI) value of the signal received by the multiple antennas over respective paths of the multiple paths;
determine, according to the signal received at the multiple antennas, one or more time or phase offsets for each of the multiple antennas;
tune parameters for each of the multiple antennas based on the one or more time or phase offsets; and
transmit, from at least a portion of the multiple antennas and in accordance with the tuned parameters, a wireless power signal to the device over one or more of the multiple paths for which the RSSI value is determined to exceed a threshold value.
10. The vehicle of claim 9 further comprising at least one reflector deployed within the vehicle interior.
11. The vehicle of claim 10 , wherein the at least one reflector is a metal mesh or screen.
12. The vehicle of claim 10 , wherein the at least one reflector is incorporated into at least one of: a seat, a floor, a ceiling, a floor mat, and a window, of the vehicle.
13. The vehicle of claim 9 , wherein the wireless power signal comprises at least one of: a radio frequency transmission, an ultrasonic acoustic wave, a photonic signal, and magnetic oscillations.
14. The vehicle of claim 9 , wherein the wireless power transmission system is deployed within one or more of a console, a dashboard, or a ceiling of the vehicle.
15. The vehicle of claim 9 further comprising one or more additional wireless power transmission systems deployed within the interior of the vehicle.
16. The vehicle of claim 9 further comprising one or more fixed wireless power reception elements.
17. The vehicle of claim 9 , wherein the control circuitry is further configured to:
determine, based on the measured RSSI value, one or more least lossy paths of the one or more of the multiple paths; and
transmit the wireless power signal to the device using the one or more least lossy paths.
18. A method of operating a wireless power transmission system deployed within an interior of a vehicle for transmitting wireless energy in a multipath vehicle environment, the method comprising:
detecting, at multiple antennas of an antenna array of the wireless power transmission system, a signal initiated by a device within a vehicle and received over multiple paths within the multipath vehicle environment;
measuring a received signal strength (RSSI) value of the signal received by the multiple antennas over one or more respective paths of the multiple paths;
determining, according to the signal received at the multiple antennas, one or more time or phase offsets of the signal for each of the multiple antennas;
tuning parameters for each of the multiple antennas based on the one or more time or phase offsets; and
transmitting, via at least a portion of the multiple antennas and in accordance with the tuned parameters, a wireless power signal over one or more of the multiple paths for which the RSSI value is determined to exceed a threshold value.
19. The method of claim 18 , further comprising transmitting, from at least a portion of the multiple antennas, a data signal in accordance with the tuned parameters.
20. The method of claim 18 further comprising determining, based on the measured RSSI value, one or more least lossy paths of the one or more of the multiple paths, wherein transmitting the wireless power signal comprises transmitting the wireless power to the device using the one or more least lossy paths.