Adaptive baud rate in light-based communication

• US 9,628,177 B1
• Filed: 09/30/2015
• Issued: 04/18/2017
• Est. Priority Date: 09/30/2015
• Status: Active Grant

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Breuer, Christian, Aggarwal, Anant, Stout, Barry
• Primary Examiner(s): Leung, Danny
• Application Number:
  US14/870,461
• Publication Number:
  US 20170093491A1
• Time in Patent Office: 566 Days
• CPC Class Codes: H04B 10/07953 Monitoring or measuring OSNR, BER or Q
• CPC Class Codes: H04B 10/114 Indoor or close-range type systems
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04W 28/0215 based on user or device properties, e.g. MTC-capable devices services for machine-to-machine communication [M2M] or machine type communication [MTC] H04W4/70; wireless resource selection or allocation plan definition based on terminal or device properties H04W72/51
• CPC Class Codes: H04W 4/026 using orientation information, e.g. compass

Abstract

Light-based communication (LCom) techniques are disclosed for adaptively adjusting the baud rate of a luminaire to optimize the LCom signal transmitted for an intended receiver device. The adaptive baud rate can be adjusted by a process that includes, for example: determining decoding parameters of the receiver device, the device including a camera for receiving LCom signals, and a display. The process further includes calculating a baud rate suitable for the receiver device based on the decoding parameters, and causing the baud rate to be set at the luminaire. The process may further include at least one of: verifying the baud rate at the receiver device; adjusting the decoding parameters of the receiver device if baud rate cannot be adjusted to meet a current configuration of decoding parameters; and prompting a user to rotate receiver device to improve orientation of the luminaire with respect to a raster direction of the camera.

Claims

1. A method for setting a baud rate for light-based communication (LCom), the method comprising:

determining decoding parameters of a receiving device, the receiving device including a camera for receiving LCom signals, and a display;

calculating a baud rate suitable for the receiving device based on the decoding parameters; and

causing the baud rate to be set at an LCom-enabled luminaire.

2. The method of claim 1, wherein the method is carried out at least in part on the receiving device.

3. The method of claim 1, wherein the receiving device being a mobile computing device.

4. The method of claim 3, wherein the receiving device is a smartphone or tablet computer.

5. The method of claim 1, wherein the decoding parameters include at least one of shutter speed of the camera, frame resolution of the camera, and orientation of the luminaire with respect to a raster direction of the camera.

6. The method of claim 1, wherein determining decoding parameters of a receiving device includes at least one of:

querying a database of known receiving devices to identify relevant decoding parameters; and

accessing a local storage of the receiving device to identify relevant decoding parameters.

7. The method of claim 1, wherein causing the baud rate to be set at an LCom-enabled luminaire comprises passing the baud rate to the luminaire via a radio frequency wireless communication channel.

8. The method of claim 1, further comprising:

measuring and verifying the baud rate at the receiving device.

9. The method of claim 1, further comprising:

adjusting the decoding parameters of the receiving device if baud rate cannot be adjusted to meet a current configuration of decoding parameters.

10. The method of claim 1, further comprising:

determining whether or not an ID being transmitted by the luminaire is decodable at the baud rate; and

in response to the ID being decodable at the given baud rate, continuing to decode LCom signals at the baud rate; and

in response to the ID not being decodable at the given baud rate, calculating a different baud rate.

11. The method of claim 1, further comprising:

monitoring for changes of luminaire in frame; and

prompting a user to rotate the receiving device to improve orientation of the luminaire with respect to a raster direction of the camera.

12. A non-transitory computer readable medium encoded with instructions that, when executed by one or more processors, causes a process to be carried out for setting a baud rate for light-based communication (LCom), the process comprising:

determining decoding parameters of a receiving device, the receiving device including a camera for receiving LCom signals, and a display;

calculating a baud rate suitable for the receiving device based on the decoding parameters; and

causing the baud rate to be set at an LCom-enabled luminaire.

13. The computer readable medium of claim 12, wherein the process is carried out at least in part on the receiving device, and the computer readable medium and one or more processors are included in the receiving device, the receiving device being a mobile computing device.

14. The computer readable medium of claim 12, wherein the decoding parameters include at least one of shutter speed of the camera, frame resolution of the camera, and orientation of the luminaire with respect to a raster direction of the camera.

15. The computer readable medium of claim 12, wherein determining decoding parameters of a receiving device includes at least one of:

querying a database of known receiving devices to identify relevant decoding parameters; and

accessing a local storage of the receiving device to identify relevant decoding parameters.

16. The computer readable medium of claim 12, wherein causing the baud rate to be set at an LCom-enabled luminaire comprises passing the baud rate to the luminaire via a radio frequency wireless communication channel.

17. The computer readable medium of claim 12, the process further comprising:

measuring and verifying the baud rate at the receiving device.

18. The computer readable medium of claim 12, the process further comprising:

adjusting the decoding parameters of the receiving device if baud rate cannot be adjusted to meet a current configuration of decoding parameters.

19. The computer readable medium of claim 12, the process further comprising:

determining whether or not an ID being transmitted by the luminaire is decodable at the baud rate; and

in response to the ID being decodable at the given baud rate, continuing to decode LCom signals at the baud rate; and

in response to the ID not being decodable at the given baud rate, calculating a different baud rate.

20. The computer readable medium of claim 12, further comprising:

monitoring for changes of luminaire in frame; and

prompting a user to rotate the receiving device to improve orientation of the luminaire with respect to a raster direction of the camera.