MULTI-STAGE AMPLITUDE MODULATION-BASED METHODS, APPARATUSES AND SYSTEMS FOR CODING AND DECODING VISIBLE LIGHT SIGNAL

• US 20160164604A1
• Filed: 01/30/2016
• Published: 06/09/2016
• Est. Priority Date: 07/31/2013
• Status: Active Grant

• Current Assignee: Kuang-Chi Innovative Technology Ltd. (Shenzhen Dapeng Kuang-Chi Lianzhong Technology Ltd. LP)
• Original Assignee: Kuang-Chi Innovative Technology Ltd. (Shenzhen Dapeng Kuang-Chi Lianzhong Technology Ltd. LP)
• Inventors: Liu, Ruopeng, FAN, Linyong
• Granted Patent: US 9,780,877 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 10/116 Visible light communication

Abstract

The present application relates to multi-stage amplitude modulation-based methods, apparatuses, and systems for coding and decoding a visible light signal. The coding method includes the following steps: dividing to-be-transmitted information into multiple information units, where each information unit includes multiple bits; converting the multiple information units into multiple electrical signal units indicated by at least three levels, where an interval indicated by a first level in the at least three levels exists between adjacent electrical signal units, and each electrical signal unit uses a combination of other levels in the at least three levels to represent the multiple bits of a corresponding information unit; combining the electrical signal units to obtain a coded electrical signal; and transmitting the coded electrical signal in a visible light signal form.

Claims

1. A multi-stage amplitude modulation-based method for coding a visible light signal, comprising the following steps:

dividing to-be-transmitted information into multiple information units, each information unit comprises multiple bits;

converting the multiple information units into multiple electrical signal units indicated by at least three levels, an interval indicated by a first level in the at least three levels exists between adjacent electrical signal units, and each electrical signal unit uses a combination of other levels in the at least three levels to represent the multiple bits of a corresponding information unit;

combining the electrical signal units to obtain a coded electrical signal; and

transmitting the coded electrical signal in a visible light signal form.

2. The method according to claim 1, wherein the step of converting the multiple information units into multiple electrical signal units indicated by at least three levels comprises:

determining level combinations of the electrical signal units corresponding to the information units according to a preset correspondence table.

3. The method according to claim 1, further comprising setting a signal end mark to be that a duration of the first level reaches a first threshold.

4. The method according to claim 1, wherein each information unit comprises N bits, wherein N is a natural number, and the information is indicated in binary notation.

5. The method according to claim 1, wherein the step of transmitting the coded electrical signal in a visible light signal form is:

using the coded electrical signal to control a light emitting diode, so that the coded electrical signal is transmitted in the visible light signal form, where the light emitting diode is a lamp or is integrated with an electronic device.

6. The method according to claim 1, wherein the first level is an average value of the at least three levels.

7. The method according to claim 1, wherein the first level is not an average value of the at least three levels, and a beginning of the coded electrical signal is the first level.

8. A multi-stage amplitude modulation-based method for decoding a visible light signal, comprising the following steps:

receiving a visible light signal and converting it into an electrical signal;

when detecting a transition from a first level to other levels, determining that an electrical signal unit begins, and recording a combination of the other levels;

when detecting a transition from the other levels to the first level, determining that the electrical signal unit ends, and starting timing;

when detecting that a duration of the first level reaches a first threshold, determining that the signal ends;

performing decoding to convert each received electrical signal unit into an information unit; and

combining multiple information units into information.

9. The method according to claim 8, wherein the step of performing decoding to convert each received electrical signal unit into an information unit is:

determining, according to a preset correspondence table, an information unit corresponding to the recorded combination of the other levels of the electrical signal unit.

10. The method according to claim 8, wherein before detecting the transition from the first level to the other levels, the method further comprises:

obtaining an average level value by performing low-pass filtering, and using the average level value as the first level.

11. The method according to claim 8, wherein before detecting the transition from the first level to the other levels, the method further comprises:

using a level at a beginning of the electrical signal as the first level.

12. The method according to claim 8, further comprising:

comparing the information with preset information, and if the information matches the preset information, using the information to control a controlled device.

13. The method according to claim 12, wherein that the information matches the preset information comprises that the information is the same as or corresponds to the preset information.

14. A multi-stage amplitude modulation-based apparatus for coding and decoding a visible light signal, the multi-stage amplitude modulation-based apparatus for coding a visible light signal comprises:

a module configured to divide to-be-transmitted information into multiple information units, each information unit comprises multiple bits;

a module configured to convert the multiple information units into multiple electrical signal units indicated by at least three levels, wherein an interval indicated by a first level in the at least three levels exists between adjacent electrical signal units, and each electrical signal unit uses a combination of other levels in the at least three levels to represent the multiple bits of a corresponding information unit;

a module configured to combine the electrical signal units to obtain a coded electrical signal; and

a module configured to transmit the coded electrical signal in a visible light signal form,

the multi-stage amplitude modulation-based apparatus for decoding a visible light signal comprises;

a module configured to receive a visible light signal and convert it into an electrical signal;

a module configured to determine, when a transition from a first level to other levels is detected, that an electrical signal unit begins, and record a combination of the other levels;

a module configured to determine, when a transition from the other levels to the first level is detected, that the electrical signal unit ends, and start timing;

a module configured to determine, when it is detected that a duration of the first level reaches a first threshold, that the signal ends;

a module configured to perform decoding to convert each received electrical signal unit into an information unit; and

a module configured to combine multiple information units into information.

15. The apparatus according to claim 14, wherein the module configured to convert the multiple information units into multiple electrical signal units indicated by at least three levels determines, according to a preset correspondence table, level combinations of the electrical signal units corresponding to the information units.

16. The apparatus according to claim 14, further comprising a module configured to set a signal end mark to be that a duration of the first level reaches a first threshold.

17. The apparatus according to claim 14, wherein the module configured to transmit the coded electrical signal in a visible light signal form uses the coded electrical signal to control a light emitting diode, so that the coded electrical signal is transmitted in the visible light signal form, wherein the light emitting diode is a lamp or is integrated with an electronic device.

18. The apparatus according to claim 14, wherein the first level is an average value of the at least three levels.

19. The apparatus according to claim 14, wherein the first level is not an average value of the at least three levels, and a beginning of the coded electrical signal is the first level.