Transmitting and receiving apparatus and method for light communication, and the light communication system thereof

Patent metadata

Field	Value
Publication number	US-9450671-B2
Application number	US-201213671085-A
Country	US
Kind code	B2
Filing date	Nov 7, 2012
Priority date	Mar 20, 2012
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

According to one exemplary embodiment, a light communication system comprises a transmitting apparatus and a receiving apparatus. The transmitting apparatus generates one or more patterns of light to decide at least one reference area, and transmits signals by emitting light in the at least one reference area decided by the one or more patterns. The receiving apparatus takes measurements fewer than a total amount of pixels over a sensed image to detect the one or more patterns of light, and decides at least one ROI according to one or more detected one or more patterns; then takes all signals of light in the at least one ROI for processing of the light communication, and takes measurements fewer than a total amount of pixels over at least one tracking area for tracking the one or more patterns of light emitted by the transmitting apparatus.

First claim

What is claimed is:

1. A transmitting apparatus for light communication, comprising:
a pattern generation unit configured to generate one or more patterns formed in one or more two-dimensional shapes to decide one or more reference areas;
a light communication (LC) control unit that connects to the pattern generation unit and a transmitter-baseband processing unit that performs baseband operations for wireless communication, the LC control unit selects its input from said transmitter-baseband processing unit in a data transmitting period or from said pattern generation unit in a reference region indication period and the LC control unit generates one or more signals to a driver unit, wherein the LC control unit is separate from the driver unit; and

a light emitting element that connects to the driver unit and that emits light in said one or more patterns or in said one or more reference areas decided by said one or more patterns;
wherein
the one or more references areas decided by said one or more patterns identify one or more positions of one or more light sources of the light emitting element that emit said one or more patterns; and
based on said one or more patterns being detected, a receiving apparatus corresponding to the transmitting apparatus decides least one region-of-interest (ROI) of a sensed image for further processing of a light communication of the LC control unit or tracking said one or more patterns.

2. The apparatus as claimed in claim 1 , wherein said one or more patterns form a time-variant sequence.

3. The apparatus as claimed in claim 1 , wherein said one or more reference areas decided by the one or more patterns is used for transmitting a plurality of signals for light communication.

4. The apparatus as claimed in claim 1 , further comprising a driver unit to drive the light emitting element to emit light.

5. A transmitting method for light communication, comprising:
generating one or more patterns formed in one or more two-dimensional shapes, using a pattern generation unit;
transmitting the one or more patterns formed in one or more two-dimensional shapes for at least one period to decide one or more reference areas, by using a light emitting element that connects to a driver unit;
transmitting data, by using the light emitting element, by emitting light in said one or more reference areas decided by said one or more patterns; and
using a light communication control unit that connects to the pattern generation unit and to a transmitter-baseband processing unit to select said one or more patterns as its input in a reference region indication period, or select its input in a data transmitting period from the transmitter-baseband processing unit that performs a plurality of baseband operations for wireless communication, and to generate one or more signals to the driver unit, wherein the light communication control unit is separate from the driver unit;
wherein
the one or more references areas decided by said one or more patterns identify one or more positions of one or more light sources of the light emitting element that emit said one or more patterns; and
based on said one or more patterns being detected, a receiving method corresponding to the transmitting method decides least one region-of-interest (ROI) of a sensed image for further processing of a light communication or tracking said one or more patterns.

6. The transmitting method as claimed in claim 5 , wherein said light in the one or more reference areas is emitted by an LED array via on-off keying of one of modulation schemes.

7. The transmitting method as claimed in claim 5 , wherein said one or more patterns are formed by turning on and off a single LED periodically.

8. The transmitting method as claimed in claim 5 , wherein said one or more patterns form a time-variant sequence.

9. A light communication method, comprising:
in a transmitting apparatus, using a pattern generation unit to generate one or more patterns of light formed in one or more two-dimensional shapes to decide at least one reference area, and transmitting data by emitting light in the at least one reference area decided by the one or more patterns;
using a light communication control unit that connects to the pattern generation unit and to a transmitter-baseband processing unit to select said one or more patterns as its input in a reference region indication period, or select its input in a data transmitting period from the transmitter-baseband processing unit that performs a plurality of baseband operations for wireless communication, and to generate one or more signals to a driver unit, wherein the light communication control unit is separate from the driver unit;
wherein
the at least one reference area decided by said one or more patterns identifies one or more positions of one or more light sources of a light emitting element that connects to the driver unit and emits said one or more patterns; and
based on said one or more patterns being detected, a receiving apparatus corresponding to the transmitting apparatus decides least one region-of-interest (ROI) of a sensed image for further processing of a light communication or tracking said one or more patterns.

10. The method as claimed in claim 9 , wherein said one or more patterns form a time-variant sequence.

Assignees

• Ind Tech Res Inst

Inventors

• Chen Chia-Pin
• Hsiao Chang-Lung
• Chen Ren-Jr

Classifications

• H04B10/116

  Visible light communication · CPC title

• H04B10/1141 Primary

  One-way transmission · CPC title