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Coherent decoding of visible light communication signals

A visible light communication and signal technology, which is applied in the field of coherent decoding of visible light communication signals, can solve problems affecting receiver demodulation and decoding

Active Publication Date: 2018-01-02
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the distance and location of the receiver from the light source can affect the receiver's ability to properly demodulate and decode data communicated from the light source using the VLC signal
If the receiver is far from the light source, the receiver may only be able to demodulate and decode a part of the VLC signal

Method used

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  • Coherent decoding of visible light communication signals
  • Coherent decoding of visible light communication signals
  • Coherent decoding of visible light communication signals

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Embodiment Construction

[0022] Methods, systems, apparatus, apparatus, computer / processor readable media, and other implementations are described herein for transmitting and receiving data using visible light communications (VLC), including methods for decoding VLC signals comprising : Capture an image of a light source emitting a light modulation signal comprising a time sequence of symbols, e.g., using an image capture unit (e.g., a CMOS image sensor with a rolling shutter) comprising a progressive exposure module / circuit; determine a time domain signal from the captured image; identifying at least one decoded symbol from the time domain signal; and based on the identified at least one decoded symbol determined from the time domain signal and based on a symbol measured between the at least one decoded symbol and an earlier at least one decoded symbol of an earlier captured image At least one codeword is determined from the list of candidate codewords at an interval of time.

[0023] Implementations...

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Abstract

Disclosed are methods, systems, devices, apparatus, computer- / processor- readable media, and other implementations, including a method to decode a visible light communication (VLC) signal by capturingimages of a light source emitting a light modulated signal comprising a temporal sequence of symbols to determine decoded symbols and to further determine at least one codeword from a list of candidate codewords.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit and priority of U.S. Provisional Application No. 62 / 154,012, filed April 28, 2015, and U.S. Non-Provisional Application No. 14 / 832,259, filed August 21, 2015, both applications Both are entitled "COHERENT DECODING OF VISIBLE LIGHT COMMUNICATION (VLC) SIGNALS" and are expressly incorporated herein by reference. Background technique [0003] Visible light communication (VLC) involves transmitting information via modulation of light intensity of a light source, such as modulation of light intensity of one or more light emitting diodes (LEDs). In general, visible light communication works by emitting a modulated visible light signal from a light source such as an LED or a laser diode (LD), and transmitting a modulated visible light signal between a photodetector (PD) or an array of PDs (e.g., complementary metal oxide semiconductor (CMOS) image This is achieved by receiving and processin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079H04B10/116H04N5/353
CPCH04B10/116H04B10/0795H04N25/531
Inventor 艾雷克桑达·乔维西克马哈德维·皮尔赖·沛鲁默尔肯尼斯·法瑞克
Owner QUALCOMM INC