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Related Concept Videos

Communication01:03

Communication

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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Communication01:28

Communication

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Sharing information, concepts, and emotions to foster mutual understanding is communication. The sender, recipient, and transaction must be considered in this manner. The sender is the person who shares the message, the recipient is the person who receives and understands the message, and the transaction is the method used to deliver the message and the variables that affect the communication's context and surroundings. The nurse-client connection is built on therapeutic communication.
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Neuronal Communication01:28

Neuronal Communication

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Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
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Therapeutic Communication01:30

Therapeutic Communication

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Communication is a lifelong learning process. Through therapeutic communication, nurses can collect relevant assessment data, provide education and counseling, and interact during nursing interventions. Sending and receiving messages occur through verbal and nonverbal communication techniques and can happen separately or simultaneously.
Verbal communication depends on language or a prescribed way of using words so that people can share information effectively. The critical aspects of verbal...
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Light as Energy01:35

Light as Energy

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
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The Wave Nature of Light02:12

The Wave Nature of Light

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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Quadrichromatic LED based mobile phone camera visible light communication.

H Chen, X Z Lai, P Chen

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    This study introduces a novel visible light communication system using quadrichromatic light-emitting diodes (QLEDs) and color ratio modulation (CRM) for mobile cameras. The system achieves a 13.2kbit/s data rate while maintaining illumination compatibility.

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    Area of Science:

    • Optoelectronics
    • Wireless Communication
    • Image Sensors

    Background:

    • Visible light communication (VLC) systems offer high bandwidth potential but face challenges in data rate and illumination compatibility.
    • Existing methods like color intensity modulation (CIM) have limitations in achieving higher data throughput.
    • Mobile phone cameras, equipped with complementary-metal-oxide-semiconductor (CMOS) image sensors, present an opportunity for integrated VLC receivers.

    Purpose of the Study:

    • To propose and evaluate a novel quadrichromatic light-emitting diode (QLED) based visible light communication (VLC) system for mobile phone cameras.
    • To enhance data rates and illumination effects simultaneously using color ratio modulation (CRM).
    • To design a system that meets illumination requirements such as high color rendering index (CRI) and tunable color temperature (CT).

    Main Methods:

    • Development of a color multiple-input multiple-output (CMIMO) channel model based on QLED spectral power distribution (SPD) and CMOS image sensor spectral response.
    • Design and implementation of an optimal 16-color ratio modulation (16-CRM) constellation.
    • Creation of a specific data packet structure to satisfy illumination requirements.
    • Development of a decoding strategy for the receiver.

    Main Results:

    • Achieved a downlink data rate of 13.2 kilobits per second (kbit/s).
    • Demonstrated that the optical signal source is compatible with illumination needs.
    • Validated the effectiveness of the proposed CRM scheme over traditional CIM for improved data rates.

    Conclusions:

    • The proposed QLED-based VLC system with CRM effectively enhances data rates for mobile phone cameras.
    • The system successfully balances high-speed data transmission with illumination compatibility.
    • CRM represents a promising modulation technique for future VLC applications utilizing image sensors.