Abstract
As an emerging wireless communication technique, visible light communication is experiencing a boom in the global communication field, and the dream of accessing to the Internet with light is fast becoming a reality. The objective of this study was to put forward an efficient and theoretical scheme that is based on generalized spatial modulation to reduce the bit error ratio in indoor short-distance visible light communication. The scheme was implemented while using two steps in parallel: (1) The multi-pulse amplitude and the position modulation signal were generated by combining multi-pulse amplitude modulation with multi-pulse position modulation using transmitted information, and (2) certain light-emitting diodes were activated by employing the idea of generalized spatial modulation to convey the generated multi-pulse amplitude and position modulation optical signals. Furthermore, pulse width modulation was introduced to achieve dimming control in order to improve anti-interference ability to the ambient light of the system. The two steps above involved the information theory of communication. An embedded hardware system, which was based on the C8051F330 microcomputer and included a transmitter and a receiver, was designed to verify the performance of this new scheme. Subsequently, the verifiability experiment was carried out. The results of this experiment demonstrated that the proposed theoretical scheme of transmission was feasible and could lower the bit error ratio (BER) in indoor short-distance visible light communication while guaranteeing indoor light quality.
Highlights
The white light-emitting diode (LED), which is known as the future star of green lighting, is replacing traditional lighting lamps and is widely used in indoor lighting applications
As visible light communication (VLC) has advantages that traditional radio frequency (RF) communication lacks, it is considered to be a mutual enhancement to RF, especially for indoor applications
The main objective of this paper was to put forward an efficient and theoretical scheme that is based on generalized spatial modulation with multi-pulse amplitude and position modulation (GSM-MPAPM) for an indoor VLC system to achieve a lower bit error ratio (BER) and pulse width modulation (PWM)
Summary
The white light-emitting diode (LED), which is known as the future star of green lighting, is replacing traditional lighting lamps and is widely used in indoor lighting applications. A promising characteristic of LEDs is their ability to rapidly flash on or off, which makes it possible to convey information; this is called visible light communication (VLC) and it is receiving global attention [1,2]. As VLC has advantages that traditional radio frequency (RF) communication lacks, it is considered to be a mutual enhancement to RF, especially for indoor applications. VLC has flaws in its current development, such as the limitation of emission power using existing LEDs, which increases the bit error ratio (BER) and lowers the transmission rate of the system. Some solutions were proposed to address this, including the adoption of key technologies or algorithms in existing RF communication
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