Abstract
At present, most indoor visible light communication systems use switch keying, pulse position modulation and digital pulse interval modulation. These three modulation methods cannot effectively overcome the inter-symbol interference caused by the multipath effect in the visible light communication system. Compared with the above three modulation methods, high-order pulse amplitude modulation (Pulse Amplitude Modulation, PAM) transmits more bits in the same symbol, which can further improve the modulation efficiency and the communication rate of the system. At a given data rate, the inter-symbol interference caused by multipath effects can be reduced. Using TMS32C6748 floating-point DSP as the control chip of the optical communication system, an indoor visible light communication system based on high-order PAM is designed and implemented. The communication performance of the system is verified by building an experimental platform. The experimental results show that the communication system has the advantages of low bit error rate, high modulation efficiency, and high reliability, and meets the requirements of high-performance indoor visible light communication systems.
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