Design And Achievement Of 16QAM Modulation And Demodulation Applied To VLC

LED wireless optical communication system is the combination of LED environmental friendly and communication quality,. It is a brand new wireless communication system. With the development of society, the LED lights in the city as well as providing faster network, it also promote and support the concept of intelligent society and environmental friendly community; But led optical wireless communication is constrained by the modulation bandwidth, so 16 QAM is used to get a higher communication rate for increasing the bandwidth utilization rate.This paper describes the principle and process of the 16 QAM modulation and demodulation applied to VLC, and uses the corresponding software and hardware to make the modulation and demodulation.The main research works of this paper are:(1) Designing the scheme and simulating the function of LED wireless optical communication system with 16 QAM modulation mode.(2) Using Verilog to describe the corresponding hardware circuit, realize 16 QAM signal modulation and demodulation, and complete the program function on the development board, choosing the direct optical wireless communication channel and analog modulation to build 16 QAM LED optical wireless communication system.(3) Designing the auxiliary circuit of 16 QAM modulation and demodulation system such as, analog digital conversion, digital to analog conversion, emission circuit,receiving circuit and other functions. And setting up the corresponding circuit to experiment the modulation bandwidth of the white light LED.