Research On Key Techniques For ACO-OFDM Indoor Visible Light Communication System

Semiconductor light-emitting diode(LED)as a light source,not only high brightness,long life,high reliability,small size,low energy loss and has good modulation performance,high response sensitivity and many other outstanding features.In recent years,it has been widely used in the fields of full color display,illumination light source and traffic signal indication.Compared with the ordinary light source,LED modulation faster,you can reach megahertz above,so in the field of communications,white LED is often used in short-range optical fiber communication,however,if the LED is used as a signal transmission source,an optical wireless communication system can also be set up.The system real-time data transmission while lighting greatly reduces the communication cost,avoids the electromagnetic pollution,has the advantages of good confidentiality and more Suitable for military,medical,aviation and other special scenes.The combination of lighting and data transmission with white LEDs has driven the development of VLC technology.In recent years,the mainstream of visible light communication system using orthogonal frequency division multiplexing(OFDM)technology to achieve,the technology can effectively resist multipath interference,can make the interference of the signal can still be reliably received,the signal bandwidth efficiency also increased dramatically.ACO-OFDM modulation makes OFDM technology fully suitable for visible light communications.In this paper,we study on the receiving algorithms and the key techniques of peak-to-average ratio of visible light system based on ACO-OFDM,and analyze the specific schemes involved by theoretical analysis and simulation in order to improve the performance of the whole system.In this paper,the principle and model of indoor visible light communication are firstly studied and modeled and simulated.Then the realization principle and performance analysis of ACO-OFDM communication system are studied,then the receiving algorithm in ACO-OFDM communication system is analyzed.A new algorithm is proposed based on the two improved algorithms and the simulation results are given.Finally,we adjust the PAPR of the traditional OFDM system,and study the probability class algorithm suitable for peak-to-average ratio suppression in ACO-OFDM communication system,at the end of the article,a limit class algorithm suitable for ACO-OFDM synthesis is studied and simulated.