The Mixed Transmission Technology And Performance Analysis In Wireless Optical Communication Relay Double-hop System

Compared with traditional radio frequency(RF)communication,Optical Wireless Communication(OWC)has the advantages of high transmission rate,large modulation bandwidth,good security,rich spectrum resources and no authorization.Therefore OWC has aroused the researcher's widespread attention,and becomes one of the modern wireless communication research focal point.OWC is usually divided into indoor Visible Light Communication(VLC)and Outdoor Free Space Optical(FSO)communication.This paper mainly studies the transmission technology and performance analysis of the integrated Power Line Communication(PLC)and indoor VLC systems,and the transmission technology and performance analysis of the hybrid dual-hop outdoor FSO/RF communication system.The main work of this paper includes the following parts:In Chapter 2,the BER performance of the system is studied for the Multiple Input Multiple Output(MIMO)PLC/VLC system based on monochrome white LED.Binary Phase Shift Keying modulation techniques are adopted to modulate the signals in the PLC and VLC modules of the system,respectively,and MIMO technology is used in the VLC module.In the PLC module,for the PLC reference channel with branch link and branchless link,the system performance is studied in this chapter.The simulation results show that the PLC reference channel without branch link has better performance.In addition,in the above two PLC reference channels,when the system has no PLC impulse noise,the system has a lower bit error rate.Chapter 3 studies the BER performance of the system for RGBA-LED based PLC/VLC systems.The system uses Orthogonal Frequency Division Multiplexing(OFDM)technology in both PLC and VLC modules,and employs the interleaving mapping method to map PLC OFDM signals into VLC.In the VLC module,the received VLC OFDM signal is adjusted using a split,post-shear bias operation to enable transmission through the RGBA-LED.At the receiving end,we use the Direct Detection and the Zero Forcing algorithms to detect the received signal.Finally,we reconstruct the detected received signal to recover the original transmitted signal.The simulation results show that the impulse noise in the PLC channel has a significant impact on system performance.In addition,in the high signal-to-noise ratio region of the high-order modulation scheme,crosstalk in the VLC channel can degrade the BER performance of the system.Chapter 4 studies the system's outage probability for hybrid dual-hop FSO/RF decoding and forwarding relay systems in outdoor wireless optical communication.In this system,the RF link uses the K-distributed channel model,and the FSO link is assumed to adopt the M-distribution model.We derive the closed expression of the Cumulative Distribution Function of the system's end-to-end SNR,and produce the closed expression of the outage probability.Finally,the simulation results verify the correctness of the theoretical derivation.