Photoelectric Integrated Link Monitoring And Optimization Based On Fpga

In different weather conditions, laser lightwave communication systems and millimeter-wave communication systems have different advantages and disadvantages. If we only use one of the communication manners, and if the weather conditions are very complex or usually have significant change, the communication must be restricted, and high-quality, long time continuous communication can not be guaranteed. If these two types of communication manners can combine to work, and automatically adapt to different weather conditions, we can guarantee the quality of communication to ensure a long period of continuous, reliable communication. In recent years, lightwave communication and millimeter-wave communication are the field of communication research focus, but also quite a lot of breakthroughs in these two ways of communication and the usefulness is increasing. However, in the domestic, there is little application and research about combining both these communication systems, this article is mainly research for combining the light wave communication and millimeter-wave communication together.This thesis through the research of the laser light wave and millimeter-wave communication systems, completd some important components of the light wave and millimeter-wave dual-link communication system:links judgment module and high-speed asynchronous multiplexing and demultiplexing module.The design contains the block diagram, codes, simulation to hardware circuit, both of the modules are full-duplex. In the links judgment module, the PN code is used for monitoring the error rate of the channels, the dynamic synchronization method is used, so that we can statistical the channel bit error rate in the synchronization state. The HDB3encoding is used in transmissing the PN code before the signal send out, the decoding is used in the receiving end. In the high-speed asynchronous multiplexing and demultiplexing module,a customize frame structure is used.The achievement according to analyze the research is showed as following:(1) In the light wave and millimeter-wave links judgment module, the function of the module, verilog code, simulation, hardware design and debug have been completed. The function of error monitoring and judgments were verified on the circuit board lastly.(2) In the high-speed asynchronous multiplexing and demultiplexing module, the function of the module, simulation, hardware design and debugging have been completed.(3) In the high-speed asynchronous multiplexing and demultiplexing module, the problem about the differences of the asynchronous sampling clock between the receiving end and the originator has been successfully resolved, so that the data at the originator and the receiving end can be transmited stablely and continuously without interrupt and overflow.(4) In the high-speed asynchronous multiplexing and demultiplexing module, a customize frame structure has been used to ensure that it has the ability of easily increasing a multiplexed signal, or upgrading the performance and modifying itself subsequently.