Broadband Link And Resource Allocation Strategy For Wireless Optical Networking

With the development of society,the demand of human for communication have expanded unprecedentedly,and the existing spectrum and bandwidth resources have become rarer and rarer.With the comprehensive popularization of the fifth-generation wireless communication technology,the spectrum resources below 6 GHz that are easy to use have all been allocated.In order to alleviate the pressure of limited spectrum and bandwidth resources,wireless optical communication with abundant spectrum resources including infrared light,ultraviolet light and visible light has gradually become an important research direction of wireless communication.And wireless optical communication,which is a wireless communication technology that don not requires authorization,is rich in spectrum resources,and has strong anti-interference ability,is becoming practical.One of the key technologies from the laboratory to the market is the wireless optical communication networking technology.The research and implementation of wireless optical communication must have the support of hardware devices,while the multi-user networking need the support of access protocols and resource allocation schemes.So this article starts from the foundation of networking:the hardware realization of the wireless optical transmission broadband link.Then we studies the access protocol for wireless optical communication.At last,this paper proposes the dynamic resource allocation scheme suitable for wireless optical communication.First,this article builds a wireless optical communication broadband link system for homogeneous wireless optical networking.The system is based on field programmable gate array(FPGA)to transmit real-time streaming media data with wireless light in the indoor environment.The main structure includes the circuits,optical paths and corresponding FPGA modules of the transmitter and receiver.It mainly solves the problem of bit synchronization and frame synchronization in the communication process.The broadband link realizes wireless optical transmission at a rate of 100Mbps over a distance of 5m,and the bit error rate is lower than the max requirement for communication.The next part designs a time slot-based multi-user access protocol for wireless optical communication networks.The system normalized throughput(bandwidth utilization)of this protocol is significantly improved compared to similar conflict-avoidance protocols,and its normalized throughput can be as high as 0.95 or more.And it can maintain a high bandwidth utilization rate in a complex network with more than 10 users,while the average access delay is kept below 100ms,which basically fulfill the communication requirements and can cope with the large network.Finally,based on the multi-user access scheme and the multi-priority business model,a multi-user network dynamic bandwidth resource allocation scheme for different service types is designed.By setting corresponding priorities for different services,channel bandwidth resources are allocated according to the priority information.Effectively reduce the waste of bandwidth resources,and achieve up to about 95%of bandwidth resource utilization.And it can ensure that the priority business delay is less than 100ms,which basically satisfy its business needs.