The Design And FPGA Implementation Of Wireless Mesh Network Resource Scheduling Based On F-OFDM

Maritime communication systems are generally based on observation of the marine environment.The primary issue in the development of ocean communication systems is the accurate and efficient acquisition of marine environmental data in real time and transmission to the receivers.Therefore,it is of great significance to develop an effective maritime wireless communication system to promote the development of marine science.The research content of this paper comes from the project "Marine Broadband Wireless Communication System" with Yunzhou Intelligent Technology Co.,Ltd.The goal of the project is to develop an efficient maritime wireless communication system with flexible bandwidth allocation,node access capabilities,a wide range of network coverage and efficient bandwidth transmission capabilities.To meet the research goal of the project,the existing wireless mesh network(WMN),which is one of distributed wireless networks,has become our key research direction.WMN has the advantages of high-speed,high-capacity,flexible networking,and strong adaptability.The application of wireless networking technology is a very promising technology.However,there are still some problems in the traditional WMN based on IEEE802.16 that can not meet the project requirements very well.Such as flexible bandwidth allocation capabilities,good system anti-jamming capability,adaptability to users,etc.To solve these problems,this paper proposes a modified WMN based on f-OFDM(filtered-OFDM,f-OFDM)to meet the needs of the project.In this paper,we study on the WMN from the physical layer and the MAC layer.We conducted in-depth research and analysis of the OFDM technology at the physical layer.Based on this,we use a filter bank-based OFDM technology instead of the traditional OFDM technology.The f-OFDM system has a lower out-of-band spectral leakage.The parameters of each sub-band can be determined by the service type requirements.It has more adaptability to users and has good compatibility.At the MAC layer,we have also adjusted the standard frame structure: add a node to the network request slot and remove the scheduling control sub-frame.Increasing the node's network access request time slot can effectively avoid the conflict when multiple nodes enter the network at the same time,and enhance the node's network access flexibility.Changing the scheduling control sub-frames into data sub-frames can better meet the demand for large data volume services in the project.For the scheduling of service data,we propose a resource scheduling method based on interference coordination to ensure the reliability of the service.We use Xilinx ZYNQ-7000 XC7Z045 as our hardware platform to implement the improved WMN.The f-OFDM system in the physical layer is constructed,and the module diagrams of the single-channel units are given.The correctness of the design is verified,and the hardware circuit diagram of the entire system is also given.In the testing of the MAC layer protocol,we mainly test the single-node network access case and multi-node network access case.According to the analysis of the results,we verified that the network access success rate can be effectively incresed by increasing the network access request time slots.At the same time,the test result of the optimization design of the data sub-frame is also given,and the algorithm can be operated in accordance with our design.Finally,we introduce the interference cancellation interface of the application layer.When the sub-band frequency band reliability is low,the interference subtraction operation can be performed to optimize the sub-band frequency band performance.