Research On OFDMA Wireless Transmission System Based On SoC Platform

Orthogonal Frequency Division Multiple Access(OFDMA),as the multiple access method of OFDM Orthogonal Frequency Division Multiplexing,has high spectrum efficiency and link flexibility,and provides high data throughput in the wireless transmission environment,which enables it to Widely used in wireless local area networks.Designing the SoC wireless communication transmission platform,completing the construction of a highly integrated wireless communication transmission system,and improving the transmission efficiency and throughput of the system is the main research focus of this article.This paper designs the overall structure of the wireless transmission system based on the SoC platform.Based on the theoretical analysis of the OFDMA system,the programmable SoC chip XC7Z045 is used as the core control and logic processing to establish the Zynq+AD9361 wireless communication system.Designed and implemented the overall hardware circuit of the wireless transmission system,including the baseband processing unit circuit,radio frequency peripheral circuit,system power supply circuit,and clock circuit design,and completed the transceiver of 2.4GHz and 5GHz frequency signals.And conduct the main research on the baseband of the wireless communication system,and realize the design verification of the codec,modulation and demodulation,and FFT/IFFT part of the OFDMA system.In order to rationally configure and make full use of the resources in the OFDMA system,this article first establishes a system model for OFDMA resource allocation,determines the objective function,allocates subcarriers to users through an adaptive subcarrier allocation algorithm,and creates a fairness principle in the allocation process to ensure Fairness during system transmission.Through the hybrid particle swarm algorithm and genetic algorithm,in the iterative optimization process,the diversity is guaranteed,and the rapid convergence to the optimal value is satisfied at the same time.The optimal solution is obtained to complete the power allocation.The power allocation algorithm finally coordinates the relationship between maximizing throughput and the principle of fairness.Simulation results show that compared with other scheduling algorithms,this algorithm optimizes throughput performance while ensuring user fairness.Finally,a system test environment was built,the system was tested and analyzed,and the basic wireless communication transceiver capabilities of the platform were verified by a spectrum analyzer.The system combines a wireless communication transmission system with an adaptive resource allocation algorithm,and the result shows that it can improve the throughput of the system to a certain extent.