Research on Improved Algorithm of Frame Detection for COFDM High-Definition Wireless Transmission System and FPGA Implementation

Abstract

COFDM is one of the more advanced modulation technologies. COFDM wireless image transmission technology is adopted on high-speed mobile UAVs, which can meet the requirements of long-range aerial photography and monitoring. Frame detection is the first step in receiving data. The accuracy of the detection data directly affects the reliability and robustness of the reception performance. Through the research of traditional energy detection algorithm, a delay correlation algorithm based on 802.11a frame structure is adopted, which overcomes the shortcomings of large energy variation and rapid decrease of threshold under low SNR. It also achieves good frame detection performance and can be implemented on an FPGA. Combined with the simulation results of ISE, the frame detection algorithm is suitable for COFDM high-definition wireless image transmission system.