This paper presents a broadband wireless transmission system which is suitable for the multipath channel with Doppler, in order to meet the requirements of the image transmission in the ultra-high-speed mobile application. The characteristics of the low-altitude navigation channel model are studied and analyzed. Based on the Time-Domain Synchronous Orthogonal Frequency Division Multiplexing(TDS-OFDM) technology, the base band transmission system is designed for the multipath channel with Doppler, by properly designing the frame structure, using short Low Density Parity Check(LDPC) code with low code rate and Quadrature Phase Shift Keying(QPSK) modulation, combining with the Information Aided Anti Doppler Offset(IAADO) method and improving the channel estimation and equalization method for the dual PN(Pseudo Noise) frame structure. In the simulation, the proposed method of channel estimation has a gain of 0.1 dB. The transmission rate of the system can reach 3 Mbps by using 10 MHz bandwidth under the 6-path channel with 1kHz Doppler shift and 10 dB Rician factor, and the Bit Error Rate(BER) can be lower than 10-4 at -1.1 dB Signal-to-Noise Ratio(SNR). The system enables an image or video transmission in the ultra-high-speed mobile application.