高速数据抗干扰传输的设计与仿真

文章提出了一种采用正交循环码的M—ary扩频多载波传输方案（M—ary／OFDM），给出了方案的系统模型、信号格式及关键部分的设计。在发端，每个用户采用正交循环码实现M—ary扩频后经OFDM调制，在收端，经OFDM解凋后利用两个数字匹配滤波器来完成M元扩频信号的解扩，实现了高速数据的抗干扰传输。仿真结果表明，在无人机信道中该方案与传统M—ary／QPSK方案相比，具有较强的抗多径干扰及多普勒频移的能力。

Design and Simulation of High Speed Data Transmission in Distortion Environment

A novel transmission scheme, known as M-ary spread spectrum multicarrier modulation scheme utilizing orthogonal cyclic code, is proposed. System model of the scheme is presented first, and then the signal format and design of critical part are given. In the transmitter, the user realizes M-ary spreading spectrum by adopting orthogonal cyclic codes and implements OFDM modulating, and in the receiver, despreading spectrum is done with only two data matched filter after OFDM demodulation. Simulation results show that the proposed scheme has lower BER, better antimultipath and Doppler frequency shift performance than traditional M-ary/QPSK spread spectrum system under the condition of unmanned aerial vehicle channel.