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文中从提高卫星通信的抗干扰能力出发,基于M-ary扩频、直接序列扩频、跳频及正交频分复用等技术思想,提出了一种正交码时分多子信道扩谱调制(OC-TDMSCSSM)新技术,建立了数学模型,推导了信号格式,给出了实验系统的输出信号频谱,分析了其在加性白高斯噪声信道下误码率性能。理论分析与仿真表明,该方案与DS/FH系统相比,具有良好的误码性能及较强的抗干扰能力。
In this paper, based on the improvement of anti-jamming capability of satellite communication, based on the technical ideas of M-ary spread spectrum, direct sequence spread spectrum, frequency hopping and orthogonal frequency division multiplexing, an orthogonal code time division multiple subchannel spread spectrum modulation (OC-TDMSCSSM), a mathematical model was established, the signal format was derived, the output signal spectrum of the experimental system was given, and its bit error rate performance under additive white Gaussian noise channel was analyzed. Theoretical analysis and simulation show that this scheme has better error performance and stronger anti-interference ability than DS / FH system.