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提出了基于现场可编程门阵列(FPGA)技术的混沌直接序列扩频信号盲解调的硬件电路实现方法.设计了混沌直接序列扩频信号发射机与接收机.发射机可产生10种不同的混沌直接序列扩频信号.为方便接收机的硬件电路实现,对无先导卡尔曼滤波混沌拟合盲解调算法进行了简化,在简化模型的基础上设计了接收机硬件结构.提出了一种动态调整偏移因子的新方法,使接收机能实时适应混沌映射的变化.通过高斯白噪声信道及多径信道条件下的盲解调实验,验证了盲解调算法硬件实现的抗噪声与抗多径性能,以及对10种不同的混沌直接序列扩频信号的自适应破译效果.
A hardware circuit realization method of blind demodulation of chaotic direct sequence spread spectrum signal based on Field Programmable Gate Array (FPGA) technology is proposed. Chaotic direct sequence spread spectrum signal transmitter and receiver are designed. The transmitter can generate 10 different Chaos direct sequence spread spectrum signal.In order to facilitate the realization of the hardware circuit of the receiver, the chaotic fitting blind demodulation algorithm without pilot Kalman filter is simplified, and the receiver hardware structure is designed based on the simplified model. The new method of dynamically adjusting the offset factor allows the receiver to adapt to changes in the chaotic map in real time.Through blind demodulation experiments on Gaussian white noise channels and multipath channels, the anti-noise and anti- Path performance, as well as adaptive deciphering of 10 different chaotic direct sequence spread spectrum signals.