Spread spectrum signals with low probability of chip rate detection

D. Reed, M. Wickert
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引用次数: 23

Abstract

Spread spectrum signals are considered which use spreading codes chosen to give a low probability of chip rate detection. Pulse shaping and pseudorandom amplitude weighting are used to defeat the interceptor who uses a nonlinear circuit to generate a tone at the chip rate. It is shown that a combination of these techniques can, ideally, defeat any such circuit. The use of quantized multilevel symbols is shown to give performance approaching that of Gaussian symbols. A four-level symbol set is shown to be able to defeat quadratic and fourth-power circuits.<>
扩频信号具有低概率的芯片速率检测
考虑扩频信号,选用扩频码进行低概率的芯片速率检测。采用脉冲整形和伪随机幅度加权来克服利用非线性电路以芯片速率产生音调的拦截器。研究表明,在理想情况下,这些技术的结合可以击败任何这样的电路。使用量子化的多层符号可以获得接近高斯符号的性能。一个四级符号集被证明能够击败二次和四次方电路
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