In this paper, we investigate multi user chirp spread spectrum with noncoherent detection as a continuation of our work on coherent detection. We derive the analytical bit error ratio (BER) expression for binary chirp spread spectrum (BCSS) in the presence of multiple access interference (MAI) caused by correlation with other user signals because of either asynchronism or Doppler shifts, or both, and validate with simulations. To achieve this we analyze the signal cross correlations, and compare traditional linear chirps with our recently-proposed nonlinear chirps introduced and with other nonlinear chirps from the literature. In doing so we illustrate the superior performance of our new nonlinear chirp designs in these practical conditions, for the noncoherent counterpart.

中文翻译：

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非相干多用户线性调频扩频：多普勒频移和异步的性能

在本文中，我们研究了具有非相干检测的多用户线性调频扩频，作为我们相干检测工作的继续。我们推导出二进制啁啾扩频 (BCSS) 的分析误码率 (BER) 表达式，在多址干扰 (MAI) 的情况下，由于异步或多普勒频移或两者的原因，与其他用户信号相关引起的多址干扰 (MAI)模拟。为了实现这一点，我们分析了信号互相关，并将传统的线性啁啾与我们最近提出的非线性啁啾以及文献中的其他非线性啁啾进行了比较。在这样做时，我们说明了我们的新非线性啁啾设计在这些实际条件下的卓越性能，对于非相干对应物。