Orthogonal chirp division multiplexing (OCDM) is a spread spectrum technique that leverages the orthogonality of cyclically shifted linear chirp signals to maximize spectral efficiency. However, since each chirp spans the entire signal band, the only way to control its bandwidth is to alter the sampling rate of the digital-to-analog converter (DAC). This letter shows that the inherent relationship between the discrete Fresnel transform (DFnT) and the discrete Fourier transform (DFT) facilitates a simple method of designing the spectrum of the signal without adding significant complexity. This enables direct implementation of the digital filters proposed in literature for advanced waveforms. Subsequently, simulations corroborate the performance of the proposed method and filtered-OCDM (f-OCDM) in wireless multipath fading channels in comparison with orthogonal frequency division multiplexing (OFDM) with a given spectral mask.

中文翻译：

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正交啁啾分复用传输的频谱设计

正交线性调频分复用 (OCDM) 是一种扩频技术，它利用循环移位线性线性调频信号的正交性来最大化频谱效率。然而，由于每个 chirp 跨越整个信号频带，控制其带宽的唯一方法是改变数模转换器 (DAC) 的采样率。这封信表明，离散菲涅耳变换 (DFnT) 和离散傅立叶变换 (DFT) 之间的内在关系有助于设计信号频谱的简单方法，而不会显着增加复杂性。这可以直接实现文献中提出的用于高级波形的数字滤波器。随后，