PON

Optics express
|July 30, 2025
PubMed
概括

本研究介绍了双混沌加密和一个新的随机交联分区时间分割 (RIPTS) 方案,用于正交时频空间-索引调制 (OTFS-IM) 系统. 这些方法提高了物理层的安全性,并降低了峰值与平均功率比率 (PAPR).

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Discrete-time Fourier transform01:26

Discrete-time Fourier transform

The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
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BIBO stability of continuous and discrete -time systems01:24

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Linear time-invariant Systems01:23

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Time and frequency -Domain Interpretation of Phase-lag Control01:21

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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