This erratum is presented to correct the errors in our paper [Opt. Lett.41, 4488 (2016) OPLEDP0146-959210.1364/OL.41.004488].
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- The Letter introduces a secure 3D faster-than-Nyquist non-orthogonal multiple access (3D-FTN-NOMA) scheme utilizing non-orthogonal discrete Fourier transform (NODFT) precoding and chaotic perturbation for enhanced security.
- It highlights the 3D-NOMA signal generation and addresses security issues by implementing chaotic vector technology to perturb user information, achieving a transmission rate of 105.98 Gb/s in practical tests over a 2 km fiber system.
- The scheme leverages NODFT precoding to enable low-order modulation formats to achieve high transmission capacity, resulting in a 5 dB sensitivity gain and effectively tackling dual security vulnerabilities for secure signal transmission.
Faster-than-Nyquist non-orthogonal frequency-division multiplexing (FTN-NOFDM) has been shown to have good robustness against the steep frequency roll-off in a bandwidth-limited optical communication system. Among various FTN-NOFDM techniques, the non-orthogonal matrix precoding (NOM-p) based FTN has relatively high compatibility, which can easily utilize the existing advanced digital signal processing (DSP) techniques in the conventional OFDM. In this work, we propose what we believe to be a novel FTN-NOFDM scheme with adaptive multi-band modulation.
View Article and Find Full Text PDFCapacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling.
Sci Rep
June 2017
State Key Laboratory of Information Photonics and Optical Communications, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications (BUPT), Beijing, 100876, China.
Faster-than-Nyquist (FTN) signal achieves higher spectral efficiency and capacity compared to Nyquist signal due to its smaller pulse interval or narrower subcarrier spacing. Shannon limit typically defines the upper-limit capacity of Nyquist signal. To the best of our knowledge, the mathematical expression for the capacity limit of FTN non-orthogonal frequency-division multiplexing (NOFDM) signal is first demonstrated in this paper.
View Article and Find Full Text PDFThis erratum is presented to correct the errors in our paper [Opt. Lett.41, 4488 (2016) OPLEDP0146-959210.
View Article and Find Full Text PDFIn this Letter, we propose, to the best of our knowledge, the first faster-than-Nyquist non-orthogonal frequency-division multiplexing based on fractional Hartley transform (FrHT). Different from the existing NOFDM signal, the real-valued FrHT-based NOFDM signal can be directly applied to an intensity-modulated/direct-detection optical system without upconversion, and it can achieve a transmission rate faster than the Nyquist rate, which is the up limit of orthogonal frequency-division multiplexing. For example, when bandwidth compression factor α is set to 0.
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