Ngā hua rapu - phase precoding*

Generation of optical vector millimeter-wave (mm-wave) signal based on Mach–Zehnder intensity modulator with frequency multiplication can reduce bandwidth requirement of optical and electrical components. A phase precoding scheme with constellation optimization is experimentally demonstra...

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We propose and experimentally demonstrate one novel scheme to improve the performance of the vector millimeter-wave (mm-wave) signal generated by intensity modulator based on optical carrier suppression. The phase distribution of the vector mm-wave signal after one square-law photodiode detection be...

Whakaahuatanga katoa

We propose a 64-quadrature-amplitude-modulation (QAM) vector radio-frequency (RF) signal generation and detection via one intensity Mach–Zehnder modulator (MZM) by using optical carrier suppression modulation. In order to obtain an ordinary QAM modulated RF signal after the square-law det...

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In this paper, we experimentally demonstrate a method to generate a frequency-doubling photonic 16-quadrature-amplitude-modulation (16QAM) vector millimeter-wave (mm-wave) signal by using a single phase modulator (PM) with an amplitude and phase precoding technique. The PM is driven by a 2-Gbaud 16Q...

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A novel dual-tone quadrature phase-shift keying (QPSK) optical millimeter (mm)-wave signal generation by frequency nonupling the radio-frequency QPSK signal via an optical phase modulator (PM) without phase precoding is proposed. To enable the generated optical mm-wave signal to resist the fiber chr...

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We propose W-band photonic millimeter-wave (mm-wave) vector signal generation employing a precoding-assisted random frequency tripling scheme enabled by a single phase modulator cascaded with a wavelength selective switch (WSS). The selected two optical subcarriers from the phase modulator output by...

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In this paper, we propose a novel quadrature phase-shift keying (QPSK) vector millimeter-wave (mm-wave) signal generation based on odd times of frequency without precoding. The radio frequency (RF) vector signal generation module is universal for the generation of millimeter-wave signal with any odd...

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In this paper, we investigate a reconfigurable intelligent surface (RIS) assisted downlink orthogonal frequency division multiplexing (OFDM) transmission system. Taking into account hardware constraint, the RIS is considered to be organized into several blocks, and each block of RIS share the same p...

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Cell-free massive multiple-input multiple-output (CF M-MIMO) is one of the most promising technologies for future wireless communication such as 5G and beyond fifth-generation (B5G) networks. It is a type of network technology that uses a massive number of distributed antennas to serve a large numbe...

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In this paper, an electroabsorption modulated laser (EML)-based vector radio-frequency (RF) optical signal generation scheme adopting frequency doubling and precoding is proposed and experimentally investigated. Compared with the expensive, large-size phase modulator, and intensity modulator, the EM...

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Reconfigurable Intelligent Surfaces (RIS) offer a promising solution to enhance wireless communication performance, particularly for 6G networks. This paper proposes a unified joint optimization framework to enhance spectral efficiency in reconfigurable intelligent surface (RIS)-assisted multiple-in...

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High-altitude platforms (HAPs) are critical for 6th generation (6G) networks, particularly in autonomous flying ad-hoc networks (FANETs). However, their extensive coverage areas cause severe co-channel interference (CCI) when overlapping with terrestrial networks (TNs) that share the same frequency...

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