Open AccessComparison between balanced and unbalanced precoding technique in high-order QAM vector mm-wave signal generation based on intensity modulator with photonic frequency doubling
Author(s) -
Chaoyi Qin,
Xinying Li,
Nan Chi,
Jianjun Yu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.004399
Subject(s) - quadrature amplitude modulation , precoding , optics , qam , physics , modulation (music) , photonics , phase modulation , pulse amplitude modulation , signal (programming language) , amplitude modulation , amplitude and phase shift keying , bit error rate , electronic engineering , telecommunications , frequency modulation , bandwidth (computing) , computer science , phase noise , mimo , beamforming , engineering , acoustics , detector , channel (broadcasting) , pulse (music) , programming language
We experimentally investigate high-order quadrature-amplitude-modulation (QAM) vector millimeter-wave (mm-wave) signal generation based on intensity modulator (IM) with photonic frequcney doubling and precoding in this paper. In order to obtain an ordinary QAM modulated radio-frequency (RF) signal after the square-law detection of the photodiode, amplitude and phase precoding technique should be employed. In this paper, we experimentally investigate the generation of 1~4 Gbaud vector mm-wave signal with the modulation formats of 8QAM and 16QAM at the carrier frequency of 40 GHz, and study the bit-error-rate (BER) performance of both balanced precoding scheme and unbalanced precoding scheme adopting high-order QAM modulation.