DRoF-based optical video re-transmission of commercial RF broadcast signals

Shiina, Ryota; Fujiwara, Toshihito; Taniguchi, Tomohiro; Ikeda, Satoshi

doi:10.1364/jocn.11.000559

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…Digital pre-distortion is presented for laser resonance, improving results in [41]. Apart from DSP approaches, Digitized RoF (DRoF) has also been utilized for nonlinearity mitigation [42][43][44][45].…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental Demonstration and Performance Enhancement of 5G NR Multiband Radio over Fiber System Using Optimized Digital Predistortion

et al. 2021

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This paper presents an experimental realization of multiband 5G new radio (NR) optical front haul (OFH) based radio over fiber (RoF) system using digital predistortion (DPD). A novel magnitude-selective affine (MSA) based DPD method is proposed for the complexity reduction and performance enhancement of RoF link followed by its comparison with the canonical piece wise linearization (CPWL), decomposed vector rotation method (DVR) and generalized memory polynomial (GMP) methods. Similarly, a detailed study is shown followed by the implementation proposal of novel neural network (NN) for DPD followed by its comparison with MSA, CPWL, DVR and GMP methods. In the experimental testbed, 5G NR standard at 20 GHz with 50 MHz bandwidth and flexible-waveform signal at 3 GHz with 20 MHz bandwidth is used to cover enhanced mobile broad band and small cells scenarios. A dual drive Mach Zehnder Modulator having two distinct radio frequency signals modulates a 1310 nm optical carrier using distributed feedback laser for 22 km of standard single mode fiber. The experimental results are presented in terms of adjacent channel power ratio (ACPR), error vector magnitude (EVM), number of estimated coefficients and multiplications. The study aims to identify those novel methods such as MSA DPD are a good candidate to deploy in real time scenarios for DPD in comparison to NN based DPD which have a slightly better performance as compared to the proposed MSA method but has a higher complexity levels. Both, proposed methods, MSA and NN are meeting the 3GPP Release 17 requirements.

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Section: Literature Reviewmentioning

confidence: 99%

Experimental Demonstration and Performance Enhancement of 5G NR Multiband Radio over Fiber System Using Optimized Digital Predistortion

et al. 2021

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“…The DRoF principle is especially advantageous in suppressing various types of nonlinearity in analog RoF systems, as the RF signal is digitized and transmitted in the digital format via the optical fiber. Significant developments have been achieved during the past a number of years in the DRoF scheme [54][55][56]. In Reference [55], an improved nonlinear quantization method has been proposed in the DRoF system transmitting broadcast signal and the transmission rate has been reduced by more than 25% via using 5-bit quantization resolution.…”

Section: Impairment Compensataion Techniques-digital Signal Processing and Drofmentioning

confidence: 99%

“…Significant developments have been achieved during the past a number of years in the DRoF scheme [54][55][56]. In Reference [55], an improved nonlinear quantization method has been proposed in the DRoF system transmitting broadcast signal and the transmission rate has been reduced by more than 25% via using 5-bit quantization resolution. In Reference [56], the transmission rate requirement has also been reduced using an adaptive compression method, where 4-bits quantization resolution has been used.…”

Section: Impairment Compensataion Techniques-digital Signal Processing and Drofmentioning

confidence: 99%

Machine Learning Techniques in Radio-over-Fiber Systems and Networks

Lee

Kandeepan

et al. 2020

Photonics

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The radio-over-fiber (RoF) technology has been widely studied during the past decades to extend the wireless communication coverage by leveraging the low-loss and broad bandwidth advantages of the optical fiber. With the increasing need for wireless communications, using millimeter-waves (mm-wave) in wireless communications has become the recent trend and many attempts have been made to build high-throughput and robust mm-wave RoF systems during the past a few years. Whilst the RoF technology provides many benefits, it suffers from several fundamental limitations due to the analog optical link, including the fiber chromatic dispersion and nonlinear impairments. Various approaches have been proposed to address these limitations. In particular, machine learning (ML) algorithms have attracted intensive research attention as a promising candidate for handling the complicated physical layer impairments in RoF systems, especially the nonlinearity during signal modulation, transmission and detection. In this paper, we review recent advancements in ML techniques for RoF systems, especially those which utilize ML models as physical layer signal processors to mitigate various types of impairments and to improve the system performance. In addition, ML algorithms have also been widely adopted for highly efficient RoF network management and resource allocation, such as the dynamic bandwidth allocation and network fault detection. In this paper, we also review the recent works in these research domains. Finally, several key open questions that need to be addressed in the future and possible solutions of these questions are also discussed.

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“…To solve these problems faced by existing systems, we have proposed a novel optical video re-transmission system that applies the concept of digitized radio-over-fiber (DRoF) [6], [7]. The radio frequency (RF) signal received as a ra-dio wave or an intermediate frequency (IF) signal (yielded by head-end frequency conversion) are converted into digital signals, then framed and optically re-transmitted.…”

Section: Introductionmentioning

confidence: 99%

“…Our system is expected to accommodate, in addition to DTT in the ultra-high frequency (UHF) band, BS/CS for satellite broadcasting in the super-high frequency (SHF) band [6], [7]. In particular, in Japan, 4K/8K ultra-high definition (UHD) BS/CS broadcasting services has been underway since 2018 and is currently in the process of spreading [10].…”

Section: Introductionmentioning

confidence: 99%

DRoF-Based Optical Video Re-Transmission System with Adaptive Combination Compression for Rain Attenuated Satellite Broadcast Signals

Shiina

Fujiwara

Taniguchi

et al. 2022

IEICE Trans. Commun.

Self Cite

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In order to further reduce the transmission rate of multichannel satellite broadcast signals, whose carrier-to-noise ratio (CNR fluctuates due to rainfall attenuation, we propose a novel digitized radio-overfiber (DRoF) -based optical re-transmission system based on adaptive combination compression for ultra-high definition (UHD) broadcasting satellite (BS)/communications satellite (CS) broadcast signals. The proposed system reduces the optical re-transmission rate of BS/CS signals as much as possible while handling input CNR fluctuations. Therefore, the transmission rate of communication signals in time-division multiplexing (TDM) transmission is ensured, and network sharing of communication signals and broadcast signals via passive optical network (PON) is realized.Based on the ITU-R P.618-13 prediction model, an experimental evaluation is performed using estimates of the long-term statistics of attenuation due to rainfall. The attenuation is evaluated as a percentage of the time that long-term re-transmission service is available. It is shown that the proposed system is able to accommodate a wide range of rainfall attenuation and achieve a 99.988% time percentage for the duration of service provision. In order to show the rate reduction effect of the proposed system, the quantization bit reduction effect as a function of the input CNR, which depends on rainfall attenuation, is experimentally confirmed. Experiments show that service operation time of 99.978% can be achieved by 3-bit transmission. This means a 62.5% reduction in transmission rate is realized compared to conventional fixed quantization. Furthermore, the average quantization bit number in our system for service operation times is 3.000, indicating that most service operation times are covered by just 3-bit transmission.

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DRoF-based optical video re-transmission of commercial RF broadcast signals

Cited by 3 publications

References 9 publications

Experimental Demonstration and Performance Enhancement of 5G NR Multiband Radio over Fiber System Using Optimized Digital Predistortion

Experimental Demonstration and Performance Enhancement of 5G NR Multiband Radio over Fiber System Using Optimized Digital Predistortion

Machine Learning Techniques in Radio-over-Fiber Systems and Networks

DRoF-Based Optical Video Re-Transmission System with Adaptive Combination Compression for Rain Attenuated Satellite Broadcast Signals

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