Delta-Sigma Digitization and Optical Coherent Transmission of DOCSIS 3.1 Signals in Hybrid Fiber Coax Networks

Wang, Jing; Jia, Zhensheng; Campos, Luis Alberto; Knittle, Curtis

doi:10.5772/intechopen.82522

Cited by 30 publications

(7 citation statements)

References 51 publications

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“…This includes, for example, passive optical networks 28 . Another short-distance lowbandwidth application is hybrid fibre coax systems 29 . The model is in its present form not intended for long-haul or wavelengthdivision-multiplexed systems.…”

Section: Discussionmentioning

confidence: 99%

Regular perturbation on the group-velocity dispersion parameter for nonlinear fibre-optical communications

2020

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Communication using the optical fibre channel can be challenging due to nonlinear effects that arise in the optical propagation. These effects represent physical processes that originate from light propagation in optical fibres. To obtain fundamental understandings of these processes, mathematical models are typically used. These models are based on approximations of the nonlinear Schrödinger equation, the differential equation that governs the propagation in an optical fibre. All available models in the literature are restricted to certain regimes of operation. Here, we present an approximate model for the nonlinear optical fibre channel in the weak-dispersion regime, in a noiseless scenario. The approximation is obtained by applying regular perturbation theory on the group-velocity dispersion parameter of the nonlinear Schrödinger equation. The proposed model is compared with three other models using the normalized square deviation metric and shown to be significantly more accurate for links with high nonlinearities and weak dispersion.

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Section: Discussionmentioning

confidence: 99%

Regular perturbation on the group-velocity dispersion parameter for nonlinear fibre-optical communications

2020

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“…We have demonstrated an SDoF-based distributed antenna system as a possible solution for the fronthaul network deployment for the high-capacity hot-spot scenario of the 5G enhanced mobile broadband (eMBB) service [24]. It is also worth mentioning that sigma-delta modulated signals have higher bit error rate tolerance as evaluated in [25] and [26].…”

Section: A Radio-frequency Signal Over Fiber (Rfof)mentioning

confidence: 97%

Distributed Antenna System Using Sigma-Delta Intermediate-Frequency-Over-Fiber for Frequency Bands Above 24 GHz

Kerrebrouck

et al. 2020

J. Lightwave Technol.

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The fifth generation (5G) cellular network is expected to include the millimeter wave spectrum, to increase base station density, and to employ higher-order multiple-antenna technologies. The centralized radio access network architectures combined with radio-over-fiber (RoF) links can be the key enabler to improve fronthaul networks. The sigma-delta modulated signal over fiber (SDoF) architecture has been proposed as a solution leveraging the benefits of both digitized and analog RoF. This work proposes a novel distributed antenna system using sigma-delta modulated intermediate-frequency signal over fiber (SDIFoF) links. The system has an adequately good optical bitrate efficiency and high flexibility to switch between different carrier frequencies. The SDIFoF link transmits a signal centered at a 2.5 GHz intermediate frequency over a 100 m multi-mode fiber and the signal is up-converted to the radio frequency (24-29 GHz) at the remote radio unit. An average error vector magnitude (EVM) of 6.40 % (-23.88 dB) is achieved over different carrier frequencies when transmitting a 300 MHz-bandwidth 64-QAM OFDM signal. The system performance is demonstrated by a 2×1 multiple-input single-output system transmitting 160 MHzbandwidth 64-QAM OFDM signals centered at 25 GHz. Owing to transmit diversity, an average gain of 1.12 dB in EVM is observed. This work also evaluates the performance degradation caused by asynchronous phase noise between remote radio units. The performance shows that the proposed approach is a competitive solution for the 5G downlink fronthaul network for frequency bands above 24 GHz.

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“…To solve this problem, delta-sigma modulation is proposed, in which the noise transfer function is specifically designed to reduce the quantization noise within the signal bandwidth [23][24][25][26][27][28][29]. The disadvantage is that the delta-sigma modulation requires an ultra-high oversampling rate.…”

Section: Introductionmentioning

confidence: 99%

Noise Shaping Enhanced DMT Signal Transmission Utilizing Low-Resolution DAC

Luo

Bai

et al. 2021

IEEE Photonics J.

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In order to reduce the quantization noise of lowresolution DAC, we study a noise shaping technique that can reshape the white quantization noise to an irregular spectrum, in which the noise in the data subcarrier band is almost transformed into the null subcarrier band. Both in simulation and experiment, we verify the effectiveness of the investigated scheme in 25 GHz 16-QAM/32-QAM/64-QAM DMT transmission systems. The experimental results show that the noise shaping technique can enhance the receiver sensitivity of 4-bit quantized 16-QAM DMT and 5-bit quantized 32-QAM DMT by 4.3 dB and 2.5 dB respectively, at BER of hard decision forward error correction (HD-FEC) threshold (3.8×10 -3 ). In addition, with the aid of noise shaping, the performance of 4-bit quantization 16-QAM DMT system is the same as the 8-bit quantization 16-QAM DMT system at the HD-FEC threshold. The experimental results reveal that the proposed noise shaping scheme is a good solution for high-speed, low-cost short reach intra-DCI with low-resolution DAC in future 6G networks evolved from 5G mobile networks.

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Delta-Sigma Digitization and Optical Coherent Transmission of DOCSIS 3.1 Signals in Hybrid Fiber Coax Networks

Cited by 30 publications

References 51 publications

Regular perturbation on the group-velocity dispersion parameter for nonlinear fibre-optical communications

Regular perturbation on the group-velocity dispersion parameter for nonlinear fibre-optical communications

Distributed Antenna System Using Sigma-Delta Intermediate-Frequency-Over-Fiber for Frequency Bands Above 24 GHz

Noise Shaping Enhanced DMT Signal Transmission Utilizing Low-Resolution DAC

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