Investigation of a Flexible Downstream Scheme for Sampling Rate and Bandwidth Reduction in Short Reach Communication Systems

Li, Yupeng; Han, Jiawei; Han, Liang; Ju, Cheng

doi:10.1109/access.2020.2982967

Cited by 2 publications

(1 citation statement)

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“…Due to the advantages of large capacity, high spectrum efficiency (SE), transparency to modulation formats, flexible multiple address access, dynamic bandwidth allocation (DBA), the OFDMA-PON has been considered as a good candidate to further support the system capacity increase for next-generation optical access network 2 (NG-PON2) [12]. Recent reports suggest that OFDMA-PON is a promising candidate for the systems beyond NG-PON2 [13][14]. In addition, OFDMA-PON allows different optical network units (ONUs) to transmit upstream data through a set of shared orthogonal low bit rate subcarriers (SCs) in different time slots (TSs) during the transmission polling cycle to meet bandwidth requirements and realize various data rates [10,15].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Subcarrier Assignment in OFDMA-PONs Based on Deep Reinforcement Learning

Zhu

Chen

et al. 2022

IEEE Photonics J.

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Orthogonal Frequency Division Multiplexing Access Passive Optical Networks (OFDMA-PONs), a solution for the next-generation optical access network, allows multiple optical network units (ONUs) to dynamically share subcarriers (SCs) to support efficient bandwidth allocation. In uplink transmission, multiple ONUs can share orthogonal low bit rate SCs to transmit data at different time slots (TSs) during the transmission cycle. In this paper, the dynamic subcarrier allocation (DSA) scheme based on deep reinforcement learning (DRL) is proposed for various ONU bandwidth requests. The novel scheme jointly allocates time slots, subcarriers, and modulation formats in a dynamic and flexible manner. The ONU can save transmit power by using a lower order modulation format while meeting the delay requirement. The simulation part demonstrates how the proposed DRL-based DSA scheme can be adapted to various situations, including 1) variation in the size of ONU bandwidth requests, and 2) variation in the weight of different indicators. The extensive simulation results show that, for the first time, the proposed DRL-based DSA algorithm achieves optimal traffic latency with substantial power saving, compared with the traditional two-dimensional DSA algorithms.

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Section: Introductionmentioning

confidence: 99%

Dynamic Subcarrier Assignment in OFDMA-PONs Based on Deep Reinforcement Learning

Zhu

Chen

et al. 2022

IEEE Photonics J.

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Time-domain uplink synchronization method for a spectral efficient OFDMA-based PON

Nunes

Coelho

Oliveira

et al. 2021

J. Opt. Commun. Netw.

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The feasibility of a time-domain technique, proposed for uplink synchronization of the bandwidth scalable orthogonal frequency division multiple access passive optical network (BS-OFDMA PON), is experimentally demonstrated. The results show that a delay variation of less than 50% of the cyclic prefix is tolerable, relaxing the thin time synchronization required in the uplink of the evaluated architecture. Moreover, we enhance the spectral efficiency of the BS-OFDMA PON by reducing the guard band ( B g ) between the optical carrier and the signal bandwidth, as well as by eliminating the frequency gap ( Δ f G ) between the optical network units. The downlink results demonstrate that Δ f G can be eliminated with negligible performance penalties, and B g can be reduced to almost half the signal bandwidth. Error-free transmissions were achieved after uplink propagation over 45 km of single-mode fibers with received power of ≈ − 16.8 d B m and B g = 450 M H z , with a signal bandwidth of 1 GHz.

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Investigation of a Flexible Downstream Scheme for Sampling Rate and Bandwidth Reduction in Short Reach Communication Systems

Cited by 2 publications

References 25 publications

Dynamic Subcarrier Assignment in OFDMA-PONs Based on Deep Reinforcement Learning

Dynamic Subcarrier Assignment in OFDMA-PONs Based on Deep Reinforcement Learning

Time-domain uplink synchronization method for a spectral efficient OFDMA-based PON

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