110 research outputs found
Efficient frequency-domain channel equalisation methods for OFDM/OQAM-PON with intensity modulation and direct detection
No full textIn this study, the authors present efficient frequency-domain channel estimation (CE) methods based on the adjacent subcarriers frequency-domain averaging (ASFA) and minimum mean squared error (MMSE) schemes for the orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) passive optical network (PON) system. The complete channel transmission response for OFDM/OQAM-PON with the chromatic dispersion induced intrinsic imaginary interference effect is systemically derived. Compared with the conventional interference approximation CE method, ASFA and MMSE offer improved receiver sensitivity.Chunmiao Project of Haixi Institutes, Chinese Academy of Sciences; National Science Foundation of China [61601439, 61571128, 61501427]; Fujian Science Foundation [2017J05111]; External Cooperation Program of Chinese Academy of Sciences [121835KYSB20160006]; State Key Laboratory of Advanced Optical Communication Systems and Networks, China; Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R10]SCI(E)ARTICLE6872-8771
Experimental Demonstration of a Smooth Evolution Scheme from Conventional TDM-PON to TDM-OFDM-PON
No full textWe proposed a smooth evolution scheme from conventional TDM-PON to TDM-OFDM-PON. We show by experiment that a TDM-OFDM-PON OLT can support upstream and downstream transmissions for conventional TDM-PON ONUs to achieve cost-effective.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000310362401440&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, Electrical & ElectronicOpticsPhysics, AppliedEICPCI-S(ISTP)
Symmetric 4 x 25-Gb/s DSP-Enhanced TWDM-PON With DSB Modulation and RSOA
No full textWith the ever-increasing bandwidth demand of the end-customers, the 100-Gb/s access solution has attracted more and more attention. In this letter, we propose a symmetric 100-Gb/s digital signal processing-enhanced time wavelength division multiplexed passive optical networ (TWDM-PON) architecture with four pairs of wavelengths. A 4 x 25-Gb/s TWDM-PON is experimentally demonstrated over a 26.7-km fiber using double sideband (DSB) orthogonal frequency division multiplexing (OFDM) modulation. The reflective semiconductor optical amplifier is deployed in the optical network unit (ONU) to enhance the receiver sensitivity of downstream OFDM signals, and DSB single-carrier frequency domain equalization modulation is used for upstream transmission to reduce the complexity and cost of the ONU.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000343882600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, Electrical & ElectronicOpticsPhysics, AppliedSCI(E)[email protected]; [email protected]; [email protected]; [email protected]
Optical MIMO NOMA-PON based on single carrier transmission and polarization interleaving
No full textWe experimentally demonstrate optical multiple inputs and multiple outputs (MIMO) transmission for non-orthogonal multiple access (NOMA) based passive optical network (PON) using polarization interleaving, which offers a higher system capacity for a larger number of users. The MIMO demultiplexing and the inter-user interference mitigation are realized with efficient channel equalization. The optimum power allocation ratio is about 0.42 in the case of four users
Optical Camera Communications: Concept, Marketing, Implementation, Challenges and Applications
No full textDSP-enhanced TWDM-PON with DSB modulation towards 100-GB/S
No full textNext generation passive optical network (NG-PON), which aims at providing cost-effective solutions to the ever-increasing bandwidth demand of the end-customers with data rate of 100-Gb/s, is attracting more and more attentions. In this paper, a symmetric 100-Gb/s DSP-enhanced TWDM-PON architecture with four pairs of wavelengths is proposed. 4??25-Gb/s TWDM-OFDM-PON is experimentally demonstrated over 26.7 km fiber using double sideband (DSB) modulation. The employment of RSOA is also investigated to enhance the receiver sensitivity. ? 2014 IEEE.EI
Experimental demonstration of bidirectional NOMA-OFDMA visible light communications
No full textWe propose a non-orthogonal multiple access (NOMA) scheme combined with orthogonal frequency division multiplexing access (OFDMA) for visible light communications (VLC), which offers a high throughput, flexible bandwidth allocation and a higher system capacity for a larger number of users. Bidirectional NOMA-OFDMA VLC is experimentally demonstrated. The effects of power allocation and channel estimation on the bit error rate performance are investigated. The experiment results indicate that accurate channel estimation can eliminate the inter-user interference more effectively. The optimum power allocation ratios for uplink and downlink are both about 0.25 in the case of two users
Experimental Demonstration of OFDM/OQAM Transmission for Visible Light Communications
No full textWe propose a modified orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) scheme for visible light communications (VLC). The OFDM/OQAM VLC system can efficiently boost the data rate, and combat multipath induced the inter symbol interference (ISI) and inter carrier interference (ICI). To combat the effect of intrinsic imaginary interference, intrasymbol frequency-domain averaging and minimum mean squared error (MMSE), combined with interference approximation method, are proposed. The experiment results show that the proposed system offers similar bit error rate performance to that of OFDM, while the bit rate is increased by 9% for the elimination of cyclic-prefix and guard band
Efficient frequency-domain channel equalization methods for dual-polarization orthogonal frequency-division multiplexing/offset quadrature amplitude modulation-passive optical network
No full textWe present dual-polarization orthogonal frequency-division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) transmission for passive optical network (PON) with intensity modulation and direct detection, which has high spectral efficiency and high robustness against chromatic dispersion (CD) and polarization mode dispersion (PMD). The frequency-domain optical fiber channel transmission model for dual-polarization OFDM/OQAM-PON with the CD- and PMD-induced intrinsic imaginary interference (IMI) effect is systemically deduced. The intrasymbol frequency-domain averaging (ISFA) and minimum mean-squared error (MMSE) with the full loaded (FL) and half loaded (HL) preamble structures are used to mitigate the IMI effect. Compared with the conventional interference approximation method, the ISFA and MMSE offer improved receiver sensitivity. For channel estimation, the FL method is more effective than the HL method in mitigating the IMI effect and optical noise. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)State Key Laboratory of Advanced Optical Communication Systems and Networks, China; National Natural Science Foundation of China [61601439, 61501427, 61571128]; Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R10]SCI(E)[email protected]
A Power Domain Sparse Code Multiple Access Scheme for Visible Light Communications
No full textWe propose a non-orthogonal multiple access (NOMA) scheme known as power domain sparse code multiple access (PD-SCMA) for visible light communications (VLC), which uses both the power and code domains for multi users signal transmission. The signal model and the transceiver of PD-SCMA VLC are investigated. We show by experimental demonstration that, PD-SCMA is a promising multiple access solution for VLC systems offering higher achievable sum rate compared with other NOMA schemes. PD-SCMA with 2 power domain multiplexed layers offers twice the total data rate compared with SCMA at the cost of reduced transmission distance, which is not a problem for VLC systems as the transmission distance can be increased using higher power light sources, high-gain optical concentrators and advanced receivers
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