The Experts below are selected from a list of 5307 Experts worldwide ranked by ideXlab platform
Junjie Zhang - One of the best experts on this subject based on the ideXlab platform.
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High-Precision and Low-Complexity Symbol Synchronization Algorithm Based on Dual-Threshold Amplitude Decision for Real-Time IMDD OFDM-PON
IEEE Photonics Journal, 2019Co-Authors: Junjie Peng, You Sun, Haoshuo Chen, Qianwu Zhang, Junjie ZhangAbstract:We propose a low-complexity and high-precision symbol synchronization algorithm based on dual-threshold amplitude decision for field programmable gate array-based real-time intensity modulation direct detection orthogonal frequency division multiplexing-passive Optical network (OFDM-PON) system. In addition, a new criterion to judge symbol synchronization accuracy is proposed first based on bipolar non-return-to-zero codes in time domain. Experimental results show that 95% synchronization precision rate can be achieved after 25 km standard single-mode fiber transmission with the Received Optical Power as low as –21 dBm. Compared with the previously proposed one threshold symbol synchronization algorithm, the synchronization performance has been greatly improved, which brings a maximum signal bit rate gain of 35% when the Received Optical Power is lower than –16 dBm. Furthermore, it is verified that the proposed algorithm is robust. It has wide transmission range which is applicable for OFDM-PON Optical access networks within 100 km and has good sampling frequency offset (SFO) tolerance, which can cover the SFO up to 500 ppm without any discard on synchronization precision rate. Finally, complexity analysis shows that our algorithm has the lowest computational complexity and hardware resource consumption, which account for only 0.9% of system resources without any multipliers.
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A novel amplitude decision based symbol synchronization method for real-time IMDD-OOFDM systems
2016Co-Authors: Junjie Zhang, Zhen Zhang, Han Dun, Qianwu ZhangAbstract:A novel symbol synchronization method based on amplitude decision for real-time IMDD-OOFDM systems is experimental demonstrated. Synchronization without correlation and multiplication can be achieved within 5 samples error at the Received Optical Power of −20dBm.
Renát Haluška - One of the best experts on this subject based on the ideXlab platform.
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Prediction of Received Optical Power for Switching Hybrid FSO/RF System
Electronics, 2020Co-Authors: Renát Haluška, Peter Šuľaj, Ľuboš Ovseník, Stanislav Marchevský, Jan Papaj, Ľubomír DobošAbstract:This study deals with the problem of fiber-free Optical communication systems—known as free space optics—using Received signal strength identifier (RSSI) prediction analysis for hard switching of Optical fiber-free link to base radio-frequency (RF) link and back. Adverse influences affecting the atmospheric transmission channel significantly impair Optical communications, therefore attention was paid to the practical design, as well as to the implementation of the monitoring device that is used to record and process weather information along a transmission path. The article contains an analysis and methodology of the solution of the high availability of the Optical link. Attention was paid to the technique of hard free space optics (FSO)/RF-switching with regard to the amount of Received Optical Power detected and its relation to the quantities influencing the Optical communication line. For this purpose, selected methods of machine learning were used, which serve to predict the Received Optical Power. The process of analysis of prediction of Received Optical Power is realized by regression models. The study presents the design of the optimal data input matrix model, which forms the basis for the training of the prediction models for estimating the Received Optical Power.
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prediction of Received Optical Power for switching hybrid fso rf system
Electronics, 2020Co-Authors: Renát Haluška, Peter Šuľaj, Ľuboš Ovseník, Stanislav Marchevský, Jan Papaj, ľubomir DobosAbstract:This study deals with the problem of fiber-free Optical communication systems—known as free space optics—using Received signal strength identifier (RSSI) prediction analysis for hard switching of Optical fiber-free link to base radio-frequency (RF) link and back. Adverse influences affecting the atmospheric transmission channel significantly impair Optical communications, therefore attention was paid to the practical design, as well as to the implementation of the monitoring device that is used to record and process weather information along a transmission path. The article contains an analysis and methodology of the solution of the high availability of the Optical link. Attention was paid to the technique of hard free space optics (FSO)/RF-switching with regard to the amount of Received Optical Power detected and its relation to the quantities influencing the Optical communication line. For this purpose, selected methods of machine learning were used, which serve to predict the Received Optical Power. The process of analysis of prediction of Received Optical Power is realized by regression models. The study presents the design of the optimal data input matrix model, which forms the basis for the training of the prediction models for estimating the Received Optical Power.
Qianwu Zhang - One of the best experts on this subject based on the ideXlab platform.
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High-Precision and Low-Complexity Symbol Synchronization Algorithm Based on Dual-Threshold Amplitude Decision for Real-Time IMDD OFDM-PON
IEEE Photonics Journal, 2019Co-Authors: Junjie Peng, You Sun, Haoshuo Chen, Qianwu Zhang, Junjie ZhangAbstract:We propose a low-complexity and high-precision symbol synchronization algorithm based on dual-threshold amplitude decision for field programmable gate array-based real-time intensity modulation direct detection orthogonal frequency division multiplexing-passive Optical network (OFDM-PON) system. In addition, a new criterion to judge symbol synchronization accuracy is proposed first based on bipolar non-return-to-zero codes in time domain. Experimental results show that 95% synchronization precision rate can be achieved after 25 km standard single-mode fiber transmission with the Received Optical Power as low as –21 dBm. Compared with the previously proposed one threshold symbol synchronization algorithm, the synchronization performance has been greatly improved, which brings a maximum signal bit rate gain of 35% when the Received Optical Power is lower than –16 dBm. Furthermore, it is verified that the proposed algorithm is robust. It has wide transmission range which is applicable for OFDM-PON Optical access networks within 100 km and has good sampling frequency offset (SFO) tolerance, which can cover the SFO up to 500 ppm without any discard on synchronization precision rate. Finally, complexity analysis shows that our algorithm has the lowest computational complexity and hardware resource consumption, which account for only 0.9% of system resources without any multipliers.
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A novel amplitude decision based symbol synchronization method for real-time IMDD-OOFDM systems
2016Co-Authors: Junjie Zhang, Zhen Zhang, Han Dun, Qianwu ZhangAbstract:A novel symbol synchronization method based on amplitude decision for real-time IMDD-OOFDM systems is experimental demonstrated. Synchronization without correlation and multiplication can be achieved within 5 samples error at the Received Optical Power of −20dBm.
Yingxiong Song - One of the best experts on this subject based on the ideXlab platform.
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Single Subcarrier Gold Sequences Modulated Timing Synchronization for Upstream OFDMA-PON
IEEE Photonics Journal, 2017Co-Authors: Xizhen Peng, Jian Chen, Yingxiong SongAbstract:In this paper, we propose a timing synchronization scheme based on Gold sequences modulated on a single subcarrier for the orthogonal frequency-division multiple access passive Optical network (OFDMA-PON). The intensity-modulation and direct-detection real-time experimental demonstrations are carried out over 25-km standard SMF, the performance of the synchronization is investigated by using two Optical network units (ONUs) and one Optical line terminal based on field-programmable gate array. The results show that the accurate timing symbol synchronization can be achieved at Received Optical Power as low as −21 dBm on the condition of sampling frequency offset range from 0 to 70 ppm between two ONUs. The measured bit error rate is below the forward error correction threshold for both ONUs at Received Optical Power of −18 dBm.
Ľubomír Doboš - One of the best experts on this subject based on the ideXlab platform.
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Prediction of Received Optical Power for Switching Hybrid FSO/RF System
Electronics, 2020Co-Authors: Renát Haluška, Peter Šuľaj, Ľuboš Ovseník, Stanislav Marchevský, Jan Papaj, Ľubomír DobošAbstract:This study deals with the problem of fiber-free Optical communication systems—known as free space optics—using Received signal strength identifier (RSSI) prediction analysis for hard switching of Optical fiber-free link to base radio-frequency (RF) link and back. Adverse influences affecting the atmospheric transmission channel significantly impair Optical communications, therefore attention was paid to the practical design, as well as to the implementation of the monitoring device that is used to record and process weather information along a transmission path. The article contains an analysis and methodology of the solution of the high availability of the Optical link. Attention was paid to the technique of hard free space optics (FSO)/RF-switching with regard to the amount of Received Optical Power detected and its relation to the quantities influencing the Optical communication line. For this purpose, selected methods of machine learning were used, which serve to predict the Received Optical Power. The process of analysis of prediction of Received Optical Power is realized by regression models. The study presents the design of the optimal data input matrix model, which forms the basis for the training of the prediction models for estimating the Received Optical Power.
