The Experts below are selected from a list of 10575 Experts worldwide ranked by ideXlab platform
M. Jiang - One of the best experts on this subject based on the ideXlab platform.
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Superposed pulse amplitude modulation for visible light communication.
Optics express, 2013Co-Authors: Zhuili Huang, Ruqi Zhang, F. X. Zeng, M. JiangAbstract:We propose and experimentally demonstrate a novel modulation scheme called superposed pulse amplitude modulation (SPAM) which is low-cost, insensitive to non-linearity of light emitting diode (LED). Multiple optical pulses transmit parallelly from different spatial position in the LED array and overlap linearly in free space to realize SPAM. With LED arrangement, the experimental results show that using the modulation we proposed the data rate of 120 Mbit/s with BER 1 × 10−3 can be achieved with an optical blue filter and RC post-equalization.
Michael C Huang - One of the best experts on this subject based on the ideXlab platform.
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high swing pulse amplitude modulation of transmission line links for on chip communication
International Symposium on Circuits and Systems, 2018Co-Authors: Richard Afoakwa, Yong Wang, Michael C HuangAbstract:With ever increasing core count of chip-multiprocessors (CMPs), the network-on-chip (NoC) fabric continues to be an important component for performance and energy. We propose the use of high voltage swing serial links as the backbone NoC. We designed transmitter drivers to deliver a high output swing and enable high speed pulse-amplitude modulation (PAM-4 and PAM-8) transmissions. We show that with careful circuit-level transceiver design, coupled with system level architectural utilization of such links, it is possible to drive up to 8 cm of on-chip transmission line at diverse adaptive modulations. Using such a design, experimental analysis shows an average of 1.4× performance improvement over baseline. The overall energy-delay product improvement is 1.75×.
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ISCAS - High Swing pulse-amplitude modulation of Transmission Line Links for On-Chip Communication
2018 IEEE International Symposium on Circuits and Systems (ISCAS), 2018Co-Authors: Richard Afoakwa, Yong Wang, Michael C HuangAbstract:With ever increasing core count of chip-multiprocessors (CMPs), the network-on-chip (NoC) fabric continues to be an important component for performance and energy. We propose the use of high voltage swing serial links as the backbone NoC. We designed transmitter drivers to deliver a high output swing and enable high speed pulse-amplitude modulation (PAM-4 and PAM-8) transmissions. We show that with careful circuit-level transceiver design, coupled with system level architectural utilization of such links, it is possible to drive up to 8 cm of on-chip transmission line at diverse adaptive modulations. Using such a design, experimental analysis shows an average of 1.4× performance improvement over baseline. The overall energy-delay product improvement is 1.75×.
Zabih Ghassemlooy - One of the best experts on this subject based on the ideXlab platform.
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Filter-less WDM for visible light communications using colored pulse amplitude modulation
Optics letters, 2019Co-Authors: Andrew Burton, Zabih Ghassemlooy, Paul Anthony Haigh, Petr Chvojka, Stanislav ZvanovecAbstract:This Letter demonstrates, for the first time, to the best of our knowledge, a new wavelength-division multiplexing (WDM) scheme for visible light communications using multi-level colored pulse amplitude modulation. Unlike traditional WDM, no optical bandpass filters are required, and only a single optical detector is used. We show that, by transmitting n independent sets of weighted on–off keying non-return-to-zero data on separate wavelengths over a line-of-sight transmission path, the resultant additive symbols can be successfully demodulated. Hence, the data rates can be aggregated for a single user or divided into individual colors for multiple user access schemes. The system is empirically tested for M=4 and 8 using an off-the-shelf red, green, and blue (RGB) chip light-emitting diode (LED). We demonstrate that for M=4, using the R and B chips, a bit error rate (BER) of ≤10−6 can be achieved for each wavelength at bit rates up to 10 Mbps, limited by the LEDs under test. For M=8 using R, G, and B, a BER of ≤10−6 can be achieved for each wavelength at bit rates up to 5 Mbps.
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svm detection for superposed pulse amplitude modulation in visible light communications
Communication Systems Networks and Digital Signal Processing, 2016Co-Authors: Youli Yuan, Min Zhang, Pengfei Luo, Zabih Ghassemlooy, Danshi Wang, Xiongyan Tang, Dahai HanAbstract:A support vector machine (SVM)-based data detection for 8-superposed pulse amplitude modulation in visible light communication is proposed and experimentally demonstrated. In this work, the SVM detector contains three binary classifiers with different classification strategies. And the separating hyperplane of each SVM is constructed by training data. The experiment results show that the SVM detection offers 35% higher data rates when compared with the traditional direct decision method.
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CSNDSP - SVM detection for superposed pulse amplitude modulation in visible light communications
2016 10th International Symposium on Communication Systems Networks and Digital Signal Processing (CSNDSP), 2016Co-Authors: Youli Yuan, Min Zhang, Pengfei Luo, Zabih Ghassemlooy, Danshi Wang, Xiongyan Tang, Dahai HanAbstract:A support vector machine (SVM)-based data detection for 8-superposed pulse amplitude modulation in visible light communication is proposed and experimentally demonstrated. In this work, the SVM detector contains three binary classifiers with different classification strategies. And the separating hyperplane of each SVM is constructed by training data. The experiment results show that the SVM detection offers 35% higher data rates when compared with the traditional direct decision method.
Mohammad Ali Khalighi - One of the best experts on this subject based on the ideXlab platform.
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Silicon-Photomultiplier-Based Underwater Wireless Optical Communication Using pulse-amplitude modulation
IEEE Journal of Oceanic Engineering, 2020Co-Authors: Mohammad Ali Khalighi, Hassan Akhouayri, Steve HranilovicAbstract:Emerging maritime applications arising from the continued growth of the marine economy have an inherent need for high data rate underwater wireless links. Within this context, underwater wireless optical communication is known as a promising technology for data transmission over short-to-medium ranges; the current available technology provides a transmission span of about 100 m. In view of extending the transmission range, silicon photomultipliers (SiPMs) have recently emerged as a photodetection solution offering high receiver (Rx) sensitivity together with operational flexibility. In this paper, we introduce the use of pulse-amplitude modulation (PAM) together with frequency-domain equalization (FDE) at the Rx to boost the communication rate beyond the bandwidth (BW) limitation of the optoelectronic components. For instance, for a link BW limited to 2 MHz and 2-PAM transmission with a target bit-error rate (BER) of $10^{-4}$ , the link becomes nonoperational for data rates higher than $\sim\! \text{8}$ Mbps without equalization, whereas much higher data rates can be attained using FDE, e.g., 20 and 50 Mbps with maximum ranges of 28 and 10 m, respectively, in clear waters for the SensL MicroSB-30020 SiPM and an average transmit optical power of 0.6 W only. Meanwhile, the nonlinear distortion of the SiPM is shown to limit the modulation order and thus the data rate in relatively short ranges. We also propose appropriate processing for PAM modulation and demodulation, given the quantum-noise-limited Rx when using an SiPM. We show that the use of nonbinary PAM is undeniably advantageous for moderate data rates (symbol rate a few MHz higher than the overall link BW) when no channel equalization is performed at the Rx. However, when employing FDE, only for very high data rates (e.g., symbol rate ten times higher than the link BW), where the link frequency response becomes highly frequency selective, the nonbinary PAM becomes practically interesting, outperforming 2-PAM.
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Differential pulse-amplitude modulation Signaling for Free-Space Optical Communications
IET Optoelectronics, 2019Co-Authors: Mohammad Taghi Dabiri, Seyed Mohammad Sajad Sadough, Mohammad Ali KhalighiAbstract:To improve the bandwidth efficiency of free-space optical (FSO) systems and at the same time to reduce the impact of the background noise, we propose a differential M-ary pulse-amplitude modulation (M-PAM) signaling scheme that uses two laser transmitters. We first consider the condition that the receiver perfectly knows the instantaneous channel coefficient and compare the performance of the proposed differential PAM with the conventional PAM signaling and show the improved performance when the background noise level is relatively high. Second, we consider the practical situation where the receiver has to estimate the channel for signal detection. We propose an estimation scheme based on the characteristics of the differential PAM signaling while requiring no pilot symbol transmission. The proposed data-aided channel estimation is performed on a sequence of received PAM symbols. We show that for a sufficiently large observation window, the proposed estimation method allows achieving a performance close to the perfect channel knowledge.
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Differential pulse-amplitude modulation signalling for free-space optical communications
IET Optoelectronics, 2019Co-Authors: Mohammad Taghi Dabiri, Seyed Mohammad Sajad Sadough, Mohammad Ali KhalighiAbstract:To improve the bandwidth efficiency of free-space optical systems and at the same time to reduce the impact of the background noise, a differential M -ary pulse-amplitude modulation ( M -PAM) signalling scheme that uses two laser transmitters is proposed. The authors first consider the condition that the receiver perfectly knows the instantaneous channel coefficient and compare the performance of the proposed differential PAM with the conventional PAM signalling and show the improved performance when the background noise level is relatively high. Second , the practical situation where the receiver has to estimate the channel for signal detection is considered. The authors propose an estimation scheme based on the characteristics of the differential PAM signalling while requiring no pilot symbol transmission. The proposed data-aided channel estimation is performed on a sequence of received PAM symbols. The authors also show that for a sufficiently large observation window, the proposed estimation method allows achieving a performance close to the perfect channel knowledge.
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SiPM-based Underwater Wireless Optical Communication Using pulse-amplitude modulation
IEEE Journal of Oceanic Engineering, 2019Co-Authors: Mohammad Ali Khalighi, Hassan Akhouayri, Steve HranilovicAbstract:Emerging maritime applications arising from the continued growth of the marine economy have an inherent need for high data rate underwater wireless links. Within this context, underwater wireless optical communication is known as a promising technology for data transmission over short-to-medium ranges; the current available technology provides a transmission span of about 100 m. In view of extending the transmission range, silicon photo-multipliers (SiPMs) have recently emerged as a photo-detection solution offering high receiver (Rx) sensitivity together with operational flexibility. In this paper, we introduce the use of pulse amplitude modulation (PAM) together with frequency-domain equalization (FDE) at the Rx to boost the communication rate beyond the bandwidth (BW) limitation of the optoelectronic components. For instance, for a link BW limited to 2 MHz and 2-PAM transmission with a target BER of 10 −4 , the link becomes nonoperational for data rates larger than ∼ 8 Mbps without equalization, whereas much higher data rates can be attained using FDE, e.g., 20 and 50 Mbps with maximum ranges of 28 and 10 m, respectively, in clear waters for the SensL MicroSB-30020 SiPM and an average transmit optical power of 0.6 W only. Meanwhile, the nonlinear distortion of the SiPM is shown to limit the modulation order and thus the data rate in relatively short ranges. We also propose appropriate processing for PAM modulation and demodulation, given the quantum-noise-limited Rx when using an SiPM. We show that the use of non-binary PAM is undeniably advantageous for moderate data-rates (symbol rate a few MHz larger than the overall link BW) when no channel equalization is performed at the Rx. However, when employing FDE, only for very high data rates (e.g., symbol rate ten times larger than the link BW), where the link frequency response becomes highly frequency selective, the non-binary PAM becomes practically interesting, outperforming 2-PAM.
Zhuili Huang - One of the best experts on this subject based on the ideXlab platform.
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Superposed pulse amplitude modulation for visible light communication.
Optics express, 2013Co-Authors: Zhuili Huang, Ruqi Zhang, F. X. Zeng, M. JiangAbstract:We propose and experimentally demonstrate a novel modulation scheme called superposed pulse amplitude modulation (SPAM) which is low-cost, insensitive to non-linearity of light emitting diode (LED). Multiple optical pulses transmit parallelly from different spatial position in the LED array and overlap linearly in free space to realize SPAM. With LED arrangement, the experimental results show that using the modulation we proposed the data rate of 120 Mbit/s with BER 1 × 10−3 can be achieved with an optical blue filter and RC post-equalization.
