The Experts below are selected from a list of 10461 Experts worldwide ranked by ideXlab platform

Idelfonso Tafur Monroy - One of the best experts on this subject based on the ideXlab platform.

  • 25 gbit s qpsk hybrid fiber wireless transmission in the w band 75 110 ghz with remote Antenna Unit for in building wireless networks
    IEEE Photonics Journal, 2012
    Co-Authors: Xiaodan Pang, Antonio Caballero, Anton Dogadaev, Valeria Arlunno, Lei Deng, Robert Borkowski, Jes S Pedersen, Darko Zibar, Xianbin Yu, Idelfonso Tafur Monroy
    Abstract:

    In this paper, we demonstrate a photonic up-converted 25 Gbit/s fiber-wireless quadrature phase shift-keying (QPSK) data transmission link at the W-band (75-110 GHz). By launching two free-running lasers spaced at 87.5 GHz into a standard single-mode fiber (SSMF) at the central office, a W-band radio-over-fiber (RoF) signal is generated and distributed to the remote Antenna Unit (RAU). One laser carries 12.5 Gbaud optical baseband QPSK data, and the other acts as a carrier frequency generating laser. The two signals are heterodyne mixed at a photodetector in the RAU, and the baseband QPSK signal is transparently up-converted to the W-band. After the wireless transmission, the received signal is first down-converted to an intermediate frequency (IF) at 13.5 GHz at an electrical balanced mixer before being sampled and converted to the digital domain. A digital-signal-processing (DSP)-based receiver is employed for offline digital down-conversion and signal demodulation. We successfully demonstrate a 25 Gbit/s QPSK wireless data transmission link over a 22.8 km SSMF plus up to 2.13 m air distance with a bit-error-rate performance below the 2 × 10-3 forward error correction (FEC) limit. The proposed system may have the potential for the integration of the in-building wireless networks with the fiber access networks, e.g., fiber-to-the-building (FTTB).

  • 25 Gbit/s QPSK Hybrid Fiber-Wireless Transmission in the W-Band (75–110 GHz) With Remote Antenna Unit for In-Building Wireless Networks
    IEEE Photonics Journal, 2012
    Co-Authors: Xiaodan Pang, Antonio Caballero, Anton Dogadaev, Valeria Arlunno, Lei Deng, Robert Borkowski, Jes S Pedersen, Darko Zibar, Idelfonso Tafur Monroy
    Abstract:

    In this paper, we demonstrate a photonic up-converted 25 Gbit/s fiber-wireless quadrature phase shift-keying (QPSK) data transmission link at the W-band (75-110 GHz). By launching two free-running lasers spaced at 87.5 GHz into a standard single-mode fiber (SSMF) at the central office, a W-band radio-over-fiber (RoF) signal is generated and distributed to the remote Antenna Unit (RAU). One laser carries 12.5 Gbaud optical baseband QPSK data, and the other acts as a carrier frequency generating laser. The two signals are heterodyne mixed at a photodetector in the RAU, and the baseband QPSK signal is transparently up-converted to the W-band. After the wireless transmission, the received signal is first down-converted to an intermediate frequency (IF) at 13.5 GHz at an electrical balanced mixer before being sampled and converted to the digital domain. A digital-signal-processing (DSP)-based receiver is employed for offline digital down-conversion and signal demodulation. We successfully demonstrate a 25 Gbit/s QPSK wireless data transmission link over a 22.8 km SSMF plus up to 2.13 m air distance with a bit-error-rate performance below the 2 × 10-3 forward error correction (FEC) limit. The proposed system may have the potential for the integration of the in-building wireless networks with the fiber access networks, e.g., fiber-to-the-building (FTTB).

Adão Silva - One of the best experts on this subject based on the ideXlab platform.

  • GLOBECOM Workshops - Minimum bit-error-rate nonlinear precoding for multi-user distributed Antenna systems
    2011 IEEE GLOBECOM Workshops (GC Wkshps), 2011
    Co-Authors: Daniel Castanheira, Atilio Gameiro, Adão Silva
    Abstract:

    The aim of this manuscript is to propose and evaluate a novel nonlinear precoding scheme for distributed MIMO based systems. We consider a high-speed backhaul network where the remote Antenna Units are transparently linked by optical fiber to a central Unit. In the considered architecture we can assume the knowledge of the data and channel state information of all users, at the central Unit. The precoder design is divided in two phases: first a solution based on minimization of bit-error-rate is computed by assuming that all remote Antenna Units can jointly pool their power, i.e., a total power constraint is imposed instead of a per remote Antenna Unit power constraint; the second phase consists in scaling the obtained transmit signal by a factor η to satisfy the individual per remote Antenna Unit power constraint. Numerical results show that the algorithm achieves significant gains over the linear zero-forcing and minimum mean square error based approaches, with a slight increase in complexity, and that its performance is close to the optimum.

  • Minimum Bit-Error-Rate Nonlinear Precoding For Multi-User Distributed Antenna Systems
    'Institute of Electrical and Electronics Engineers (IEEE)', 1
    Co-Authors: Daniel Castanheira, Adão Silva, Atilio Gameiro
    Abstract:

    The aim of this manuscript is to propose and evaluate a novel nonlinear precoding scheme for distributed MIMO based systems.We consider a high-speed backhaul network where the remote Antenna Units are transparently linked by optical fiber to a central Unit. In the considered architecture we can assume the knowledge of the data and channel state information of all users, at the central Unit. The precoder design is divided in two phases: first a solution based on minimization of bit-error-rate is computed by assuming that all remote Antenna Units can jointly pool their power, i.e., a total power constraint is imposed instead of a per remote Antenna Unit power constraint; the second phase consists in scaling the obtained transmit signal by a factor to satisfy the individual per remote Antenna Unit power constraint. Numerical results show that the algorithm achieves significant gains over the linear zero-forcing and minimum mean square error based approaches, with a slight increase in complexity, and that its performance is close to the optimum.CADWIN - PTDC/EEATEL/099241/2008CROWN - PTDC/EEA-TEL/115828/2009Portuguese Foundation for Science and Technology (FCT

Xiaodan Pang - One of the best experts on this subject based on the ideXlab platform.

  • 25 gbit s qpsk hybrid fiber wireless transmission in the w band 75 110 ghz with remote Antenna Unit for in building wireless networks
    IEEE Photonics Journal, 2012
    Co-Authors: Xiaodan Pang, Antonio Caballero, Anton Dogadaev, Valeria Arlunno, Lei Deng, Robert Borkowski, Jes S Pedersen, Darko Zibar, Xianbin Yu, Idelfonso Tafur Monroy
    Abstract:

    In this paper, we demonstrate a photonic up-converted 25 Gbit/s fiber-wireless quadrature phase shift-keying (QPSK) data transmission link at the W-band (75-110 GHz). By launching two free-running lasers spaced at 87.5 GHz into a standard single-mode fiber (SSMF) at the central office, a W-band radio-over-fiber (RoF) signal is generated and distributed to the remote Antenna Unit (RAU). One laser carries 12.5 Gbaud optical baseband QPSK data, and the other acts as a carrier frequency generating laser. The two signals are heterodyne mixed at a photodetector in the RAU, and the baseband QPSK signal is transparently up-converted to the W-band. After the wireless transmission, the received signal is first down-converted to an intermediate frequency (IF) at 13.5 GHz at an electrical balanced mixer before being sampled and converted to the digital domain. A digital-signal-processing (DSP)-based receiver is employed for offline digital down-conversion and signal demodulation. We successfully demonstrate a 25 Gbit/s QPSK wireless data transmission link over a 22.8 km SSMF plus up to 2.13 m air distance with a bit-error-rate performance below the 2 × 10-3 forward error correction (FEC) limit. The proposed system may have the potential for the integration of the in-building wireless networks with the fiber access networks, e.g., fiber-to-the-building (FTTB).

  • 25 Gbit/s QPSK Hybrid Fiber-Wireless Transmission in the W-Band (75–110 GHz) With Remote Antenna Unit for In-Building Wireless Networks
    IEEE Photonics Journal, 2012
    Co-Authors: Xiaodan Pang, Antonio Caballero, Anton Dogadaev, Valeria Arlunno, Lei Deng, Robert Borkowski, Jes S Pedersen, Darko Zibar, Idelfonso Tafur Monroy
    Abstract:

    In this paper, we demonstrate a photonic up-converted 25 Gbit/s fiber-wireless quadrature phase shift-keying (QPSK) data transmission link at the W-band (75-110 GHz). By launching two free-running lasers spaced at 87.5 GHz into a standard single-mode fiber (SSMF) at the central office, a W-band radio-over-fiber (RoF) signal is generated and distributed to the remote Antenna Unit (RAU). One laser carries 12.5 Gbaud optical baseband QPSK data, and the other acts as a carrier frequency generating laser. The two signals are heterodyne mixed at a photodetector in the RAU, and the baseband QPSK signal is transparently up-converted to the W-band. After the wireless transmission, the received signal is first down-converted to an intermediate frequency (IF) at 13.5 GHz at an electrical balanced mixer before being sampled and converted to the digital domain. A digital-signal-processing (DSP)-based receiver is employed for offline digital down-conversion and signal demodulation. We successfully demonstrate a 25 Gbit/s QPSK wireless data transmission link over a 22.8 km SSMF plus up to 2.13 m air distance with a bit-error-rate performance below the 2 × 10-3 forward error correction (FEC) limit. The proposed system may have the potential for the integration of the in-building wireless networks with the fiber access networks, e.g., fiber-to-the-building (FTTB).

Zhangdui Zhong - One of the best experts on this subject based on the ideXlab platform.

  • VTC Spring - Remote Antenna Unit Selection Assisted Seamless Handover for High-Speed Railway Communications with Distributed Antennas
    2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016
    Co-Authors: Ke Xiong, Zhuyan Zhao, Pingyi Fan, Zhangdui Zhong
    Abstract:

    To attain seamless handover and reduce the handover failure probability for high-speed railway (HSR) systems, this paper proposed a remote Antenna Unit (RAU) selection assisted handover scheme based on two HST Antennas and distributed Antenna system (DAS) cell architecture. The RAU selection is adopted to provide high quality received signals for trains in DAS cells and the two HST Antennas are employed on trains to realize seamless handover. Moreover, to efficiently evaluate the system performance, a new metric termed as handover occurrence probability is define for describing the relation between handover occurrence position and handover failure probability. We derive the expressions of the received signal strength, the handover trigger probability, the handover occurrence probability, the handover failure probability and the communication interruption probability of our proposed methodWe derive the expressions of the received signal strength, the handover trigger probability, the handover occurrence probability, the handover failure probability and the communication interruption probability of our proposed method. Numerical experimental results are provided to compare our proposed scheme with traditional handover scheme and some existing ones. It is shown that, our proposed scheme is able to achieve the lowest handover failure probability and communication interruption probability among all schemes.

Daniel Castanheira - One of the best experts on this subject based on the ideXlab platform.

  • GLOBECOM Workshops - Minimum bit-error-rate nonlinear precoding for multi-user distributed Antenna systems
    2011 IEEE GLOBECOM Workshops (GC Wkshps), 2011
    Co-Authors: Daniel Castanheira, Atilio Gameiro, Adão Silva
    Abstract:

    The aim of this manuscript is to propose and evaluate a novel nonlinear precoding scheme for distributed MIMO based systems. We consider a high-speed backhaul network where the remote Antenna Units are transparently linked by optical fiber to a central Unit. In the considered architecture we can assume the knowledge of the data and channel state information of all users, at the central Unit. The precoder design is divided in two phases: first a solution based on minimization of bit-error-rate is computed by assuming that all remote Antenna Units can jointly pool their power, i.e., a total power constraint is imposed instead of a per remote Antenna Unit power constraint; the second phase consists in scaling the obtained transmit signal by a factor η to satisfy the individual per remote Antenna Unit power constraint. Numerical results show that the algorithm achieves significant gains over the linear zero-forcing and minimum mean square error based approaches, with a slight increase in complexity, and that its performance is close to the optimum.

  • Minimum Bit-Error-Rate Nonlinear Precoding For Multi-User Distributed Antenna Systems
    'Institute of Electrical and Electronics Engineers (IEEE)', 1
    Co-Authors: Daniel Castanheira, Adão Silva, Atilio Gameiro
    Abstract:

    The aim of this manuscript is to propose and evaluate a novel nonlinear precoding scheme for distributed MIMO based systems.We consider a high-speed backhaul network where the remote Antenna Units are transparently linked by optical fiber to a central Unit. In the considered architecture we can assume the knowledge of the data and channel state information of all users, at the central Unit. The precoder design is divided in two phases: first a solution based on minimization of bit-error-rate is computed by assuming that all remote Antenna Units can jointly pool their power, i.e., a total power constraint is imposed instead of a per remote Antenna Unit power constraint; the second phase consists in scaling the obtained transmit signal by a factor to satisfy the individual per remote Antenna Unit power constraint. Numerical results show that the algorithm achieves significant gains over the linear zero-forcing and minimum mean square error based approaches, with a slight increase in complexity, and that its performance is close to the optimum.CADWIN - PTDC/EEATEL/099241/2008CROWN - PTDC/EEA-TEL/115828/2009Portuguese Foundation for Science and Technology (FCT