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Josef A Nossek - One of the best experts on this subject based on the ideXlab platform.

  • reconsidering linear transmit signal processing in 1 bit quantized multi user miso systems
    IEEE Transactions on Wireless Communications, 2019
    Co-Authors: Oliver De Candido, Hela Jedda, Amine Mezghani, Lee A Swindlehurst, Josef A Nossek
    Abstract:

    In this contribution, we investigate a coarsely quantized multi-user multiple-input single-output downlink communication system, where we assume 1-bit digital-to-analog converters at the base station antennas. First, we analyze the achievable sum rate lower-bound using the Bussgang decomposition under new assumptions. In the presence of the non-linear quantization, our analysis indicates the potential merit of reconsidering traditional signal processing techniques in coarsely quantized systems, i.e., reconsidering transmit covariance matrices whose rank is equal to the rank of the channel. Furthermore, in the latter part of this paper, we propose a linear precoder design that achieves the predicted increase in performance compared with a state-of-the-art linear precoder design. Moreover, our linear signal processing algorithm allows for Higher Order Modulation schemes to be employed.

  • reconsidering linear transmit signal processing in 1 bit quantized multi user miso systems
    arXiv: Information Theory, 2018
    Co-Authors: Oliver De Candido, Hela Jedda, Amine Mezghani, Lee A Swindlehurst, Josef A Nossek
    Abstract:

    In this contribution, we investigate a coarsely quantized Multi-User (MU)-Multiple Input Single Output (MISO) downlink communication system, where we assume 1-Bit Digital-to-Analog Converters (DACs) at the Base Station (BS) antennas. First, we analyze the achievable sum rate lower-bound using the Bussgang decomposition. In the presence of the non-linear quanization, our analysis indicates the potential merit of reconsidering traditional signal processing techniques in coarsely quantized systems, i.e., reconsidering transmit covariance matrices whose rank is equal to the rank of the channel. Furthermore, in the second part of this paper, we propose a linear precoder design which achieves the predicted increase in performance compared with a state of the art linear precoder design. Moreover, our linear signal processing algorithm allows for Higher-Order Modulation schemes to be employed.

Mohammad Reza Chitgarha - One of the best experts on this subject based on the ideXlab platform.

  • demonstration of tunable optical generation of Higher Order Modulation formats using nonlinearities and coherent frequency comb
    Optics Letters, 2014
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ahmed Almaiman, Amirhossein Mohajerinariaei, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Joseph D Touch
    Abstract:

    We demonstrate a tunable, optical generation scheme of Higher-Order Modulation formats including pulse amplitude Modulation (PAM) and quadrature amplitude Modulation (QAM). Using this method, 100.4 Gbit/s 16-QAM and 120 Gbit/s 64-QAM were generated from 50.2 and 40 Gbit/s QPSK signals at EVMs of 7.8% and 6.4%, and 60 Gbit/s 8-PAM were generated at an EVM of 8.1% using three 20-Gbit/s BPSK signals. We also demonstrated a successful transmission of 80 Gbit/s 16-QAM through 80 km SMF-28 after compensating with 20 km DCF. All signals were generated, transmitted, and detected with BER below the forward error correction threshold.

  • demonstration of reconfigurable optical generation of Higher Order Modulation formats up to 64 qam using optical nonlinearity
    Optics Letters, 2013
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Zahra Bakhtiari, Alan E Willner
    Abstract:

    We demonstrate a reconfigurable optical transmitter of Higher-Order Modulation formats including pulse-amplitude-Modulation (PAM) signals and quadrature-amplitude-Modulation (QAM) signals. We generated six different Modulation formats by multiplexing 10  Gbit/s on–off-keying (OOK) signals (10 Gbaud binary phase-shift keying, 4-PAM, 8-PAM quadrature phase-shift keying (QPSK), 16-QAM and 16-star-QAM with error-vector magnitudes (EVMs) of 8.1%, 7.5%, 7.8%, 8.2%, 7.2%, and 6.9%, respectively) and 80  Gbit/s 16-QAM with an EVM of 8.5%, as well as 120  Gbit/s 64-QAM with an EVM of 7.1%, using two or three 40  Gbit/s QPSK signals, respectively. We also successfully transmitted the generated 16-QAM signals through a 100 km transmission line with negligible power penalty.

  • demonstration of tunable optical generation of Higher Order Modulation formats using nonlinearities and coherent frequency comb
    Conference on Lasers and Electro-Optics, 2013
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ahmed Almaiman, Amirhossein Mohajerinariaei, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Joseph D Touch
    Abstract:

    We demonstrate the generation of optical 16-QAM and 64-QAM at EVM 6.8% and 6.4% respectively using nonlinearities and coherent frequency comb. We also demonstrated a successful transmission through 80-km SMF-28 after compensating with 20-km DCF with negligible penalty.

Joseph D Touch - One of the best experts on this subject based on the ideXlab platform.

Martin M Fejer - One of the best experts on this subject based on the ideXlab platform.

  • demonstration of tunable optical generation of Higher Order Modulation formats using nonlinearities and coherent frequency comb
    Optics Letters, 2014
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ahmed Almaiman, Amirhossein Mohajerinariaei, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Joseph D Touch
    Abstract:

    We demonstrate a tunable, optical generation scheme of Higher-Order Modulation formats including pulse amplitude Modulation (PAM) and quadrature amplitude Modulation (QAM). Using this method, 100.4 Gbit/s 16-QAM and 120 Gbit/s 64-QAM were generated from 50.2 and 40 Gbit/s QPSK signals at EVMs of 7.8% and 6.4%, and 60 Gbit/s 8-PAM were generated at an EVM of 8.1% using three 20-Gbit/s BPSK signals. We also demonstrated a successful transmission of 80 Gbit/s 16-QAM through 80 km SMF-28 after compensating with 20 km DCF. All signals were generated, transmitted, and detected with BER below the forward error correction threshold.

  • demonstration of reconfigurable optical generation of Higher Order Modulation formats up to 64 qam using optical nonlinearity
    Optics Letters, 2013
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Zahra Bakhtiari, Alan E Willner
    Abstract:

    We demonstrate a reconfigurable optical transmitter of Higher-Order Modulation formats including pulse-amplitude-Modulation (PAM) signals and quadrature-amplitude-Modulation (QAM) signals. We generated six different Modulation formats by multiplexing 10  Gbit/s on–off-keying (OOK) signals (10 Gbaud binary phase-shift keying, 4-PAM, 8-PAM quadrature phase-shift keying (QPSK), 16-QAM and 16-star-QAM with error-vector magnitudes (EVMs) of 8.1%, 7.5%, 7.8%, 8.2%, 7.2%, and 6.9%, respectively) and 80  Gbit/s 16-QAM with an EVM of 8.5%, as well as 120  Gbit/s 64-QAM with an EVM of 7.1%, using two or three 40  Gbit/s QPSK signals, respectively. We also successfully transmitted the generated 16-QAM signals through a 100 km transmission line with negligible power penalty.

  • demonstration of tunable optical generation of Higher Order Modulation formats using nonlinearities and coherent frequency comb
    Conference on Lasers and Electro-Optics, 2013
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ahmed Almaiman, Amirhossein Mohajerinariaei, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Joseph D Touch
    Abstract:

    We demonstrate the generation of optical 16-QAM and 64-QAM at EVM 6.8% and 6.4% respectively using nonlinearities and coherent frequency comb. We also demonstrated a successful transmission through 80-km SMF-28 after compensating with 20-km DCF with negligible penalty.

Morteza Ziyadi - One of the best experts on this subject based on the ideXlab platform.

  • demonstration of tunable optical generation of Higher Order Modulation formats using nonlinearities and coherent frequency comb
    Optics Letters, 2014
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ahmed Almaiman, Amirhossein Mohajerinariaei, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Joseph D Touch
    Abstract:

    We demonstrate a tunable, optical generation scheme of Higher-Order Modulation formats including pulse amplitude Modulation (PAM) and quadrature amplitude Modulation (QAM). Using this method, 100.4 Gbit/s 16-QAM and 120 Gbit/s 64-QAM were generated from 50.2 and 40 Gbit/s QPSK signals at EVMs of 7.8% and 6.4%, and 60 Gbit/s 8-PAM were generated at an EVM of 8.1% using three 20-Gbit/s BPSK signals. We also demonstrated a successful transmission of 80 Gbit/s 16-QAM through 80 km SMF-28 after compensating with 20 km DCF. All signals were generated, transmitted, and detected with BER below the forward error correction threshold.

  • demonstration of reconfigurable optical generation of Higher Order Modulation formats up to 64 qam using optical nonlinearity
    Optics Letters, 2013
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Zahra Bakhtiari, Alan E Willner
    Abstract:

    We demonstrate a reconfigurable optical transmitter of Higher-Order Modulation formats including pulse-amplitude-Modulation (PAM) signals and quadrature-amplitude-Modulation (QAM) signals. We generated six different Modulation formats by multiplexing 10  Gbit/s on–off-keying (OOK) signals (10 Gbaud binary phase-shift keying, 4-PAM, 8-PAM quadrature phase-shift keying (QPSK), 16-QAM and 16-star-QAM with error-vector magnitudes (EVMs) of 8.1%, 7.5%, 7.8%, 8.2%, 7.2%, and 6.9%, respectively) and 80  Gbit/s 16-QAM with an EVM of 8.5%, as well as 120  Gbit/s 64-QAM with an EVM of 7.1%, using two or three 40  Gbit/s QPSK signals, respectively. We also successfully transmitted the generated 16-QAM signals through a 100 km transmission line with negligible power penalty.

  • demonstration of tunable optical generation of Higher Order Modulation formats using nonlinearities and coherent frequency comb
    Conference on Lasers and Electro-Optics, 2013
    Co-Authors: Mohammad Reza Chitgarha, Salman Khaleghi, Morteza Ziyadi, Ahmed Almaiman, Amirhossein Mohajerinariaei, Ori Gerstel, Loukas Paraschis, Carsten Langrock, Martin M Fejer, Joseph D Touch
    Abstract:

    We demonstrate the generation of optical 16-QAM and 64-QAM at EVM 6.8% and 6.4% respectively using nonlinearities and coherent frequency comb. We also demonstrated a successful transmission through 80-km SMF-28 after compensating with 20-km DCF with negligible penalty.