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Shalabh Gupta – One of the best experts on this subject based on the ideXlab platform.

  • Demonstration of an LO-less, DSP-free QPSK Receiver for Data Center Interconnects
    arXiv: Signal Processing, 2019
    Co-Authors: Rashmi Kamran, Nandakumar Nambath, Nandish Bharat Thaker, Mehul Anghan, Sarath Manikandan, Rakesh Ashok, Shalabh Gupta
    Abstract:

    We present the first demonstration of a local oscillator (LO)-less digital signsignal processing (DSP)-free coherent receiver for high-capacity short distance optical links. Experimental results with an Analog Domain constant modulous algorithm (CMA)-based equalizer chip for the self-homodyne quadrature phase shift keying (SH-QPSK) system validate the employability of an all-Analog and LO-less receiver for low-power interconnects.

  • WOCC – Demonstration of a polarization diversity based SH-QPSK system with CMA-DFE equalizer
    2017 26th Wireless and Optical Communication Conference (WOCC), 2017
    Co-Authors: Rashmi Kamran, Nandakumar Nambath, Nandish Bharat Thaker, Mehul Anghan, Shalabh Gupta
    Abstract:

    An optimum solution for a low power and low cost coherent optical receiver design can be obtained by a self homodyne (SH) system that uses Analog Domain processing. An SH system eliminates the need of a local oscillator (LO) and a carrier phase recovery (CPR) module at the receiver. Due to the inherent line-width tolerance of SH systems, an expensive laser is not required at the transmitter. In digital processing based receivers, Analog-to-digital converters (ADC) are the dominant source of power and cost; signal processing in the Analog Domain can get rid of the usage of ADCs. Combination of these two approaches can lead to a huge power and cost saving. An SH-QPSK system with a polarization multiplexed carrier is experimentally demonstrated with a 28km standard single mode fiber (SSMF) channel and off-line signal processing at the receiver side. The system does not use any optical amplification and dispersion compensating fiber. A novel Analog Domain constant modulus algorithm-decision feedback equalizer (CMA-DFE) is proposed which is a cascade combination of two different types of equalizers. This proposed scheme gives improvement in the performance over an optimum CMA equalizer, because of the difference of minimum mean square errors (MMSE) of two different cost functions.

  • WOCC – Analog Domain decision feedback equalizer for repeater-less DP-QPSK coherent optical links
    2016 25th Wireless and Optical Communication Conference (WOCC), 2016
    Co-Authors: Mukul Ratwani, Nandakumar Nambath, Rashmi Kamran, Shalabh Gupta
    Abstract:

    Optimization of high speed coherent optical receivers in terms of power consumption and complexity can be achieved by processing received signals in the Analog Domain without converting them into the digital Domain. At a particular data rate an equalizer based on Analog delay cells alone will be limited by the link distance. It is due to the reduction of the overall bandwidth of cascaded delay cells needed to compensate for more dispersion. This issue can be addressed by including digital delay cells in a feedback path which reduces the number of Analog delay cells without compromising the performance of the equalizer. We present a low power Analog Domain decision feedback equalizer for dual polarization-quadrature phase shift keying systems which can be used for a repeater-less distance of up to 80km of non zero dispersion shifted fiber. The proposed equalizer gives a pre forward error correction bit error rate of 10−4 at a received signal to noise ratio of 20 dB.

Nandakumar Nambath – One of the best experts on this subject based on the ideXlab platform.

  • Demonstration of an LO-less, DSP-free QPSK Receiver for Data Center Interconnects
    arXiv: Signal Processing, 2019
    Co-Authors: Rashmi Kamran, Nandakumar Nambath, Nandish Bharat Thaker, Mehul Anghan, Sarath Manikandan, Rakesh Ashok, Shalabh Gupta
    Abstract:

    We present the first demonstration of a local oscillator (LO)-less digital signal processing (DSP)-free coherent receiver for high-capacity short distance optical links. Experimental results with an Analog Domain constant modulous algorithm (CMA)-based equalizer chip for the self-homodyne quadrature phase shift keying (SH-QPSK) system validate the employability of an all-Analog and LO-less receiver for low-power interconnects.

  • WOCC – Demonstration of a polarization diversity based SH-QPSK system with CMA-DFE equalizer
    2017 26th Wireless and Optical Communication Conference (WOCC), 2017
    Co-Authors: Rashmi Kamran, Nandakumar Nambath, Nandish Bharat Thaker, Mehul Anghan, Shalabh Gupta
    Abstract:

    An optimum solution for a low power and low cost coherent optical receiver design can be obtained by a self homodyne (SH) system that uses Analog Domain processing. An SH system eliminates the need of a local oscillator (LO) and a carrier phase recovery (CPR) module at the receiver. Due to the inherent line-width tolerance of SH systems, an expensive laser is not required at the transmitter. In digital processing based receivers, Analog-to-digital converters (ADC) are the dominant source of power and cost; signal processing in the Analog Domain can get rid of the usage of ADCs. Combination of these two approaches can lead to a huge power and cost saving. An SH-QPSK system with a polarization multiplexed carrier is experimentally demonstrated with a 28km standard single mode fiber (SSMF) channel and off-line signal processing at the receiver side. The system does not use any optical amplification and dispersion compensating fiber. A novel Analog Domain constant modulus algorithm-decision feedback equalizer (CMA-DFE) is proposed which is a cascade combination of two different types of equalizers. This proposed scheme gives improvement in the performance over an optimum CMA equalizer, because of the difference of minimum mean square errors (MMSE) of two different cost functions.

  • WOCC – Analog Domain decision feedback equalizer for repeater-less DP-QPSK coherent optical links
    2016 25th Wireless and Optical Communication Conference (WOCC), 2016
    Co-Authors: Mukul Ratwani, Nandakumar Nambath, Rashmi Kamran, Shalabh Gupta
    Abstract:

    Optimization of high speed coherent optical receivers in terms of power consumption and complexity can be achieved by processing received signals in the Analog Domain without converting them into the digital Domain. At a particular data rate an equalizer based on Analog delay cells alone will be limited by the link distance. It is due to the reduction of the overall bandwidth of cascaded delay cells needed to compensate for more dispersion. This issue can be addressed by including digital delay cells in a feedback path which reduces the number of Analog delay cells without compromising the performance of the equalizer. We present a low power Analog Domain decision feedback equalizer for dual polarization-quadrature phase shift keying systems which can be used for a repeater-less distance of up to 80km of non zero dispersion shifted fiber. The proposed equalizer gives a pre forward error correction bit error rate of 10−4 at a received signal to noise ratio of 20 dB.

Sridhar Rajagopal – One of the best experts on this subject based on the ideXlab platform.

  • multimode precoding in millimeter wave mimo transmitters with multiple antenna sub arrays
    Global Communications Conference, 2013
    Co-Authors: Omar El Ayach, Robert W. Heath, Sridhar Rajagopal, Zhouyue Pi
    Abstract:

    Millimeter wave (mmWave) systems must use beamforming to overcome the heavy attenuation at mmWave frequencies and establish high-quality communication links with reasonably high spectral efficiency. When received signal power is sufficiently large and the propagation channel is sufficiently rich, beamforming with multiple data streams, known as precoding, could further increase data rates in mmWave systems. The high cost of digital devices in mmWave systems, however, implies that precoding is predominantly done in the Analog Domain, making mmWave precoding significantly more constrained than traditional multiple-input multiple-output (MIMO) solutions. In this paper, we propose an iterative precoding algorithm for a practical mmWave transmitter architecture in which all precoding is done in the Analog Domain. In addition to precoding, the proposed algorithm allows the mmWave system to adapt the rank of its transmission in response to varying propagation conditions. We present numerical results showing that the proposed multimode precoding algorithm allows systems to achieve large data rates, in some cases approaching channel capacity.

  • GLOBECOM – Multimode precoding in millimeter wave MIMO transmitters with multiple antenna sub-arrays
    2013 IEEE Global Communications Conference (GLOBECOM), 2013
    Co-Authors: Omar El Ayach, Robert W. Heath, Sridhar Rajagopal
    Abstract:

    Millimeter wave (mmWave) systems must use beamforming to overcome the heavy attenuation at mmWave frequencies and establish high-quality communication links with reasonably high spectral efficiency. When received signal power is sufficiently large and the propagation channel is sufficiently rich, beamforming with multiple data streams, known as precoding, could further increase data rates in mmWave systems. The high cost of digital devices in mmWave systems, however, implies that precoding is predominantly done in the Analog Domain, making mmWave precoding significantly more constrained than traditional multiple-input multiple-output (MIMO) solutions. In this paper, we propose an iterative precoding algorithm for a practical mmWave transmitter architecture in which all precoding is done in the Analog Domain. In addition to precoding, the proposed algorithm allows the mmWave system to adapt the rank of its transmission in response to varying propagation conditions. We present numerical results showing that the proposed multimode precoding algorithm allows systems to achieve large data rates, in some cases approaching channel capacity.

Omar El Ayach – One of the best experts on this subject based on the ideXlab platform.

  • multimode precoding in millimeter wave mimo transmitters with multiple antenna sub arrays
    Global Communications Conference, 2013
    Co-Authors: Omar El Ayach, Robert W. Heath, Sridhar Rajagopal, Zhouyue Pi
    Abstract:

    Millimeter wave (mmWave) systems must use beamforming to overcome the heavy attenuation at mmWave frequencies and establish high-quality communication links with reasonably high spectral efficiency. When received signal power is sufficiently large and the propagation channel is sufficiently rich, beamforming with multiple data streams, known as precoding, could further increase data rates in mmWave systems. The high cost of digital devices in mmWave systems, however, implies that precoding is predominantly done in the Analog Domain, making mmWave precoding significantly more constrained than traditional multiple-input multiple-output (MIMO) solutions. In this paper, we propose an iterative precoding algorithm for a practical mmWave transmitter architecture in which all precoding is done in the Analog Domain. In addition to precoding, the proposed algorithm allows the mmWave system to adapt the rank of its transmission in response to varying propagation conditions. We present numerical results showing that the proposed multimode precoding algorithm allows systems to achieve large data rates, in some cases approaching channel capacity.

  • GLOBECOM – Multimode precoding in millimeter wave MIMO transmitters with multiple antenna sub-arrays
    2013 IEEE Global Communications Conference (GLOBECOM), 2013
    Co-Authors: Omar El Ayach, Robert W. Heath, Sridhar Rajagopal
    Abstract:

    Millimeter wave (mmWave) systems must use beamforming to overcome the heavy attenuation at mmWave frequencies and establish high-quality communication links with reasonably high spectral efficiency. When received signal power is sufficiently large and the propagation channel is sufficiently rich, beamforming with multiple data streams, known as precoding, could further increase data rates in mmWave systems. The high cost of digital devices in mmWave systems, however, implies that precoding is predominantly done in the Analog Domain, making mmWave precoding significantly more constrained than traditional multiple-input multiple-output (MIMO) solutions. In this paper, we propose an iterative precoding algorithm for a practical mmWave transmitter architecture in which all precoding is done in the Analog Domain. In addition to precoding, the proposed algorithm allows the mmWave system to adapt the rank of its transmission in response to varying propagation conditions. We present numerical results showing that the proposed multimode precoding algorithm allows systems to achieve large data rates, in some cases approaching channel capacity.

David V. Anderson – One of the best experts on this subject based on the ideXlab platform.

  • ICASSP – Compressive sensing on a CMOS separable transform image sensor
    2008 IEEE International Conference on Acoustics Speech and Signal Processing, 2008
    Co-Authors: Ryan Robucci, Leung Kin Chiu, J.d. Gray, Justin Romberg, Paul Hasler, David V. Anderson
    Abstract:

    This paper discusses the application of a computational image sensor, capable of performing separable 2-D transforms on images in the Analog Domain, to compressive sensing. Instead of sensing and transmitting raw pixel data, this image sensor first projects the image onto a separable 2-D basis set. The inner products computed in these projections are computed in the Analog Domain using a computational focal-plane and a computational Analog vector-matrix multiplier. Since this operation is performed in the Analog Domain, components such as the Analog-to-digital converters can be taxed less when a only subset of correlations are performed. Compressed sensing theory prescribes the use of a pseudo-random, incomplete basis set, allowing for sampling at less than the Nyquist rate. This can reduce power consumption or increase frame rate.