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Roger Philip Giddings - One of the best experts on this subject based on the ideXlab platform.

  • Hybrid SSB OFDM-Digital Filter Multiple Access PONs
    Journal of Lightwave Technology, 2020
    Co-Authors: A. Sankoh, Yixian Dong, T. Durrant, Z. Q. Zhong, Maurice O'sullivan, Roger Philip Giddings, Jianming Tang
    Abstract:

    The previously reported hybrid orthogonal frequency division multiplexing-Digital Filter multiple access (OFDM-DFMA) PONs offer promising solutions for seamlessly converging optical and mobile networks for 5G. However, the hybrid OFDM-DFMA PONs based on intensity-modulation and direct-detection (IMDD) convey double sideband (DSB) signals at different sub-wavelengths, this halves the spectral efficiency and signal transmission capacity. In this article, hybrid single sideband (SSB) OFDM-DFMA PONs are proposed and explored, for the first time, where multiple SSB OFDM channels produced without employing the Hilbert transform operation are multiplexed using orthogonal Digital Filtering in ONUs, and demultiplexed/demodulated by a single FFT operation in OLT without incorporating matching Filters. It is shown that similar to the DSB PON, the proposed SSB PON has excellent robustness against Digital Filter characteristic variations and channel interferences. More importantly, it decreases peak-to-average power ratios (PAPRs) of Digitally-Filtered OFDM signals by >2 dB, thus leading to >2 dB reductions in optimum signal clipping ratio and >1 bit reductions in minimum required DAC/ADC resolution bits. For fixed spectral bandwidths, the SSB PON almost doubles the maximum upstream transmission capacity without considerably degrading its differential ONU optical launch power dynamic range compared to the DSB PON. While for fixed upstream signal transmission capacities, compared to the DSB PON, the SSB PON not only halves the overall signal transmission bandwidth, but also leads to >2.5 dB (>1.2 dB) improvements in power budget (differential optical launch power dynamic range for ONUs locating at high frequency regions).

  • Digital Filter multiple access PONs with DSP-enabled software reconfigurability
    IEEE OSA Journal of Optical Communications and Networking, 2015
    Co-Authors: Mario Bolea, M. Bouich, Roger Philip Giddings, Christelle Aupetit-berthelemot, J M Tang
    Abstract:

    Digital Filter multiple access (DFMA) passive optical networks (PONs) are, for the first time to our knowledge, proposed and extensively investigated, where Digital signal processing (DSP)-enabled, software-reconfigurable, Digital orthogonal Filtering is employed in each individual optical network unit (ONU) and the optical line terminal to enable all ONUs to dynamically share the transmission medium under the control of the centralized software-defined controller and the transceiver-embedded DSP controllers. The DFMA PONs fully support software-defined networking with the network control further extended to the physical layer. As Digital Filtering is the fundamental process at the heart of the proposed DFMA PONs, the Filtering-induced tradeoffs among upstream transmission capacity, Filter design flexibility, and Filter DSP complexity are examined, based on which optimum Filter design guidelines are identified for various application scenarios. Furthermore, the performance characteristics of the DFMA PONs are also numerically explored in terms of maximum achievable upstream transmission capacity, differential ONU launch power dynamic range, and ONU count-dependent minimum received optical power.

Jianming Tang - One of the best experts on this subject based on the ideXlab platform.

  • Hybrid SSB OFDM-Digital Filter Multiple Access PONs
    Journal of Lightwave Technology, 2020
    Co-Authors: A. Sankoh, Yixian Dong, T. Durrant, Z. Q. Zhong, Maurice O'sullivan, Roger Philip Giddings, Jianming Tang
    Abstract:

    The previously reported hybrid orthogonal frequency division multiplexing-Digital Filter multiple access (OFDM-DFMA) PONs offer promising solutions for seamlessly converging optical and mobile networks for 5G. However, the hybrid OFDM-DFMA PONs based on intensity-modulation and direct-detection (IMDD) convey double sideband (DSB) signals at different sub-wavelengths, this halves the spectral efficiency and signal transmission capacity. In this article, hybrid single sideband (SSB) OFDM-DFMA PONs are proposed and explored, for the first time, where multiple SSB OFDM channels produced without employing the Hilbert transform operation are multiplexed using orthogonal Digital Filtering in ONUs, and demultiplexed/demodulated by a single FFT operation in OLT without incorporating matching Filters. It is shown that similar to the DSB PON, the proposed SSB PON has excellent robustness against Digital Filter characteristic variations and channel interferences. More importantly, it decreases peak-to-average power ratios (PAPRs) of Digitally-Filtered OFDM signals by >2 dB, thus leading to >2 dB reductions in optimum signal clipping ratio and >1 bit reductions in minimum required DAC/ADC resolution bits. For fixed spectral bandwidths, the SSB PON almost doubles the maximum upstream transmission capacity without considerably degrading its differential ONU optical launch power dynamic range compared to the DSB PON. While for fixed upstream signal transmission capacities, compared to the DSB PON, the SSB PON not only halves the overall signal transmission bandwidth, but also leads to >2.5 dB (>1.2 dB) improvements in power budget (differential optical launch power dynamic range for ONUs locating at high frequency regions).

J M Tang - One of the best experts on this subject based on the ideXlab platform.

  • Digital Filter multiple access PONs with DSP-enabled software reconfigurability
    IEEE OSA Journal of Optical Communications and Networking, 2015
    Co-Authors: Mario Bolea, M. Bouich, Roger Philip Giddings, Christelle Aupetit-berthelemot, J M Tang
    Abstract:

    Digital Filter multiple access (DFMA) passive optical networks (PONs) are, for the first time to our knowledge, proposed and extensively investigated, where Digital signal processing (DSP)-enabled, software-reconfigurable, Digital orthogonal Filtering is employed in each individual optical network unit (ONU) and the optical line terminal to enable all ONUs to dynamically share the transmission medium under the control of the centralized software-defined controller and the transceiver-embedded DSP controllers. The DFMA PONs fully support software-defined networking with the network control further extended to the physical layer. As Digital Filtering is the fundamental process at the heart of the proposed DFMA PONs, the Filtering-induced tradeoffs among upstream transmission capacity, Filter design flexibility, and Filter DSP complexity are examined, based on which optimum Filter design guidelines are identified for various application scenarios. Furthermore, the performance characteristics of the DFMA PONs are also numerically explored in terms of maximum achievable upstream transmission capacity, differential ONU launch power dynamic range, and ONU count-dependent minimum received optical power.

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

  • Hybrid SSB OFDM-Digital Filter Multiple Access PONs
    Journal of Lightwave Technology, 2020
    Co-Authors: A. Sankoh, Yixian Dong, T. Durrant, Z. Q. Zhong, Maurice O'sullivan, Roger Philip Giddings, Jianming Tang
    Abstract:

    The previously reported hybrid orthogonal frequency division multiplexing-Digital Filter multiple access (OFDM-DFMA) PONs offer promising solutions for seamlessly converging optical and mobile networks for 5G. However, the hybrid OFDM-DFMA PONs based on intensity-modulation and direct-detection (IMDD) convey double sideband (DSB) signals at different sub-wavelengths, this halves the spectral efficiency and signal transmission capacity. In this article, hybrid single sideband (SSB) OFDM-DFMA PONs are proposed and explored, for the first time, where multiple SSB OFDM channels produced without employing the Hilbert transform operation are multiplexed using orthogonal Digital Filtering in ONUs, and demultiplexed/demodulated by a single FFT operation in OLT without incorporating matching Filters. It is shown that similar to the DSB PON, the proposed SSB PON has excellent robustness against Digital Filter characteristic variations and channel interferences. More importantly, it decreases peak-to-average power ratios (PAPRs) of Digitally-Filtered OFDM signals by >2 dB, thus leading to >2 dB reductions in optimum signal clipping ratio and >1 bit reductions in minimum required DAC/ADC resolution bits. For fixed spectral bandwidths, the SSB PON almost doubles the maximum upstream transmission capacity without considerably degrading its differential ONU optical launch power dynamic range compared to the DSB PON. While for fixed upstream signal transmission capacities, compared to the DSB PON, the SSB PON not only halves the overall signal transmission bandwidth, but also leads to >2.5 dB (>1.2 dB) improvements in power budget (differential optical launch power dynamic range for ONUs locating at high frequency regions).

N R Shanbhag - One of the best experts on this subject based on the ideXlab platform.

  • a voltage overscaled low power Digital Filter ic
    IEEE Journal of Solid-state Circuits, 2004
    Co-Authors: R Hegde, N R Shanbhag
    Abstract:

    In this brief, we present an integrated circuit implementation of a low-power Digital Filter in 0.35-/spl mu/m 3.3-V CMOS process. The low-power technique combines voltage overscaling (VOS) and algorithmic noise tolerance (ANT) to push the limits of energy efficiency beyond that achievable by voltage scaling alone. VOS refers to scaling the supply voltage beyond the limit imposed by the throughput constraints. ANT is an algorithmic level error-control technique that is employed to restore the algorithmic performance degradation in terms of output signal-to-noise ratio (SNR) caused by VOS. Measured results indicate 40%-67% reduction in energy dissipation over optimally voltage-scaled systems with less than 1-dB loss in SNR for a wide range of Filter bandwidths (0.05f/sub s/-0.25f/sub s/, where f/sub s/ is the sampling frequency).