Approaching Nyquist Limit in WDM Systems by Low-Complexity Receiver-Side Duobinary Shaping

Li, Jianqiang; Tipsuwannakul, Ekawit; Eriksson, Tobias A.; Karlsson, Magnus; Andrekson, Peter A.

doi:10.1109/jlt.2012.2190972

Cited by 126 publications

(60 citation statements)

References 23 publications

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“…Therefore, η > 1 and β > 0 is required for timing error estimation in the frequency domain. The same limitation occurs for a duobinary signal [16]; here too, no elements would be left in the summation.…”

Section: Modified Godard Algorithm For Simplified Clock Tone Calculationmentioning

confidence: 88%

Modified Godard Timing Recovery for Non Integer Oversampling Receivers

et al. 2017

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Abstract:A timing recovery algorithm is introduced that operates with less than two samples per symbol and provides an enormous complexity reduction. The complexity reduction is due to a synergy with the already existing Fourier transforms in a coherent receiver, an avoidance of terms that are dominated by noise, and a complete elimination of multiplications. A simulation and an experiment with a single carrier modulation format show that the inherent timing jitter is, despite of the significant complexity reduction, comparable with the state of the art, and in particular outperforms the Godard algorithm for low roll-off factors. In addition, it is one of the few algorithms that operates with less than two samples per symbol in the frequency domain, and thus enables the lowest complexity in a receiver.

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Section: Modified Godard Algorithm For Simplified Clock Tone Calculationmentioning

confidence: 88%

Modified Godard Timing Recovery for Non Integer Oversampling Receivers

et al. 2017

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“…Finally, the signal is detected by MLSD in use of intersymbol memory for data BER measurement. As a comparison, CMA plus post-filter scheme as well as MLSD detection in [6][7][8][9] is also evaluated.…”

Section: Experiments and Discussionmentioning

confidence: 99%

“…However, a little higher OSNR is required since multilevel detection must be applied to the 9-QAM signal. The signal can be finally detected with MLSD algorithm which makes use of the inherent intersymbol memory and minimizes the number of error by selecting the most probable trellis path [6]. In order to decrease the signal ISI, an adaptive 9-tap finite impulse response (FIR) filter can be applied.…”

Section: Operation Principle and Simulationmentioning

confidence: 99%

“…A post-filter with 2 taps (i.e. one symbol delay and add), which performs the function of duobinary shaping, is proposed in the references [6,7] to further release strong filtering limitation. Figure 4(a) shows the T samples suffering from severe ISI.…”

Section: Operation Principle and Simulationmentioning

confidence: 99%

“…Recently, quadrature duobinary (QDB) is proposed to approach SE of 4 bit/s/Hz [3][4][5]. A simpler and more realistic means is spectrum shaping based on the wavelength selective switch (WSS) [6][7][8][9][10]. A post-filter by receiver-side duobinary shaping is used in order to apply conventional digital signal processing (DSP) schemes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Robust 9-QAM digital recovery for spectrum shaped coherent QPSK signal

Huang¹,

Zhang²,

Yu³

et al. 2013

Opt. Express

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Abstract:We propose 9-ary quadrature amplitude modulation (9-QAM) data recovery for polarization multiplexing-quadrature phase shift keying (PM-QPSK) signal in presence of strong filtering to approach Nyquist bandwidth. The decision-directed least radius distance (DD-LRD) algorithm for blind equalization is used for 9-QAM recovery and intersymbol interference (ISI) compression. It shows the robustness under strong filtering to recover 9-QAM signal rather than QPSK. We demonstrate 112 Gb/s spectrum shaped PM-QPSK signal by wavelength selective switch (WSS) in a 25-GHz channel spacing Nyquist wavelength division multiplexing (NWDM). The final equalized signal is detected by maximum likelihood sequence decision (MLSD) for data bit-error-ratio (BER) measurement. Optical signal-to-noise ratio (OSNR) tolerance is improved by 0.5 dB at a BER of 1x10 −3 compared to constant modulus algorithm (CMA) plus post-filter algorithm.

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Spectrally Efficient Multiplexing: NYQUIST‐WDM

Bosco

2016

Enabling Technologies for High Spectral‐Efficiency Coherent Optical Communication Networks

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Approaching Nyquist Limit in WDM Systems by Low-Complexity Receiver-Side Duobinary Shaping

Cited by 126 publications

References 23 publications

Modified Godard Timing Recovery for Non Integer Oversampling Receivers

Modified Godard Timing Recovery for Non Integer Oversampling Receivers

Robust 9-QAM digital recovery for spectrum shaped coherent QPSK signal

Spectrally Efficient Multiplexing: NYQUIST‐WDM

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