Foreword

Ling, Feng; Proakis, J.G.

doi:10.1017/9781316335444.001

Cited by 128 publications

(225 citation statements)

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“…Here   can be viewed as a discrete time impulse response characterizing the optical channel corrupted by CD. In the ideal optical communication scenario,   satisfies Nyquist criterion [14], i.e.,…”

Section: Proposed CD Monitoring Methods Using Isimentioning

confidence: 99%

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An Electronic Domain Chromatic Dispersion Monitoring Scheme Insensitive to OSNR Using Kurtosis

Kim

Lee

Chung

et al. 2008

Journal of the Optical Society of Korea

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In this paper we present an electronic domain solution for chromatic dispersion (CD) monitoring algorithm based on the estimated time domain channel in electronic domain using channel estimation methods. The proposed scheme utilizes kurtosis as a CD measurement, directly computed from the estimated inter-symbol-interference (ISI) channel due to the CD distortion. Hence, the proposed scheme exhibits robust performance under OSNR variation, in contrast to the existing electronic domain approach based on minimum mean squared error (MMSE) fractionally-spaced equalizer taps [1]. The simulation results verify the CD monitoring ability of the proposed scheme.

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Section: Proposed CD Monitoring Methods Using Isimentioning

confidence: 99%

“…However, in the presence of CD, the impulse response violates Nyquist criterion and causes inter-symbol-interference (ISI) [14]. The severity of the ISI increases as the CD parameter in (2).…”

Section: Proposed CD Monitoring Methods Using Isimentioning

confidence: 99%

An Electronic Domain Chromatic Dispersion Monitoring Scheme Insensitive to OSNR Using Kurtosis

Kim

Lee

Chung

et al. 2008

Journal of the Optical Society of Korea

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“…(4) and (5) reduces the computation complexity by at least a factor of two compared to that without a recursive algorithm [5]. The complexity of a MAP detector in CoWDM systems is higher than that of a conventional MAP or maximum likelihood sequence estimation (MLSE) [6] but the overall complexity scales approximately linearly with the channel number N for large N. Note that the overall complexity of FFT/IFFT in the OFDM technique is also approximately proportional to N. However, the MAP detector performs parallel processing of each sub-channel, whereas OFDM requires joint signal processing of all sub-channels with associated synchronization, serial/parallel conversion etc, so that the total capacity is limited by the speed of the electronic circuitry. Therefore, CoWDM based on MAP processing would be a promising solution for ultra high-capacity spectrally-efficient optical transmission.…”

Section: Principle and Simulation Modelmentioning

confidence: 99%

“…It can therefore be viewed as a compromise between high-speed CoWDM using channel-by-channel hard decision and OFDM with joint electronic processing of all sub-channels. A conventional MAP detector, employed to compensate inter-symbol interference (ISI), calculates the probability of obtaining each possible value of a given bit based on the received signal amplitudes and selects the bit value which has the maximum probability [6]. In this …”

Section: Introductionmentioning

confidence: 99%

MAP detection for impairment compensation in coherent WDM systems

Zhao¹,

Ellis²

2009

Opt. Express

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Abstract:We propose a novel recursive-algorithm based maximum a posteriori probability (MAP) detector in spectrally-efficient coherent wavelength division multiplexing (CoWDM) systems, and investigate its performance in a 1-bit/s/Hz on-off keyed (OOK) system limited by opticalsignal-to-noise ratio. The proposed method decodes each sub-channel using the signal levels not only of the particular sub-channel but also of its adjacent sub-channels, and therefore can effectively compensate deterministic inter-sub-channel crosstalk as well as inter-symbol interference arising from narrow-band filtering and chromatic dispersion (CD). Numerical simulation of a five-channel OOK-based CoWDM system with 10Gbit/s per channel using either direct or coherent detection shows that the MAP decoder can eliminate the need for phase control of each optical carrier (which is necessarily required in a conventional CoWDM system), and greatly relaxes the spectral design of the demultiplexing filter at the receiver. It also significantly improves back-to-back sensitivity and CD tolerance of the system.

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“…In an AWGN channel where g k = 1 in equation (2) and equation (3), the error probability can be derived [4]:…”

Section: Performance Of Reference-based Coherent Bpskmentioning

confidence: 99%

Theoretical performance comparison between reference-based coherent BPSK and BCH coded differential BPSK

McGeehan

Bateman

[Conference Record] GLOBECOM '92 - Communications for Global Users: IEEE

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Both channel sounding and channel coding are well-known techniques for improving BER performance of data transmission over a narrow band mobile radio channel. The two techniques share a common ground with regard to the fact that both of them employ redundancy signals (reference signals for channel sounding and parity check bits for channel coding) to achieve the improved performance. In this paper, a comparison of theoretical PSK performance in BER is made between the referencebased coherent detection and the BCH coded differential detection under different fading conditions. Comparisons are also made between reference-based coherent detection and BCH coded decision-feedback DPSK.

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Foreword

Cited by 128 publications

References 0 publications

An Electronic Domain Chromatic Dispersion Monitoring Scheme Insensitive to OSNR Using Kurtosis

An Electronic Domain Chromatic Dispersion Monitoring Scheme Insensitive to OSNR Using Kurtosis

MAP detection for impairment compensation in coherent WDM systems

Theoretical performance comparison between reference-based coherent BPSK and BCH coded differential BPSK

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