Soft-Decision LDPC Turbo Decoding for DQPSK Modulation in Coherent Optical Receivers

Yu, Fan; Stojanović, Nebojša; Hauske, Fabian N.; Chang, Deyuan; Xiao, Zijian; Bauch, Gerhard; Pflueger, Doris; Xie, Changsong; Zhao, Yu; Jin, Lu; Li, Y.; Li, L.; Xu, Xiaogeng; Xiong, Qianjin

doi:10.1364/ecoc.2011.we.10.p1.70

Cited by 21 publications

(15 citation statements)

References 5 publications

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“…Ours is a straightforward method, based on a simple model, that enables us to design low-complexity interleavers and binary BCH codes for any post-FEC BER with little simulation effort. Compared to our method, the approaches presented in [6]- [8] achieve better performance by using soft information. However, those schemes are more complex to implement, and require extensive simulations for low post-FEC BERs.…”

Section: Introductionmentioning

confidence: 93%

See 1 more Smart Citation

Interleavers and BCH Codes for Coherent DQPSK Systems With Laser Phase Noise

Leong

Larsen

Jacobsen

et al. 2015

IEEE Photon. Technol. Lett.

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Abstract-The relatively high phase noise of coherent optical systems poses unique challenges for forward error correction (FEC). In this letter, we propose a novel semi-analytical method for selecting combinations of interleaver lengths and binary Bose-Chaudhuri-Hocquenghem (BCH) codes that meet a target post-FEC bit error rate (BER). Our method requires only short pre-FEC simulations, based on which we design interleavers and codes analytically. It is applicable to pre-FEC BER around 10 −3 , and any post-FEC BER. Additionally, we show that there is a trade-off between code overhead and interleaver delay. Finally, for a target of 10 −5 , numerical simulations show that interleavercode combinations selected using our method have post-FEC BER around 2× target. The target BER is achieved with 0.1 dB extra signal-to-noise ratio.

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Section: Introductionmentioning

confidence: 93%

“…Recently, several approaches have been proposed. In [6]- [8], the authors consider low-density parity-check (LDPC) codes. In [9], we consider binary Bose-Chaudhuri-Hocquenghem (BCH) and Reed-Solomon (RS) codes.…”

Section: Introductionmentioning

confidence: 99%

Interleavers and BCH Codes for Coherent DQPSK Systems With Laser Phase Noise

Leong

Larsen

Jacobsen

et al. 2015

IEEE Photon. Technol. Lett.

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show abstract

“…For DE Diff. the LLR metric is computed as described in [17], [18]. The advantage [3] is used to perform demodulation in (9), the loss compared to soft decoding of DE QPSK with coherent demodulation is 0.45 dB for σ = 6.2 · 10 −2 rad and 0.65 dB for σ = 8 · 10 −2 rad.…”

Section: Simulation Resultsmentioning

confidence: 99%

Impact of Nonideal Phase Reference on Soft Decoding of Differentially Encoded Modulation

Magarini

Barletta

Spalvieri

et al. 2012

IEEE Photon. Technol. Lett.

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The performance of coded modulation schemes based on the concatenation of a forward-error correction (FEC) code and differentially encoded quadrature amplitude modulations (QAMs) in the presence of Wiener phase noise is considered. Log-likelihood ratios, required to perform soft decoding, are first derived for the case in which the phase of the received carrier is assumed to be perfectly known, and then used to obtain the performance for nonideal reference of phase. Simulation results of the post-FEC bit-error rate are presented for a near-Shannon limit low-density parity check code with an overhead of 20%. The performance loss, compared to ideal coherent demodulation, is evaluated for two different linewidths of the phase noise in case of quadrature-phase shift keying and 16-QAM transmission.

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“…Ours is a straightforward method, based on a simple model, that enables us to design lowcomplexity interleavers and binary BCH codes for any post-FEC BER with little simulation effort. Compared to our method, the approaches in [9][10][11] achieve better performance by using soft information. However, those schemes are more complex to implement, and require extensive simulations for low post-FEC BERs.…”

Section: Introductionmentioning

confidence: 93%

“…Recently, several FEC approaches have been proposed for systems with PN. In [9][10][11], the authors consider low-density parity-check (LDPC) codes. In [12], we propose a method for selecting binary BCH codes using a correlated bivariate binomial model.…”

Section: Introductionmentioning

confidence: 99%

Low-complexity BCH codes with optimized interleavers for DQPSK systems with laser phase noise

et al. 2016

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The presence of high phase noise in addition to additive white Gaussian noise in coherent optical systems affects the performance of forward error correction (FEC) schemes. In this paper, we propose a simple scheme for such systems, using block interleavers and binary Bose-Chaudhuri-Hocquenghem (BCH) codes. The block interleavers are specifically optimized for differential quadrature phase shift keying modulation. We propose a method for selecting BCH codes that, together with the interleavers, achieve a target post-FEC bit error rate (BER). This combination of interleavers and BCH codes has very low implementation complexity. In addition, our approach is straightforward, requiring only short pre-FEC simulations to parameterize a model, based on which we select codes analytically. We aim to correct a pre-FEC BER of around 10 −3 . We evaluate the accuracy of our approach using numerical simulations. For a target post-FEC BER of 10 −6 , codes selected using our method result in BERs around 3× target, and achieve the target with around 0.2 dB extra signal-to-noise ratio.

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Soft-Decision LDPC Turbo Decoding for DQPSK Modulation in Coherent Optical Receivers

Cited by 21 publications

References 5 publications

Interleavers and BCH Codes for Coherent DQPSK Systems With Laser Phase Noise

Interleavers and BCH Codes for Coherent DQPSK Systems With Laser Phase Noise

Impact of Nonideal Phase Reference on Soft Decoding of Differentially Encoded Modulation

Low-complexity BCH codes with optimized interleavers for DQPSK systems with laser phase noise

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