Blind Phase Noise Estimation for CO-OFDM Transmissions

Le, Son Thai; Haigh, Paul Anthony; Ellis, A.D.; Turitsyn, Sergei K.

doi:10.1109/jlt.2015.2469542

Cited by 35 publications

(35 citation statements)

References 21 publications

(21 reference statements)

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“…Pilot-aided algorithms in CO-OFDM can virtually compensate any residual phase noise from carrier drifting (measured up to 1 MHz). On the contrary, implementing fully-blind phase noise estimation in CO-OFDM is very challenging without considering complex differential bit encoding due to CO-OFDM's long symbol duration and large carrier offset [35]. Finally, it is worth noting that a similar transmission performance is also anticipated from benchmark single-carrier modulation schemes such as Nyquist wavelength division multiplexing [36].…”

Section: Resultsmentioning

confidence: 99%

Chip-based Brillouin processing for carrier recovery in self-coherent optical communications

Choudhary

Mägi

Marpaung

et al. 2018

Optica

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Modern fiber-optic coherent communications employ advanced, spectrally-efficient modulation formats that require sophisticated narrow linewidth local oscillators (LOs) and complex digital signal processing (DSP). Self-coherent optical orthogonal frequency-division multiplexing (Self-CO-OFDM) is a modern technology that retrieves the frequency and phase information from the extracted carrier without employing a LO or additional DSP. However, a wide guardband is typically required to easily filter out the optical carrier at the receiver, thus discarding many OFDM middle subcarriers that limits the system data rate. Here, we establish an optical technique for carrier recovery harnessing large-gain stimulated Brillouin scattering (SBS) on a photonic chip for up to 116.82 Gbit⋅s -1 Self-CO-OFDM signals, without requiring a separate LO. The narrow SBS linewidth allows for a record-breaking small carrier guardband of ~265 MHz in Self-CO-OFDM, resulting in higher capacity than benchmark self-coherent multi-carrier schemes. Chip-based SBS-self-coherent technology reveals comparable performance to state-of-the-art coherent optical receivers while relaxing the requirements of the DSP. In contrast to SBS processing on-fiber, our solution provides phase and polarization stability. Our demonstration develops a low-noise and frequency-preserving filter that synchronously regenerates a low-power narrowband optical tone, which could relax the requirements on very-high-order modulation signaling for future communication networks. The proposed hybrid carrier filtering-and-regeneration technique could be useful in long-baseline interferometry for precision optical timing or reconstructing a reference tone for quantum-state measurements.

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Section: Resultsmentioning

confidence: 99%

Chip-based Brillouin processing for carrier recovery in self-coherent optical communications

Choudhary

Mägi

Marpaung

et al. 2018

Optica

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“…This can be achieved in reduced-guard-band or even zero-guard-band OFDM thanks to the fast development in digital signal processing (DSP) for fiber linear compensation techniques [3]. In this scenario, the influence of PN on CO-OFDM system performance is dominated by the CPE rather than ICI [3,4]. In addition, it has been shown that reducing the number of subcarriers effectively increases the transmission performance of multi-carrier systems due to the reduction of nonlinear impairments [5].…”

Section: Introductionmentioning

confidence: 99%

“…There have been several techniques in the literature to deal with CPE [3,4,6,7]. The most widely approach is pilot-aided (PA) technique due to its simplicity.…”

Section: Introductionmentioning

confidence: 99%

“…To further increase SE, several blind phase noise estimation (PNE) techniques have been proposed in the literature. For instance, authors in [8] proposed the blind phase search (BPS) direct decision (DD) method for single carrier transmission and its modification -the BPS decision directed free (DDF) technique in [4] was developed for CO-OFDM. More recently, a trellis-based phase correction has been proposed for single carrier transmission but its applications for multicarrier systems have not been carried out [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…More recently, a trellis-based phase correction has been proposed for single carrier transmission but its applications for multicarrier systems have not been carried out [9,10]. In general, the complexity of blind PNE is higher than that of pilot based methods by a factor of hundreds or even thousands [4]. They normally require phase tracking circuit operating either in feedback loop (FL) or in digital phase tracking manner to avoid phase uncertainty issues in CO-OFDM [4].…”

Section: Introductionmentioning

confidence: 99%

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Simplified extended Kalman filter phase noise estimation for CO-OFDM transmissions

Nguyen

Wuilpart

et al. 2017

Opt. Express

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We propose a flexible simplified extended Kalman filter (S-EKF) scheme that can be applied in both pilot-aided and blind modes for phase noise compensation in 16-QAM CO-OFDM transmission systems employing a small-to-moderate number of subcarriers. The performance of the proposed algorithm is evaluated and compared with conventional pilot-aided (PA) and blind phase search (BPS) methods via extensive an Monte Carlo simulation in a back-to-back configuration and with a dual polarization fiber transmission. For 64 subcarrier 32 Gbaud 16-QAM CO-OFDM systems with 200 kHz combined laser linewidths, an optical signal-to-noise ratio penalty as low as 1 dB can be achieved with the proposed S-EKF scheme using only 2 pilots in the pilot-aided mode and just 4 inputs in the blind mode, resulting in a spectrally efficient enhancement by a factor of 3 and a computational effort reduction by a factor of more than 50 in comparison with the conventional PA and the BPS methods, respectively.

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Iterative detection of CO‐OFDM signals with phase errors using circular random variables

Rezenom

Takawira

2022

Int J Communication

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Summary We propose a low‐complexity graph‐based iterative algorithm for the detection of coherent optical OFDM signals in the presence of residual carrier frequency offset and phase noise. We exploit the circular properties of the frequency offset and phase noise and derive graphical messages using the Gaussian probability density function. The proposed algorithm shows similar error rate performance as the existing algorithm at a much lower implementation complexity.

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Blind Phase Noise Estimation for CO-OFDM Transmissions

Cited by 35 publications

References 21 publications

Chip-based Brillouin processing for carrier recovery in self-coherent optical communications

Chip-based Brillouin processing for carrier recovery in self-coherent optical communications

Simplified extended Kalman filter phase noise estimation for CO-OFDM transmissions

Iterative detection of CO‐OFDM signals with phase errors using circular random variables

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