Adaptive EKF Based Estimation Method for Phase Noise in CO-OFDM/OQAM System

Wang, Xiaobo; Liu, Yang; Luo, Fengguang; Yang, Shuailong; Du, Yuting

doi:10.1109/access.2020.3037312

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…A simple phase noise (PN) model has been proposed by [24], based on the channel effect of OFDM/OQAM and the distribution feature of intrinsic interference. An adaptive extended Kalman filter (AEKF) blind scheme has been developed based on the theory of the Kalman filter and the PN model to achieve flexibility in dynamic networks.…”

Section: Literature Reviewmentioning

confidence: 99%

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Highly Accurate Technique for CO-OFDM Channel Estimation Technique Using Extreme Learning Machine (ELM)

Joseph

Puttamadappa

2023

Wseas Transactions on Electronics

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In wireless systems, channel estimation is considered a problematic technology, due to the fact of the difference in time between wireless channels and the noise effect. Orthogonal frequency-division multiplexing (OFDM) is a promising candidate for future optical communications and has received wide concern. The article proposed a Coherent Optical (CO) orthogonal frequency division multiplexing (OFDM) scheme, which gives a scalable and flexible solution for increasing the transmission rate, being extremely robust to chromatic dispersion as well as polarization mode dispersion. Nevertheless, both coherent detection and OFDM are prone to phase noise due to the phase mismatch between the laser oscillators at the transmitter and receiver sides and the relatively long OFDM symbol duration compared to that of single carrier communications. An Extreme Learning Machine (ELM) with Pilot Assisted Equalization (PEM) is proposed for compensation of impairments caused by fibre nonlinearity in coherent optical communication systems. Channel estimation using ELM and the value of distortion is sent to the OSTBC receiving end based on the distortion information the data is decoded and pilot data is removed. FFT is applied to the data and QPSK demodulation is done in the data to get its original form. In addition, the article utilized a free-space optical communication system of multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) with a modified receiver structure. Simulation reveals that the proposed model exhibits significant BER (0.0112) performance and provides better spectral efficiency as compared with conventional systems and less computational complexity. This suggested that the proposed method shows better performance by using the CO-OFDM-FSO-MIMO-ELM-based channel estimation technique for high-speed data communication networks in real-time scenarios respectively.

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Section: Literature Reviewmentioning

confidence: 99%

“…To fit the histogram of the network gains to a certain probability density function (PDF), such as lognormal, Nakagami, Rayleigh, Weibull, etc., statistical modelling for the dynamic WBAN channels must take this into account. AIC denotes the Akaike Information Criterion which is expressed in equation (24) as…”

Section: Channel Model Of Co-ofdmmentioning

confidence: 99%

Highly Accurate Technique for CO-OFDM Channel Estimation Technique Using Extreme Learning Machine (ELM)

Joseph

Puttamadappa

2023

Wseas Transactions on Electronics

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“…The suggested channel estimation approach provides superior performance to other traditional channel estimation methods and it is effective, which is evaluated based on the simulation findings. A more straightforward PN model for OQAM/OFDM under channel influence is derived by Wang et al [19] by the intrinsic interference-based distribution feature. A feedback loop-based search called modified blind phase has a commercial laser linewidth of 200 kHz time complexity, which is just a third as wide.…”

Section: Introductionmentioning

confidence: 99%

Estimation of channel distortion in orthogonal frequency division multiplexing system using pilot technique

Joseph

Gowda

2022

IJEECS

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Orthogonal frequency-division multiplexing (OFDM) is resistant to frequency selective fading due to the longer symbol duration. However, mobile applications channel timing fluctuations in one OFDM signal cause intercarrier-interference (ICI), which reduces performance. This research presented the support vector regression (SVR) model-based channel estimation technique for coherent optical communication systems. Due to the coherent optical orthogonal frequency-division-multiplexed (COOFDM) system, a channel model is developed that includes linear fibre dispersion effects, noise from optical amplifiers, and inter-carrier interference generated by laser phase noise. As a result, for such a system, an accurate channel estimate is essential. Based on this concept, derivation of channel estimation and phase estimation for the system of CO-OFDM. The proposed method is tested and evaluated using MATLAB software. Computer simulation results for several standard methods such as extreme learning machines (ELM) and artificial neural networks (ANN) validate the feasibility of the suggested methodology. The CO-OFDM system’s transmission experiments and computer simulations prove that the support vector machine-based model following pilot-assisted phase estimation gives the optimal performance. Therefore, results depicted that the channel estimation utilizing the SVR model gives good performance than the other methods, thus the proposed model gives an accurate CE process, respectively.

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Analysis of phase noise for DFT-spread OFDM systems in coherent optical communication

Wu,

Wang,

et al. 2024

Optical Fiber Technology

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Adaptive EKF Based Estimation Method for Phase Noise in CO-OFDM/OQAM System

Cited by 9 publications

References 33 publications

Highly Accurate Technique for CO-OFDM Channel Estimation Technique Using Extreme Learning Machine (ELM)

Highly Accurate Technique for CO-OFDM Channel Estimation Technique Using Extreme Learning Machine (ELM)

Estimation of channel distortion in orthogonal frequency division multiplexing system using pilot technique

Analysis of phase noise for DFT-spread OFDM systems in coherent optical communication

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