Performance evaluation of (D)APSK modulated coherent optical OFDM system

Hui, Wu; Kong, Deming; Li, Yan; Wu, Jian; Lin, Jintong

doi:10.1016/j.yofte.2013.02.003

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…Therefore, the likelihood function is very complex. To the maximu m value of the likelihood function, we do not directly make ( , ) df  biggest, but to make the formula (2) Maximu m [5]:…”

Section: Improved Timing Estimation Algorithm and Simulation Analmentioning

confidence: 99%

OFDM Synchronization Improved Algorithm Based on Cyclic Prefix

Zhang¹,

Chen²,

Zhang³

2015

Proceedings of the International Conference on Computer Information Systems and Industrial Applications

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The current study synchronization algorithm based on cyclic prefix, requirements of cyclic prefix length cannot be greater than OFDM the 1/4 of the symbol timing synchronization, otherwise, the system timing synchronization error will be significant. Aiming at this problem, this paper again by changing the training sequence structure, puts forward the improved synchronization algorithm, consider the impact of the correlation coefficient on timing synchronous, by an estimate of the correlation coefficient, reducing the factors that affect the performance of the ML timing synchronization algorithm; in the frequency offset estimation, using the set of related ideas to eliminate the drawbacks of ML algorithm performance in multipath channel low, through the simulation verified the effectiveness of the algorithm.

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Section: Improved Timing Estimation Algorithm and Simulation Analmentioning

confidence: 99%

OFDM Synchronization Improved Algorithm Based on Cyclic Prefix

Zhang¹,

Chen²,

Zhang³

2015

Proceedings of the International Conference on Computer Information Systems and Industrial Applications

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“…In particular, OFDM together with coherent detection is regarded as a major concern in future high speed and long distance optical transmission systems [1][2]. It is robust to chromatic dispersion (CD) and polarization mode dispersion (PMD) [3].…”

Section: Introductionmentioning

confidence: 99%

Physical Layer Impairment Model for CO-OFDM System Considering Amplified Spontaneous Emission and Four-wave Mixing

Meng

Chai

et al. 2015

Journal of Optical Communications

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It's known that different physical impairments can occur in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system. Not only linear impairments but also nonlinear impairments can cause significant signal degradations. It is important to analyze the physical layer impairment (PLI) model which should consider these impairments. In this paper, a new PLI model is developed, where amplified spontaneous emission (ASE) categorized to linear impairments and four-wave mixing (FWM) categorized to nonlinear impairments are regarded as the main noise sources. The performance of developed PLI model in terms of Q factor versus number of subcarriers and Q factor versus fiber length are extensively simulated. Numerical results show that when the OFDM signal passes through fiber link, the noise power expansion occurs. This expansion which is related to the fiber length, number of subcarriers as well as input power, can cause higher degradation in OFDM signal. Through precise analysis, optimum parameters of the transmission system can be chosen. Simulations prove that Q factor of CO-OFDM, whose number of subcarriers is 128, fiber length is 90 km and input power is −2 dBm, is up to abound 10 dB. In addition, in order to verify the developed PLI model, comparisons of the situation with and without considering FWM effects have also been made respectively. Results show that the performance of the model conforms to the actual conditions.

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“…However, integrating WDM with CO-OFDM will produce a system with high spectral efficiency; better tolerance to PMD and CD; and, significantly high data rate. Because of the great potential of CO-OFDM, it is considered the solution to upgrade todays' 10 Gbits/s transmission rate to over 100 Gbits/s [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Performance Study of 1 Tbits/s WDM Coherent Optical OFDM System

Alatawi¹,

Almasoudi²,

Matin³

2013

OPJ

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This paper investigates the architecture of Tbits/s Wavelength Division Multiplexing (WDM) system by using a Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) with 4-QAM for long haul transmissions of 1800 Km SM. A simulation of 20 WDM channels spaced at 50 GHz, and 20 OFDM signals each with 50 Gbits/s bitrate to produce data rate of 1 Tbits/s is built. The system performance is studied by observing the constellation diagram of the signal and the relationship of BER and OSNR with regard to transmission distance. The results show that the BER increases as the transmission distance increases. Also, as the transmission distance increases, the OSNR needs to be increased to maintain BER in less than 10^-3.

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Performance evaluation of (D)APSK modulated coherent optical OFDM system

Cited by 8 publications

References 24 publications

OFDM Synchronization Improved Algorithm Based on Cyclic Prefix

OFDM Synchronization Improved Algorithm Based on Cyclic Prefix

Physical Layer Impairment Model for CO-OFDM System Considering Amplified Spontaneous Emission and Four-wave Mixing

Performance Study of 1 Tbits/s WDM Coherent Optical OFDM System

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