Blind Modulation Format Recognition for Orthogonal Frequency Division Multiplexing-Based Elastic Optical Networking

AbstractThis paper focuses on designing of a 10 Gbit/s-10GHz hybrid Orthogonal frequency division multiplexing (FDM) based Radio over Free Space Optics (Ro-FSO) transmission link using optical single sideband modulation format and its performance has been compared using a different number of transmission beams. The proposed link has been simulated and compared using 1-beam, 2-beam, and 4-beam in the system. We show that by using the 4-beam system in the OFDM-Ro-FSO link, a 3000 m range has been achieved reliably, which a notable improvement when compared to previous work is. Also, we show an improved performance of the system by using an enhanced detection mechanism using a Square root module (SRm) at the receiver side.

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PAPR Reduction in Coherent Optical OFDM System using Modified Sliding Norm Transformer

Iraqi Journal of Computer Communication Control and System Engineering ◽

10.33103/uot.ijccce.18.3.4 ◽

2018 ◽

pp. 33-42

Keyword(s):

Optical Communication ◽

Orthogonal Frequency Division Multiplexing ◽

Side Information ◽

Average Power ◽

Cumulative Distribution ◽

Frequency Division Multiplexing ◽

Power Ratio ◽

Frequency Division ◽

Modulation Format ◽

High Spectral Efficiency

Orthogonal Frequency Division Multiplexing is one of the most important multiple carrier modulation format, which has many applications in wireless communication and optical communication. It is considered as an excellent method for fast optical communication inferable from its high spectral efficiency and its strength to path losses. Peak to average power ratio is regarded as one of the main problems that are experienced by the optical orthogonal frequency division multiplexing system, which directly affects the characteristics of the system. The current paper proposes an efficient technique to reduce Peak to Average Power Ratio by the modified Dursun’s method or the so called modified discrete sliding norm transformer in coherent optical orthogonal frequency division multiplexing system for the first time to the base of our knowledge consequently. The proposed technique does not need to send side information to the receiver; also, it does not degrade bandwidth. This algorithm lessens Peak to Average Power Ratio in the optical coherent Orthogonal Frequency Division Multiplexing system to about 4.15 dB at complementary cumulative distribution function (CCDF) probability of 10-3 and improves the system performance.

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Investigation of Coded WOFDM System over Multimode Optical Channels

Journal of Communications ◽

10.12720/jcm.15.8.619-625 ◽

2020 ◽

pp. 619-625

Author(s):

Farhad Sadeghi Almaloo ◽

◽

Majid Zarie ◽

Mahdi Akbari Allah Abadi ◽

Ghader Mohammadi Aghdash

Keyword(s):

Performance Improvement ◽

Communication System ◽

Orthogonal Frequency Division Multiplexing ◽

Wavelet Packet ◽

Optical Channel ◽

Frequency Division Multiplexing ◽

Frequency Division ◽

Ofdm System ◽

Modulation Format ◽

Simulation Results

In this paper, the performance of Asymmetrically Clipped Optical Wavelet based Orthogonal Frequency Division Multiplexing (ACO WOFDM) system is compared to the performance of Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing (ACO OFDM) system. Then a Coded ACO WOFDM (CACO WOFDM) communication system over a multimode optical channel is investigated. The used wavelet transform is the Wavelet Packet Transform (WPT). Quadrature Amplitude Modulation (QAM) is used as the modulation format. The simulation results show a considerable performance improvement of ACO WOFDM system in terms of BER and slight performance improvement of ACO WOFDM system in terms of OSNR Compared to the ACO OFDM system. Also, from the simulation results, we find that the CACO WOFDM considerably improves the BER and OSNR performance of the communication system.

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