A modified topology achieved in OFDM/SAC-OCDMA-based multi-diagonal code for enhancing spectral efficiency

Yousif, Bedir; El.Metwally, ibrahim; Samra, Ahmed S.

doi:10.1007/s11107-018-0796-2

Cited by 9 publications

(3 citation statements)

References 12 publications

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“…Boltzmann's constant 1.38 × 10 −23 J/K Meanwhile, the MD codes show the same performance compared to the ZCC codes. This behaviour because the only difference between those codes is the arrangement of the ones where both codes give better performance with comparison to other types of SAC-OCDMA codes [14], [15]. In addition, Figure (4) shows that the higher number of weight, the better performance of the system as this can be seen with 1D-MD W=1 compared to 1D-MD W=4.…”

Section: Performance Analysis Of Ocdma Systemmentioning

confidence: 91%

Evaluation Performance of Two-Dimensional Multi-Diagonal Code Using Polarization and Wavelength of OCDMA System

Dhaam

Ali

Wadday

2020

Al-Furat Journal of Innovations in Electronics and Computer Engineering

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In this paper, a new encoder/decoder technique has employed two orthogonal polarization states (vertical and horizontal) of a two-dimensional optical code, which combined polarization and wavelength scheme (p/w). This technique employed in order to increase the number of users in the FTTH network. In addition, Optical Fiber Systems (OFS) and Free Space Optics (FSO) scenarios were utilized with different Spectral Amplitude Coding Optical Code Division Multiple Access (SAC-OCDMA) codes. The FTTH network based on incoherent SAC-OCDMA is tested by using the One and Two Dimensional Multi-Diagonal (1D-MD, 2D-MD) codes and 1D and 2D Zero Cross Correlation (ZCC) codes. The results show that the number of the total supported homes for the 2D codes is doubled as a comparison with 1D codes. As well as, the simulation results show the performance of MD code is better presented than ZCC in both OFS and FSO scenarios.

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Section: Performance Analysis Of Ocdma Systemmentioning

confidence: 91%

Evaluation Performance of Two-Dimensional Multi-Diagonal Code Using Polarization and Wavelength of OCDMA System

Dhaam

Ali

Wadday

2020

Al-Furat Journal of Innovations in Electronics and Computer Engineering

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“…Orthogonal frequency division multiplexing (OFDM) has dominated wireless communication systems such as long-term evolution (LTE) networks, and also represents a future solution for 5G (Cai et al 2018), because of its high spectral e ciency, robustness against delay, and increasing transmission rate through M-ary modulation of subcarriers like phase-shifted-keying (PSK) or quadrature amplitude modulation (QAM). In addition to the previously described advantages of the OCDMA/WDM system, the use of OFDM in this system provides robustness to fading and multipath channels and the ability to overcome the multi-access interface and multipath dispersion (Armstrong 2009), (Nawawi et al 2018;Yousif et al 2018), which re ect the specter e ciency.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the performance of a coherent SAC-OCDMA–OFDM–DWDM system using a flat optical frequency comb generator for multiservice networks

et al. 2022

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A SAC-OCDMA-OFDM-DWDM system using a at optical frequency comb generator and a coherent communication system is proposed in this research. The objective is to develop a novel OCDMA communication system that is appropriate and dedicated to multiservice networks. A comparison between the two codes, EDW and RD, has been presented. It has been concluded that the RD code system has better performance in terms of robustness and number of users than the EDW code. By analyzing the BER for several symbol rates and comparing it to the pre-FEC threshold, the proposed system demonstrates its effectiveness against linear and nonlinear effects. Performance evaluation of the proposed system is carried out via co-simulation of OptiSystem and MATLAB.

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“…The effectiveness of classical optical code-division multiplexing access (OCDMA) can be potentially improved by employing orthogonal frequency-division multiplexing (OFDM) with high-order quadrature amplitude modulation (QAM) in order to increase the spectral efficiency and signal capacity, while overcoming linear fiber impairments by simplified digital signal processing. In the state of the art, various hybrid systems based on 2D codes are proposed for OCDMA-PON, intensity modulation and direct detection OFDM-OCDMA (IM/DD OFDM-CDMA) [15,16], coherent optical OFDM-CDMA (CO-OFDM-CDMA) [17] and OFDM-SAC-OCDMA systems [18,19].…”

Section: Introductionmentioning

confidence: 99%

A Performance Analysis of a Hybrid OCDMA-PON Configuration Based on IM/DD Fast-OFDM Technique for Access Network

Mrabet

2020

Applied Sciences

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The purpose of this article is to propose a new configuration based on OCDMA and Fast-OFDM techniques for access network applications. A hybrid intensity modulation with direct detection, fast orthogonal frequency-division multiplexing–code division multiplexing access (IM/DD Fast-OFDM-CDMA) system is analytically and numerically evaluated for an amplifier-free access network. Therefore, system performance is analytically investigated in terms of bit error rate/Q-factor as a function of simultaneous users, fiber length and launched optical power. Firstly, the proposed analytical model includes the overlapping effect among OFDM subcarriers, the peak-to-average power ratio (PAPR), and multiple access interference (MAI). Secondly, a simulation setup is performed, allowing four simultaneous users operating at 40 Gb/s in a passive optical network (PON) context. Furthermore, a power budget analysis is made between IM/DD Fast-OFDM-CDMA, all-optical IM/DD OFDM-CDMA (IM/DD AO-OFDM-CDMA) and OCDMA wavelength division multiplexing (OCDMA-WDM) configurations. It is shown that at 40 Gb/s and by using 2D-hybrid coding (2D-HC), the maximum achievable transmission-reach of IM/DD Fast-OFDM-CDMA is 142 km, which is 34 km and 60 km higher than those provided by the IM/DD AO-OFDM-OCDMA and OCDMA-WDM PON configurations, respectively.

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A modified topology achieved in OFDM/SAC-OCDMA-based multi-diagonal code for enhancing spectral efficiency

Cited by 9 publications

References 12 publications

Evaluation Performance of Two-Dimensional Multi-Diagonal Code Using Polarization and Wavelength of OCDMA System

Evaluation Performance of Two-Dimensional Multi-Diagonal Code Using Polarization and Wavelength of OCDMA System

Analysis of the performance of a coherent SAC-OCDMA–OFDM–DWDM system using a flat optical frequency comb generator for multiservice networks

A Performance Analysis of a Hybrid OCDMA-PON Configuration Based on IM/DD Fast-OFDM Technique for Access Network

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