An efficient MAI cancellation technique in Optical CDMA

Hussein, G.A.M.; El-atty, Saied M. Abd; Oraby, Osama A.; Mohamed, Azza H.; Elkorany, Ahmed S.; El-Dokany, Ibrahim M.; Dessouky, Moawad I.; El-Rabaie, El-Sayed M.; Alshebeili, Saleh A.; El‐Samie, Fathi E. Abd

doi:10.1016/j.ijleo.2013.12.034

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…Despite all these advantages, OCDMA systems suffer from multi‐access interference (MAI) [9–11]. The latter is a result of the lack of orthogonality between the spreading code sequences due to asynchronous transmission.…”

Section: Introductionmentioning

confidence: 99%

Projected block‐wise PIC detection for communication systems with non‐negativity constraints

Bentrcia

2019

IET Communications

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Section: Introductionmentioning

confidence: 99%

Projected block‐wise PIC detection for communication systems with non‐negativity constraints

Bentrcia

2019

IET Communications

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“…As PIIN is proportional to the square of the received power, launching a large-intensity light source cannot mitigate this effect. Modifying the decoder structure has become one of the leading solutions to noise suppression in OCDMA [17][18][19]. In Reference [20], rather than balanced detection with two photodiodes, a multiphotodiode scheme was proposed.…”

Section: Introductionmentioning

confidence: 99%

Advancing High-Speed Transmissions over OCDMA Networks by Employing an Intelligently Structured Receiver for Noise Mitigation

Chen

Liao

2018

Applied Sciences

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We propose an intelligently structured receiver to achieve high-speed transmissions over optical code-division multiple access (OCDMA) networks. Employing spectral-amplitude coding (SAC) reduces multiuser interference (MUI) in OCDMA, but the network bit-rate is limited by phase-induced intensity noise (PIIN) coming from the incoherency of light sources. To mitigate PIIN, the receiver performs interference estimations and regenerations through consecutive stages. The MUI is removed by subtracting the estimated interference term from the received multiplexed signals. For PIIN variance, it is both dependent on and positively related to user number and bit-rate. Reducing the number of interference users allows the network to support transmissions with a higher speed under a given noise level. The proposed scheme has the advantages of all-optical signal processing and a compact structure. Additionally, the function of noise suppression is rarely studied in the existing MUI elimination schemes, such as serial interference cancellation (SIC) and parallel interference cancellation (PIC). The simulation results show the proposed receiver achieves significant increment in bit-rate than the conventional balanced detector in SAC–OCDMA networks.

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“…Optical code-division multiple-access (OCDMA) has been considered as a viable option for implementing the nextgeneration optical access networks because of its attractive properties, such as high-level security during transmission, flexibility in code design, and possibility of plug and play functionality [1,2]. Unfortunately, OCDMA systems pose the crucial disadvantage of multiple-access interference (MAI), which restricts the number of concurrent subscribers and creates an asymptotic floor to the bit-error rate (BER) [3,4]. Recently, there has been increasing at dramatic rates of concern in spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA) systems due to mitigating abilities of MAI and cost savings [5,6].…”

Section: Introductionmentioning

confidence: 99%

Spectrally Efficient SAC-OCDMA System Using a New Two-Code Keying Scheme

Al-Khafaji¹,

Ngah²,

Mousa³

et al. 2016

IJICS

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This paper introduces a new two-code keying scheme for increasing the spectral efficiency (SE) of spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA) system. The analytical expression is derived for the SE of SAC-OCDMA system based on the proposed scheme utilizing multi-diagonal (MD) code. The theoretical results demonstrate that the suggested scheme has an improved SE performance over the conventional unipolar encoding with direct detection technique. This SE enhancement is verified in simulation experiments.

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An efficient MAI cancellation technique in Optical CDMA

Cited by 6 publications

References 18 publications

Projected block‐wise PIC detection for communication systems with non‐negativity constraints

Projected block‐wise PIC detection for communication systems with non‐negativity constraints

Advancing High-Speed Transmissions over OCDMA Networks by Employing an Intelligently Structured Receiver for Noise Mitigation

Spectrally Efficient SAC-OCDMA System Using a New Two-Code Keying Scheme

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