A Projected Parallel Interference Cancellation for Asynchronous Upstream OCDMA-PON

Overlapping pulse position modulation -optical code division multiple access (OPPM-OCDMA) is a well known technique to enhance spectral efficiency and to increase the number of effective users in the system. However, on the other hand overlapping may result in increasing levels of multiple access interference (MAI) that significantly reduces the capacity of the system. To mitigate MAI, we make use of a recently proposed parallel interference cancellation (PIC) technique that exploits the non-negativity of the incoherent direct detection OPPM-OCDMA system to boost its performance. Simulation results reveal a considerable increase in the spectral efficiency of the system.

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“…To solve the optimization problem in (9), we employ the projected PIC detector [8]. The update equation is described by:…”

Section: System Modelmentioning

confidence: 99%

“…Recently, a projected PIC (PPIC) detector [8] that exploits the non-negativity of the solution has been proposed for OOK-OCDMA system. Since the solution in OPPM-CDMA systems is also non-negative, the projected PIC detector can be used to reduce the large amount of MAI expected in OPPM-CDMA systems.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of asynchronous overlapping PPM-OCDMA systems using projected PIC multiuser detection

Seleem

Fathallah

Bentrcia

2013

2013 Saudi International Electronics, Communications and Photonics Conference

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“…As the MUI cancellation problem has been investigated in detail for wireless CDMA, such schemes have also been introduced in OCDMA networks [28]. Due to the non-negativity of the optical intensity, a modified parallel interference cancellation (PIC) is proposed to suit this inherent property of the optical signals [29]. Compared to the existing balanced detection, these studies yield better performance to some extent, but some bottlenecks still require further investigation-for example, the limited user numbers, the ineffectiveness in performance improvement, and the time delay resulting from the processing of the electrical signals.…”

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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“…Parallel Interference Cancellation (PIC) is effective to mitigate the effect of MAI and improve the performance of the system [5]. However, the research on existing OCDMA systems almost focus on multi-user detection algorithm with constant-weight OOC.…”

Section: Introductionmentioning

confidence: 99%

Performance of Parallel Interference Cancellation Scheme in VW-OCDMA Systems

Liang¹,

Li²,

Zhang³

et al. 2016

IJFCC

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Abstract-To support multi-service and guarantee quality of service, variable-weight code is needed in OCDMA system. However, such codes suffer from high cross-correlation products which create high multiple access interference (MAI) that significantly reduces the capacity of the system. To mitigate MAI, In this paper, we study the Parallel Interference Cancellation (PIC) receiver efficiency in Variable-Weight OCDMA (VW-OCDMA). We develop the analytical expression of the error probability with variable-weight optical orthogonal code for one stage PIC receiver. Furthermore, the system has been tested for five users. Simulation results show that by using PIC receiver we obtain good performance in VW-OCDMA system, and the highest priority user can be assigned to a codeword with the largest weights to guarantee the lowest bit error rate.Index Terms-OCDMA, variable-weight optical orthogonal codes, multiple access interference, parallel interference cancellation.

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A Projected Parallel Interference Cancellation for Asynchronous Upstream OCDMA-PON

Cited by 18 publications

References 6 publications

Performance enhancement of asynchronous overlapping PPM-OCDMA systems using projected PIC multiuser detection

Performance enhancement of asynchronous overlapping PPM-OCDMA systems using projected PIC multiuser detection

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

Performance of Parallel Interference Cancellation Scheme in VW-OCDMA Systems

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