Practical investigation of suitable decoding techniques for spectral amplitude coding optical code division multiple access‐based vibration sensing

Taiwo, Ambali; Moghaddasi, Majid; Kuje, Danjuma; Idriss, Yahaya; Mokhtar, M. M.

doi:10.1049/iet-opt.2015.0125

Cited by 5 publications

(5 citation statements)

References 20 publications

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“…(11) is the common BER equation for optical PPM-CDMA systems and it's also valid for our proposal system based on both DS and SAC schemes, except that the desired signal parameter (i.e., 1 n S and m n S ) will be totally different. The following subsections present the analysis of proposal systems in terms of 1 n S ; m n S and the total interference, given in Eq (18) and Eq (33).…”

Section: Performance Analysismentioning

confidence: 99%

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Performance Enhancement of Optical PPM-CDMA Using Successive Interference Cancellation Scheme

Alsowaidi

Eltaif

Mokhtar

2018

IRECAP

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A comprehensive mathematical model of Successive Interference Cancellation (SIC) using Direct Sequence (DS) and Spectral Amplitude Coding (SAC), which is employed in incoherent optical CDMA using On-Off Keying (OOK) Pulse Position Modulation (PPM) and On-Off Keying (OOK) considering the presence of Phase-Induced Intensity Noise (PIIN), shot noise and thermal noise is presented in this work. SIC scheme has the potential to suppress Multiple Access Interference (MAI). The concept of SIC is the following: detection is taken place in successive stages where the most reliable symbols are chosen at each stage. Where the interference contributed by the already detected symbols will be removed. It has been found out that, theoretically, the size of M-ary on optical CDMA system limits the MAI effect. Thus, the system performance improves with the increasing of M-ary PPM. Hence, the system using PPM has better performances if compared to the one using OOK, due to a lower average number of interfering optical pulses. In addition, a lot of users can be accommodated with SIC/SAC-optical CDMA based PPM signaling system instead of the SIC/SAC-optical CDMA based OOK one.

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Section: Performance Analysismentioning

confidence: 99%

“…, while the second imperfect cancellation noise and signal noise are the second and third term respectively, by substituting Eq (18) into Eq (11) the BER of system can be measured.…”

Section: Ii2 Performance Analysis Of Optical Cdma Systemmentioning

confidence: 99%

Performance Enhancement of Optical PPM-CDMA Using Successive Interference Cancellation Scheme

Alsowaidi

Eltaif

Mokhtar

2018

IRECAP

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“…The performance of DDW codes was studied analytically to raise the presentation and cardinality of SAC-OCDMA systems in Malaysia. 36 BER results revealed that single photodetector in DDW provides good performance. MDW codes were introduced by the enhancement of DDW codes as presented in Ref.…”

Section: Introductionmentioning

confidence: 98%

Review on developments in all-optical spectral amplitude coding techniques

Kaur

Singh

2018

Opt. Eng.

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The focus of this work is to consolidate a review of accomplished research in the field of optical code division multiple accesses (OCDMA), to outline the state-of-the-art comparison, and to recognize the prominent trends as well as limitations. Code division multiple access (CDMA) has prospered as a vital solution for numerous applications such as cellular mobile communication-based wireless network technology and wired/wireless local area networks that include areas of unlicensed industry, medicine, and science. Due to the commercial utilization of the various advantages of CDMA, it has raised the matter of whether optical technology reliant communications provide the noteworthy advantages to optical networks as well as what are the technologies that facilitate optical chip-based (code division) networks. Aforementioned matter has been addressed in the context of the incorporation of OCDMA in the systems through several experiments of laboratory-based test-bed investigations, field trials, and simulation analysis of multiple users in the recent research works. The performance of OCDMA has an edge over wavelength division multiplexing and offers an unmatched capacity that is seen through simulations. To cater the explosive expansions in internet application, different spectral amplitude codes have been proposed till now. We present a review of the different spectral amplitude codes based on the reported works in spectral amplitude code OCDMA systems. For the purpose of state-of-the-art comparison, parameters considered are data speeds, advanced modulation formats, bit error rate, extinction ratio, decision algorithms, photonic efficiencies of photodetectors, frequency bands, signal-to-noise ratio, forward error correction, photodetector noises, etc., and simulations are carried out in similar input environments. We explore the advantages/limitations of the spectral amplitude codes, recent progress in the technology, practical works on spectral amplitude coding (SAC) throughout the world, encryption-decryption techniques, all-optical methods, literature comparison, future scope, and applications of the SAC-OCDMA codes.

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“…Other features are the flexibility of adding and removing users in the network and the transparency in different modulation formats. Based on the above characteristics, OCDMA has been employed in a wide range of optical applications, such as metro area networks (MANs) [6], radio-of-fiber (RoF) [7], passive optical networks (PONs) [8], and optical fiber sensors [9]. Each active user expresses the information bits as a unique code sequence.…”

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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Practical investigation of suitable decoding techniques for spectral amplitude coding optical code division multiple access‐based vibration sensing

Cited by 5 publications

References 20 publications

Performance Enhancement of Optical PPM-CDMA Using Successive Interference Cancellation Scheme

Performance Enhancement of Optical PPM-CDMA Using Successive Interference Cancellation Scheme

Review on developments in all-optical spectral amplitude coding techniques

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

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