Optical CDMA Networks

Ghafouri‐Shiraz, H.; Karbassian, M. Massoud

doi:10.1002/9781119941330

Cited by 95 publications

(23 citation statements)

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“…[5], ‫)݂(ܩ‬ represents the single sideband power spectral density (PSD); ܶ is the absolute receiver noise temperature; ‫ܭ‬ is the Boltzmann's constant and ܴ is the receiver load resistor. Based on the above mentioned assumptions, the received optical signals ‫)ݒ(ݎ‬ can be expressed as [20]:…”

Section: Code Evaluation and Comparisonmentioning

confidence: 99%

Performance Analysis of Two New Code Families for Spectral-Amplitude-Coding Optical CDMA Systems

Shi

Ghafouri‐Shiraz

2016

J. Lightwave Technol.

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Abstract──In this paper, we have proposed two new 1-D code families for spectral amplitude coding optical code-division multiple-access (SAC-OCDMA) systems. They are referred to as (i) partitioned diagonal code (PDC) and (ii) partitioned modified quadratic congruence code (PMQCC). Simulation results show that both of codes can reduce phase-induced intensity noise (PIIN) and support more active users as compared with MQC. Our results show that for similar code length PDC and PMQCC can support 11% and 14%, respectively, more simultaneous users as compared with MQC. Also at each synchronous time, the auto-correlations of PDC and PMQCC reach to their peak values and their cross-correlations remain one. Index Terms-Spectral amplitude coding (SAC), optical code-division multiple-access (OCDMA), phase-induced intensity noise (PIIN), partitioned diagonal code (PDC), partitioned MQC code (PMQCC).

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Section: Code Evaluation and Comparisonmentioning

confidence: 99%

Performance Analysis of Two New Code Families for Spectral-Amplitude-Coding Optical CDMA Systems

Shi

Ghafouri‐Shiraz

2016

J. Lightwave Technol.

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“…Although OCDMA systems can potentially provide very high data rates, these systems suffer from multi access interference (MAI) [6]. MAI mitigation is a crucial part of any OCDMA detection design.…”

Section: Introductionmentioning

confidence: 99%

“…MAI mitigation is a crucial part of any OCDMA detection design. Different OCDMA schemes have dealt with MAI mitigation in different ways ranging from simple passive approaches to highly complex coherent procedures [6]. A simple and low cost OCDMA scheme that cancels the MAI at the mean is known as spectral amplitude coding (SAC) OCDMA [7].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Performance of Coherent Sources SAC OCDMA Networks via Spatial Multiplexing

Alhassan¹,

Badruddin²,

Saad³

et al. 2013

Journal of the Optical Society of Korea

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The beating of two or more lasers that have the same or a finite difference in the central frequencies, is the main source of noise in spectral amplitude coding optical code division multiple access (SAC OCDMA) systems. In this paper we adopt a spatial multiplexing (SM) scheme for SAC OCDMA systems to mitigate this beat noise. The results show that for different code weights and different data rates SM SAC can support a larger number of users than the conventional SAC for all different laser source configurations. However, SM SAC requires a more complex system than the conventional SAC, and almost twice as much optical component.

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“…In an OCDMA system, different users share a common communication medium, thus multiple access is achieved by assigning OCDMA codes to different users [30]. Therefore, the transmitted signal for user i can be described as An important type of OCDMA code is the optical orthogonal code (OOC) that was proposed for intensity modulation and direct-detection (IM-DD) optical CDMA (OCDMA) systems [24].…”

Section: Optical Cdmamentioning

confidence: 99%

“…where c i is the ith codeword, and There is a special case of λ a = λ c = λ that the OOC is represented by (L, w, λ) [30]. Table 4.1 gives us examples for codeword indexes (the positions of the "ones" in the codeword).…”

Section: Optical Cdmamentioning

confidence: 99%

Multiuser MISO Indoor Visible Light Communications

Lian

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indoor VLC systems and consider the one user case using an M-ary pulse amplitude modulation (M-PAM) scheme. On that basis, we then focus on the multiuser case, for which we propose a power allocation joint optimization (PAJO) algorithm that maximizes the minimum signal to interference pulse noise ratio (SINR) of all users.We design a minimum mean square error (MMSE) filter to be used at the receiver of each user. Using simulation results, we show that our proposed PAJO has better BER performance than previous proposed methods while satisfying the illumination requirements for all users in this system.

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Optical CDMA Networks

Cited by 95 publications

References 0 publications

Performance Analysis of Two New Code Families for Spectral-Amplitude-Coding Optical CDMA Systems

Performance Analysis of Two New Code Families for Spectral-Amplitude-Coding Optical CDMA Systems

Enhancing the Performance of Coherent Sources SAC OCDMA Networks via Spatial Multiplexing

Multiuser MISO Indoor Visible Light Communications

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