Design and performance of 2-D codes for wavelength-time optical CDMA

Yim, R.; Chen, Lawrence R.; Bajcsy, J.

doi:10.1109/68.998735

Cited by 101 publications

(36 citation statements)

References 9 publications

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“…(11). In this equation, the coordinates of p obtained in step 3 are (1.2), (1,3), (1, 4) (1, 5) (2, 6) (2, 7) (2, 8) (3, 9) (3, 10) and (4, 1) while the coordinates of q obtained in step 4 are (2,2), (3,3), (4,4), (5,5), (3,6), (4,7), (5,8), (4,9), (5,10), and (5,1) . It should be pointed out that, all these coordinates represent the positions of -1s‖ whereas the positions of -0s‖ calculated by using step 6.…”

Section: Code Examplesmentioning

confidence: 99%

“…Step4: Calculate p using (7) For r =1 and m = 2, p = ( Step 5: Calculate q using (8) For r = 1, M 1 = 2 and m = 2, 3, 4, 5.…”

Section: Code Examplesmentioning

confidence: 99%

“…Step 4: Calculate the position of -1s‖ in the first row of each block using ) , ( m r p  (8) Step 5: Calculate the positions of cross-correlated -1s‖ in each block using…”

Section: B Construction Steps Of Csac Code Familymentioning

confidence: 99%

“…Among all of them temporal/spatial OCDMA networks to improve autocorrelation sidelobes and cross-correlation have been proposed in [7]. Applying an optical pulse to represent one chip in the wavelength and time domain is one way of the MAI improvement schemes [8][9][10]. Some proposals [11][12][13] have employed differential detection to reduce the MAI.…”

Section: Introductionmentioning

confidence: 99%

“…This eventually limits the network capacity. Several schemes have been introduced to be combined with OCDMA technique to improve the MAI cancellation and support more users in fiber optical networks [7][8][9][10][11][12][13]. Among all of them temporal/spatial OCDMA networks to improve autocorrelation sidelobes and cross-correlation have been proposed in [7].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

An Inclusive Comparison in LAN Environment between Conventional and Hybrid Methods for Spectral Amplitude Coding Optical CDMA Systems

Ahmed¹,

K.S²,

Gharsseldien³

et al. 2016

ijacsa

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Abstract-In this paper, performance analysis of conventional spectral amplitude coding (CSAC) with hybrid (HSAC) for OCDMA system is investigated in local area network (LAN) environment. The CSAC is built based on arithmetic sequence with simple algebraic ways. The HSAC technique is used in which spectral amplitude coding (SAC) combined with wavelength division multiplexing (WDM) to effectively reduce multiple access interference (MAI) and mitigate the influence of phase induced intensity noise (PIIN) arising in photodetecting process. The main idea is to construct the code sequences in SAC domain then repeat it diagonally in the wavelength domain as groups which maintains the same cardinality of a given code weight. Results show that HSAC outperforms CSAC when the number of active users is high due to its better correlation properties. It has been shown that the HSAC can suppress intensity noise effectively and improve the bandwidth utilization significantly up to 4.2 nm.

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Section: Code Examplesmentioning

confidence: 99%

“…Step4: Calculate p using (7) For r =1 and m = 2, p = ( Step 5: Calculate q using (8) For r = 1, M 1 = 2 and m = 2, 3, 4, 5.…”

Section: Code Examplesmentioning

confidence: 99%

“…Step 4: Calculate the position of -1s‖ in the first row of each block using ) , ( m r p  (8) Step 5: Calculate the positions of cross-correlated -1s‖ in each block using…”

Section: B Construction Steps Of Csac Code Familymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An Inclusive Comparison in LAN Environment between Conventional and Hybrid Methods for Spectral Amplitude Coding Optical CDMA Systems

Ahmed¹,

K.S²,

Gharsseldien³

et al. 2016

ijacsa

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Performance of OCDMA system with FEC based on interference statistical distribution analysis

Sahuguède

Julien-Vergonjanne

Cances

2009

Trans Emerging Tel Tech

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International audienceThe optical code division multiple access (OCDMA) technique has been investigated for several years as a promising alternative to provide multiple access in high speed optical networks. However, due to the use of binary on off keying (OOK) modulation, an inherent main performance limitation is multiple access interference (MAI), following a specific distribution. In order to reduce errors induced by MAI, it is necessary to take into account this specific statistic when applying forward error correction (FEC) with soft decision decoding. In this paper, we analyse the MAI distribution in order to determine FEC soft decoding calculation rules. The study is performed for a low density parity check (LDPC) code scheme over an OCDMA system using two-dimensional (2-D) OCDMA spreading codes. The a priori information required for soft decoder initialisation is calculated according to the specific OCDMA channel statistic. The enhancement provided by the decoding algorithm adaptation confirms that it is important to take into account the specific MAI distribution as described in this paper. Finally, we show that, despite the loss of available data rate linked to the addition of redundancy, the data rates per user can significantly be increased thanks to this efficient error correction scheme. Copyright © 2009 John Wiley & Sons, Ltd

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Codes for Optical CDMA

Omrani

Kumar

2006

Sequences and Their Applications – SETA 2006

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Design and performance of 2-D codes for wavelength-time optical CDMA

Cited by 101 publications

References 9 publications

An Inclusive Comparison in LAN Environment between Conventional and Hybrid Methods for Spectral Amplitude Coding Optical CDMA Systems

An Inclusive Comparison in LAN Environment between Conventional and Hybrid Methods for Spectral Amplitude Coding Optical CDMA Systems

Performance of OCDMA system with FEC based on interference statistical distribution analysis

Codes for Optical CDMA

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