Wavelength hopping/time spreading codedivision multiple access systems

Tancevski, L.; Andonović, Ivan

doi:10.1049/el:19940942

Cited by 161 publications

(83 citation statements)

References 3 publications

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“…Nevertheless, incoherent OCDMA systems exhibit drawbacks such as limited code size, low bandwidth efficiency, and relatively poor auto-and crosscorrelation characteristics [3][4][5]. The relatively poor characteristics of the incoherent 1-D OCDMA networks can be improved in 2-D incoherent OCDMA systems in which the coding operation is performed both in temporal and spectral domains [6][7][8]. Further improvement of the characteristics in terms of correlation property, frequency efficiency, capacity, security, and dispersion can be obtained in 2-D coherent OCDMA systems.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of Two-Dimensional OCDMA En/Decoder Composed of Double Ring Add/Drop Filters and Delay Waveguides

Chung

2016

Journal of the Optical Society of Korea

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A two-dimensional optical code division multiple access (OCDMA) en/decoder composed of four double-ring resonator add/drop filters and three delay waveguides is designed, and a transfer matrix method combined with fast Fourier transform is implemented to provide numerical simulations for the en/decoder. The auto-correlation peak level over the maximum cross-correlation level is larger than 3 at the center of the correctly decoded pulse for most of wavelength hopping and spectral phase code combinations, which assures the BER lower than 10 -3 which corresponds to the forward error correction limit.

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Section: Introductionmentioning

confidence: 99%

Design and Simulation of Two-Dimensional OCDMA En/Decoder Composed of Double Ring Add/Drop Filters and Delay Waveguides

Chung

2016

Journal of the Optical Society of Korea

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“…The added columns to the code always contain "0"s. To minimize the number of time slots, Mendez and co-workers [8], [18] determined that a GT of four time slots provides optimum performance improvement, with simulations showing that this allows the system to support up to 16 users, and 32 users with the addition of optical hard limiting before the thresholder [19]. Unlike other 2-D codes [6], [7], [9], the Golomb-ruler-based codes allow multiple pulses to share the same wavelengths (code 1), the same time slot (code 9), or both (code 7). In turn, this allows our code to use less bandwidth and time slots than codes of equivalent cardinality, inclusive of the GT.…”

Section: -D Code Descriptionmentioning

confidence: 99%

Simple robust receiver structure for gigabit ethernet O-CDMA using matrix codes

Hernandez

Mendez²,

Bennett³

et al. 2005

J. Lightwave Technol.

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“…The system uses time/wavelength-coded O-CDMA 12 , whereby each encoded signal is represented as a sequence of multi-wavelength pulses. We specifically use a time/wavelength code set derived from folded optimum Golomb rulers 13 and base the simulator architecture on an actual technology demonstrator 14 .…”

Section: Simulation Descriptionmentioning

confidence: 99%

Design and evaluation of a virtual quadrant receiver for 4-ary pulse position modulation/optical code division multiple access (4-ary PPM/O-CDMA)

Mendez¹,

Hernandez

Gagliardi

et al. 2007

SPIE Proceedings

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M-ary pulse position modulation (M-ary PPM) is an alternative to on-off-keying (OOK) that transmits multiple bits as a single symbol occupying a frame of M slots. PPM does not require thresholding as in OOK signaling, instead performing a comparison test among all slots in a frame to make the slot decision. Combining PPM with optical code division multiple access (PPM/O-CDMA) adds the benefit of supporting multiple concurrent, asynchronous bursty PPM users. While the advantages of PPM/O-CDMA are well known, implementing a receiver that performs the comparison test can be difficult. This paper describes the design of a novel array receiver for M-ary PPM/O-CDMA (M = 4) where the received signal is mapped onto an xy-plane whose quadrants define the PPM slot decision by means of an associated control law. The receiver does not require buffering or nonlinear operations. In this paper we describe a planar lightwave circuit (PLCs) implementation of the receiver. We give detailed numerical simulations that test the concept and investigate the effects of multi-access interference (MAI) and optical beat interference (OBI) on the slot decisions. These simulations provide guidelines for subsequent experimental measurements that will be described.

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Wavelength hopping/time spreading codedivision multiple access systems

Cited by 161 publications

References 3 publications

Design and Simulation of Two-Dimensional OCDMA En/Decoder Composed of Double Ring Add/Drop Filters and Delay Waveguides

Design and Simulation of Two-Dimensional OCDMA En/Decoder Composed of Double Ring Add/Drop Filters and Delay Waveguides

Simple robust receiver structure for gigabit ethernet O-CDMA using matrix codes

Design and evaluation of a virtual quadrant receiver for 4-ary pulse position modulation/optical code division multiple access (4-ary PPM/O-CDMA)

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