The performance of optical fiber direct-sequence spread-spectrum multiple-access communications systems

Letaief, Khaled B.

doi:10.1109/26.481215

Cited by 30 publications

(13 citation statements)

References 12 publications

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“…R ECENTLY, direct-sequence code-division multiple access (DS/CDMA) has become very popular in various applications such as optical and wireless communications [1], [2]. However, it is well known that the conventional CDMA receiver does suffer from serious problems.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, it is a maximum-likelihood detector which consists of a bank of conventional single-user matched filters followed by a Viterbi algorithm whose complexity grows exponentially as the number of users increases. 1 Further, it has been shown that the multiuser optimum decision problem is NP-hard. To reduce the complexity of this optimum detector various suboptimum multiuser detectors have been developed in the past several years [4]- [7].…”

Section: Introductionmentioning

confidence: 99%

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Successive interference cancellation for multiuser asynchronous DS/CDMA detectors in multipath fading links

Hui

Letaief

1998

IEEE Trans. Commun.

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190

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Abstract-In recent years, there has been an increasing interest in the use of code-division multiple access (CDMA) in cellular mobile and wireless personal communications. The choice of such multiaccess technique is attractive because of its potential capacity increases and other technical factors such as privacy and multipath rejection capabilities. However, it is well known that the performance of CDMA can be significantly degraded due to cochannel interference (CI) and the near-far effects. In this paper we consider the performance of direct-sequence (DS)-based CDMA over fading channels that are modeled as slowly varying Rayleigh-fading discrete multipath channels. Specifically, we propose and analyze an adaptive multistage interference cancellation strategy for the demodulation of asynchronous DS spread-spectrum multiple-access signals. Numerical results will show that the proposed multistage detector, which alleviates the detrimental effects of the near-far problem, can significantly improve the system performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Successive interference cancellation for multiuser asynchronous DS/CDMA detectors in multipath fading links

Hui

Letaief

1998

IEEE Trans. Commun.

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190

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“…In [21] Ben Letaief has presented the IS technique for analyzing direct detection OCDMA systems with Optical Orthogonal Codes (OOC) and PS codes. The accuracy and computational efficiency of the proposed method have been investigated.…”

Section: Principe Of Importance Sampling Techniquementioning

confidence: 99%

Simulative Investigation on Spectral Efficiency of Unipolar Codes based OCDMA System using Importance Sampling Technique

2013

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This paper analyses the spectral efficiency of Optical Code Division Multiple Access (OCDMA) system using Importance Sampling (IS) technique. We consider three configurations of OCDMA system namely Direct Sequence (DS), Spectral Amplitude Coding (SAC) and Fast Frequency Hopping (FFH) that exploits the Fiber Bragg Gratings (FBG) based encoder/decoder. We evaluate the spectral efficiency of the considered system by taking into consideration the effect of different families of unipolar codes for both coherent and incoherent sources. The re sults show that the spectral efficiency of OCDMA system with coherent source is higher than the incoherent case. We demonstrate also that DSOCDMA outperforms both others in terms of spectral efficiency in all conditions.

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“…It is shown in this work that the implementation of the spread spectrum technique [9][10][11], along with a Rake receiver at the output of the fiber, compensates effectively for the negative effects of multipath propagation of optical signals that characterizes multimode fibers.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Transmission Properties of Multimode Fibers Using Spread Spectrum Technique and a Rake Receiver Approach

Kamitsos¹,

Uzunoglu²

2007

PIER

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Abstract-Multimode fibers are characterized by multipath propagation of optical signals and this leads to severe intersymbol interference at the output of the fiber. In this work an approach based on the Rake receiver is proposed to overcome this drawback. An optimization algorithm was developed and appropriate software was employed to apply the proposed methodology on specific multimode fiber. Extensive simulation results were produced and are presented herein. The numerical results have shown that the order of magnitude of the maximum data rate, R, supported at different CDMA gains, in order to achieve a Bit Error Rate value smaller or equal to a convergent point, is related to the length of the multimode fiber, L, by the expression R = dL −1 with d increasing from 10 6 to 10 7 (Kbps. m) when CDMA gain increases from 50 to 500.

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The performance of optical fiber direct-sequence spread-spectrum multiple-access communications systems

Cited by 30 publications

References 12 publications

Successive interference cancellation for multiuser asynchronous DS/CDMA detectors in multipath fading links

Successive interference cancellation for multiuser asynchronous DS/CDMA detectors in multipath fading links

Simulative Investigation on Spectral Efficiency of Unipolar Codes based OCDMA System using Importance Sampling Technique

Improvement of Transmission Properties of Multimode Fibers Using Spread Spectrum Technique and a Rake Receiver Approach

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