DS-OCDMA receivers based on parallel interference cancellation and hard limiters

Goursaud, Claire; Julien-Vergonjanne, Anne; Aupetit-Berthelemot, Christelle; Cances, Jean-Pierre; Dumas, Jean-Michel

doi:10.1109/tcomm.2006.881252

Cited by 20 publications

(13 citation statements)

References 22 publications

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“…3 are given as the function of user number, for the OOC (F=534, W=3), a CCR and error correction performed with three different LDPC parameters (N, K): (N=2715, K=2535), (2172,1992), and (905, 725) of rates respectively equal to R=0.93, R=0.92 and R=0. 8. In order to appreciate the performance of error correction, we have also made simulations with the Reed Solomon codes RS (255, 239) having a code rate similar to the LDPC (2715, 2535) one (i.e.…”

Section: Performance Analysismentioning

confidence: 99%

“…Another way to mitigate MAI is to improve receiver schemes [1], [5][6][7][8]. The simplest techniques are based on the use of hard limiter devices at the reception end [1], [5] which permits removing some interference patterns.…”

Section: Introductionmentioning

confidence: 99%

“…The simplest techniques are based on the use of hard limiter devices at the reception end [1], [5] which permits removing some interference patterns. The most efficient techniques to significantly reduce interference impact consist in using multi-user receivers [6][7][8]. However, their implementation requires a high complexity, increasing with the number of users and thus is more complicated for practical networks.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Optical CDMA Systems with Low Density Parity Check Codes

Sahuguède

Julien-Vergonjanne

Cances

2007

2007 Second International Conference on Systems and Networks Communications (ICSNC 2007)

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Incoherent Optical Code Division Multiple Access (OCDMA) is a potential issue for future high speed optical networks. To reduce the number of errors at the detection due in particular to Multiple Access Interference (MAI), we add to the OCDMA link a block of efficient error correction codes named Low Density Parity Check codes (LDPC). The LDPC decoding algorithm, Belief Propagation (BP), usually employed to correct errors due to Gaussian noise, is reconsidered in order to take into account the MAI binomial distribution. The performance of an OCDMA link using 1 Dimensional and 2 Dimensional code sequences along with several LDPC codes is investigated. The performance is enhanced not only in an ideal case with only MAI, but also in a noisy case with MAI and thermal noise. With such error correction coding scheme, the constraints over OCDMA parameters and the signal to noise ratio are greatly relaxed.

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Section: Performance Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of Optical CDMA Systems with Low Density Parity Check Codes

Sahuguède

Julien-Vergonjanne

Cances

2007

2007 Second International Conference on Systems and Networks Communications (ICSNC 2007)

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“…They are implemented at the cost of stress relief on the correlation properties of sequences used. The codes are used in optical CDMA optical orthogonal codes (OOC) and the prime code (PC) [2,6].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Optical Unipolar Codes for Incoherent DS-OCDMA system

Chikh-Bled¹,

Boudaoud²,

Chetouane³

2013

IJHIT

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“…MAI is introduced in CDMA systems due to the inability to maintain complete orthogonally of users' signature sequences over the hostile communication channels. [1]- [5] Due to these advantages, (CDMA) has been the focus of much research in the last twenty years, primarily in the radio frequency domain, and also in the optical domain, where the traditional method to recover the data at the receiving end of an optical CDMA system is to use an optical correlator followed by a photodetector and a decision device [1].…”

Section: Introductionmentioning

confidence: 99%

A Novel Successive Interference Cancellation Scheme in OCDMA System

Eltaif

Shalaby

Shaari

2006

2006 IEEE International Conference on Semiconductor Electronics

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In DC/CDMA systems, overcoming near/far effects is imperative for satisfactory performance. One way to combat the near/far effect is to use stringent power control. Another approach is multiuser detection (MUD). In addition to mitigating the near/far effect, MUD has more fundamental potential of raising capacity by canceling MAI. In this paper we going to present MUD scheme's known as successive interference cancellation (SIC). Where DS-OCDMA receiver was studied based on the SIC technique without hard limiter. Also we mention to use this technique with hardlimiter placed before the nondesired users.

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DS-OCDMA receivers based on parallel interference cancellation and hard limiters

Cited by 20 publications

References 22 publications

Performance of Optical CDMA Systems with Low Density Parity Check Codes

Performance of Optical CDMA Systems with Low Density Parity Check Codes

Comparative Study of Optical Unipolar Codes for Incoherent DS-OCDMA system

A Novel Successive Interference Cancellation Scheme in OCDMA System

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