Power control of optical CDMA star networks

Tarhuni, Naser; Korhonen, Timo; Elmusrati, Mohammed; Mutafungwa, Edward

doi:10.1016/j.optcom.2005.09.068

Cited by 37 publications

(62 citation statements)

References 13 publications

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“…Finally, we generate 10 4 network realizations from which we calculate the CDF of the spectral radius for the Rate Reduction Algorithm of section IV (6). For the applied network parameters, the mean and variance of the network spectral radius are found to be 0.98 and .0036 respectively.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The spectral radius of H was evaluated to be equal to ρ (H) = σ 2 (K−1) [6], where we assume that the crosscorrelation variance is constant with the average value σ 2 = E{σ 2 ij }. Then, remembering (6) we can write,…”

Section: Rate Reduction Algorithmmentioning

confidence: 99%

“…Therefore, different user transmission is highly orthogonal and near far problem can be neglected. In [5] and [6], we applied a centralized algorithm to a temporal OCDMA network in order to set the optical sources to their optimum values. It was assumed that all users applied the same bulk data rate and SIR.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Class Optical-Cdma Network Using Optical Power Control

Tarhuni¹,

Elmusrati

Korhonen

2006

PIER

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Abstract-In this paper we use optical power control to support multirate transmission over temporal optical CDMA networks. We apply the centralized power control algorithm to set the transmit power of the users' optical sources in order to satisfy a given target QoS. In addition, optical amplifiers are included to enhance the overall system performance while the Amplified Spontaneous Emission (ASE) is considered as the main noise source. The objective function defined as the sum of the transmitted optical power from all nodes is minimized subject to a signal-to-interference (SIR) constraint. Moreover, the network feasibility, defined as the ability to evaluate a power vector that satisfy the target SIR, is discussed in terms of the spectral radius of the network interference matrix. Next, the spectral radius of the network interference matrix is investigated and modeled as a truncated Gaussian distribution. Last, a rate reduction algorithm, categorized in terms of the number of nodes involved in the process of rate reduction, is proposed to increase the network feasibility. As more nodes are added to the rate reduction campaign, the network feasibility is significantly enhanced. For typical network parameters we find by simulating 10 4 random network realizations that a threenode rate reduction results in 99% network feasibility. 280Tarhuni, Elmusrati, and Korhonenn

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Rate Reduction Algorithmmentioning

confidence: 99%

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Multi-Class Optical-Cdma Network Using Optical Power Control

Tarhuni¹,

Elmusrati

Korhonen

2006

PIER

Self Cite

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“…This block diagram depicts a generic set of components from transmitter, optical fiber spans with optical amplifiers, star coupler and receiver. Generally, the OCDMA networks use optical amplifiers only as preamplifier at the receiver side [11]; however, considering the extension reached with passive optical networks (PONs) [6], it is possible to consider more than one amplifier or span in our model. In the OCDMA transmitter, the incoming data stream is encoded with FEC-LDPC-based codes.…”

Section: Block Diagram Of Transmission Systemmentioning

confidence: 99%

“…In a common channel, the interference that may arise between different code users is known as multiple access interference (MAI) and can limit the number of code users utilizing the channel simultaneously [7]. Furthermore, the establishment of conditions for transmissions with a higher optical signal-tonoise-plus-interference ratio (SNIR) allows us to reduce the number of retransmissions by higher layers, thus increasing network throughput [11].…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency in optical CDMA networks with forward error correction

Durand

Abrão

2015

Photon Netw Commun

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In this work, we investigate the energy efficiency in optical code division multiplexing access (OCDMA) networks with forward error correction (FEC). We have modeled the energy efficiency considering the capacity of information transmitted and the network power consumption. The proposed network power consumption model considers the optical transmitter, receiver, optical amplifiers, FEC and network infrastructure as encoders, decoders, star coupler and network control in the overall optical power network consumption balance. Furthermore, an expression relating the signal-to-noise-plus-interference ratio gain for forward error correction with low-density parity-check code scheme considering the power consumption and bandwidth occupancy has been derived. Numerical results for OCDMA networks with aggregated FEC procedure have revealed the viability of the FEC deployment aiming to increase the overall energy efficiency of OCDMA networks.

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The effects of multiple access interference and polarization mode dispersion on the outage probability and blocking probability in optical code paths

Durand

Barbosa

Abbade

et al. 2012

Trans. Emerging Tel. Tech.

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In this work, we investigate through a formal approach the effects of multiple access interference and polarization mode dispersion on the blocking probability in optical code paths (OCP)s. These paths are determined by the data encoding with non‐coherent codes from code division multiplexing using prime code sequences. We modeled the blocking probability in the OCPs considering the outage probability like a threshold to determine the number of acceptable active OCPs in each wavelength. In this model, new OCPs are granted until the number of active OCPs on the wavelength reaches the blocking threshold; after that, requests are blocked. Results show quantitatively the contribution of multiple access interference effects and polarization mode dispersion constraints on the outage probability and their impact on the blocking probability in the OCPs. Copyright © 2012 John Wiley & Sons, Ltd.

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Power control of optical CDMA star networks

Cited by 37 publications

References 13 publications

Multi-Class Optical-Cdma Network Using Optical Power Control

Multi-Class Optical-Cdma Network Using Optical Power Control

Energy efficiency in optical CDMA networks with forward error correction

The effects of multiple access interference and polarization mode dispersion on the outage probability and blocking probability in optical code paths

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