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Taking into account quality of transmission (QoT) constraints, wavelength continuity constraint and wavelength integrity constraint when solving the Routing and Wavelength Assignment (RWA) problem in Wavelength-Division Multiplexing (WDM) transparent networks leads to inefficient utilization of network resources and results in higher rejection ratio. This is especially severe when dynamic traffic...
Physical layer impairments, in Wavelength-Division Multiplexing (WDM) transparent networks, deteriorate the analog signal quality when it progresses from its source node to its destination node. Thus, the lightpaths' Quality of Transmission (QoT) might become potentially unacceptable. Such degradation has a severe impact on the performance of long-haul transmission transparent optical networks in...
Physical layer impairments, in Wavelength-Division Multiplexing (WDM) transparent networks, deteriorate the analog signal quality when it progresses from its source node to its destination node. Thus, the lightpaths' Quality of Transmission (QoT) might become potentially unacceptable. Such degradation has a severe impact on the performance of long-haul transmission transparent optical networks in...
In WDM all-optical networks, the wavelength continuity constraint along with the wavelength clash constraint, lead to poorer network performances when dealing with the lightpath provisioning problem. The impact of these constraints is especially severe when traffic demands are unpredictable and characterized by random arrivals and departures. To improve the network utilization efficiency, either wavelength...
One limitation of a WDM all-optical network is the wavelength continuity constraint imposed by the all-optical cross-connect switches which do not allow a circuit to be placed on a non wavelength-continuous route. This constraint leads to inefficient utilization of wavelength channels and results in higher blocking probability. Rerouting is an effective approach that can increase the efficiency. In...
In this paper, we propose a novel lightpath rerouting algorithm to optimize network resources allocation in WDM all-optical networks in order to set up an incoming lightpath demand to be blocked for lack of resources or due to the absence of a suitable path and a suitable wavelength that meet the minimum Quality of Transmission (QoT) requirements. Indeed, in such networks, transmitted optical signal...
This paper considers rerouting and minimization of incurred disruption due to rerouting in all-optical wavelength division multiplexed (WDM) network with dynamic (random) traffic arrivals and departures. One limitation of such a network is the wavelength continuity constraint imposed by the all-optical cross-connect switches which do not allow a circuit to be placed on a non wavelength-continuous...
The Orthogonal spacetime block code proposed by Alamouti [1], which is a promising scheme for information transmission over Rayleigh-fading channels using two transmit antennas due to its favorable characteristics of having full transmit diversity, full rate and a simple maximum-likelihood (ML) decoding algorithm, motivates searches for similar schemes using more than two transmit antennas. Many authors...
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