Analysis of High-Speed Optical Wavelength/Time CDMA Networks Using Pulse-Position Modulation and Forward Error Correction Techniques

Raddo²,

Sanches³

et al. 2015

J. Opt. Commun. Netw.

This paper introduces a new application of fuzzy logic control (FLC) for the improvement of traffic performance over optical code-division multiple-access (OCDMA) networks. This application focuses on the mitigation of environmental temperature variation effects that occur in the transmission links that impact the expected magnitude of the autocorrelation peak in the users' code. The FLC system, whose input variables are the propagation distances and the estimated temperature changes, is installed in the network receivers. This system sets the threshold detection level according to the variations of the environmental temperature provided by external sensors. Calibration of the fuzzy control requires a priori knowledge of the analytical response of the OCDMA channels. The simulation results show that the network performance can be significantly improved when the proposed approach is employed.

Section: Fuzzy Logic Control At the Receiver Of An Ocdma Networkmentioning

confidence: 99%

“…The output value ThFLC that is sent I FUZZY CONTROL RULES VLT LT MT HT VHT ELD Th8 Th8 Th8 Th8 Th8 LD Th8 Th8 Th8 Th8 Th8 MD Th8 Th8 Th8 Th7 Th6 HD Th8 Th8 Th7 Th6 Th3 VHD Th8 Th8 Th6 Th3 Th1 Fig. 6. Fuzzy inference sets of rule base.…”

Section: Fuzzy Logic Control At the Receiver Of An Ocdma Networkmentioning

confidence: 99%

Fuzzy Logic Control for the Mitigation of Environmental Temperature Variations in OCDMA Networks

Raddo²,

Sanches³

et al. 2015

J. Opt. Commun. Netw.

“…Next, we obtain a BER expression assuming that MAI has a binomial distribution, given that the output interference of any OCDMA system is considered to be binomially distributed [5], [8], [9].The MAI is assumed to be the main degrading factor of the system, as it is the most important noise source [1]. In addition, we assume a chip synchronous scenario, which reflects the worst possible case for the system analyses [8], [10], and consider that users transmit data bits "0" and "1" with equal probability ½ [10].…”

Section: Description and Performance Analysis Of Multiservice Ip Tranmentioning

confidence: 99%

“…In addition, we assume a chip synchronous scenario, which reflects the worst possible case for the system analyses [8], [10], and consider that users transmit data bits "0" and "1" with equal probability ½ [10]. Accordingly, we have derived new BER and PER expressions of class users based on the formalism proposed in [1].…”

Section: Description and Performance Analysis Of Multiservice Ip Tranmentioning

confidence: 99%

Multiservice, multirate IP transmission over OCDMA network

Raddo

Sanches

2013 15th International Conference on Transparent Optical Networks (ICTON)

et al. 2013

In this paper, we propose a new Internet protocol (IP) traffic transmission architecture over optical code-division multiple-access (OCDMA) network capable of providing multiservice, multirate transmissions. The new architecture is independent of the OCDMA scheme employed. The main idea is to use multi-weight multi-length optical orthogonal code (MWML-OOC) as signature sequence of an incoherent OCDMA system to achieve multiservice and multirate transmissions. Furthermore, in order to evaluate the packet error rate (PER) of the proposed multiservice IP transmission, we derive a bit error rate (BER) expression of a MWML-OOC OCDMA system. The network performance is analyzed in terms of the channel utilization of the users' classes. The simulation results show that better performance is obtained by users defined with high-weight code. This is especially evident when the channel utilization is low. Keywords: multiservice, multirate IP Transmission, OCDMA, BER. INTRODUCTIONThe recent advent of new Internet protocol (IP) based multimedia applications such as IPTV, e-learning, e-culture based on 3-D full-HD (high-definition), e-health, and so on, in ubiquitous Internet-based communication networks will eventually demand for differentiated service types and diversified data rates. These aspects most certainly will become an essential challenge for future optical networks [1]. IP has been the dominant protocol to deliver the recent multimedia applications services [2] and will continue to grow at an exponential rate as the demand for multimedia services across the Internet continues to expand. Nonetheless, IP routing operates electrically in the network layer and cannot be processed at a speed that matches the huge transmission capacity provided by optical fiber [2]. A potential solution to this challenging shortcoming has been proposed in [3], where we investigated a multirate, multiclass optical packet switch (OPS). In this approach, the bandwidth on a wavelength is divided into small fractions labelled with codes and assigned to different channels. However, like any emerging technology, there are still a few drawbacks to be addressed in OPS, such as contention resolution, to emerge it as a successful technology. Currently, optical code-division multiple-access (OCDMA) has become an attractive technology in all-optical networking, particularly due to features like easy addition of new users, possibility of differentiated-QoS at the physical layer, and support to bursty and asynchronous networks traffic, i.e., IP traffic nature [1], [2], [4]. In addition, OCDMA provides more immunity to packet collisions than dynamic bandwidth allocation in time-division multiple-access schemes [5]. Moreover, OCDMA has a teletraffic capacity larger than wavelength-division multiple-access, especially when bursty traffic is carried out [6].In this paper, we propose and introduce a new multiservice, multirate IP traffic network architecture over OCDMA. The proposed architecture is independent of the OCDMA scheme or spreading code e...

“…A potential candidate to perform access control in PON is the Optical Code-Division Multiple-Access (OCDMA) technique, due to relevant characteristics, such as improved security, asynchronous transmission and flexible capacity on demand [2], [3]. However, external physical agents, such as variations in environmental temperature, have considerable influence on the operating conditions of the optical network [4].…”

Section: Introductionmentioning

confidence: 99%

Comparison between Mamdani and Sugeno fuzzy inference systems for the mitigation of environmental temperature variations in OCDMA-PONs

2015 17th International Conference on Transparent Optical Networks (ICTON)

Raddo

Sanches

et al. 2015

This paper presents a comparative study between the Mamdani and Sugeno fuzzy inference systems (FIS) for intelligent traffic transmission over optical code-division multiple-access (OCDMA) network architectures. This FIS is capable of mitigating environmental temperature variation effects in the transmission link which are known to play an important role in the overall performance of the network. The paper outlines the basic difference between both Mamdani and Sugeno type FIS for this approach. The results highlight the performance of the two systems and the computational advantages of using Sugeno-type over Mamdani-type.