Multi-rate and multi-BEP transmission scheme using adaptive overlapping pulse-position modulator and power controller in optical CDMA systems

Miyazawa, Tatsuo; Sasase, Iwao

doi:10.1109/jcn.2005.6387988

Cited by 4 publications

(8 citation statements)

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“…For each i-th OCP, the maximum number of transmitted bits occurs at power level for which the partial derivative of energy efficiency function in (14) with respect to p i is zero ∂ η i / ∂ p i = 0. Considering a SNIR general formula for CDMA networks, given by [6] , 1,..,…”

Section: Energy Efficiency Optimization In Ocpsmentioning

confidence: 99%

“…Distinct power levels were obtained with power attenuators [10], adjustable encoders/decoders [11], and adjustable transmitters [12]. Furthermore, the optimal selection of the system's parameters such as the transmitted power and the information rate would improve their performances [9,[13][14][15]. In [13], optical power control and time hopping for multimedia applications using single wavelength was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…However, in order to implement such system an optical selector device that consists of a number of optical hard-limiters is needed [13]. On the other hand, in [14] a multi rate and multi power level scheme using adaptive overlapping pulse-position modulator (OPPM) and optical power controller was proposed. The bit rate varies depending on the number of slots in the optical OPPM system and has the advantage that it is not required to change the code sequence depending on the required user's information rate.…”

Section: Introductionmentioning

confidence: 99%

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Optical Network Optimization Based on Particle Swarm Intelligence

Durand¹,

Melo²,

Garcia³

et al. 2013

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Additional information is available at the end of the chapter . IntroductionModern optical communication networks are expected to meet a broad range of services with different and variable demands of bit rate, connection session duration, frequency of use, and set up time [ ]. Thus, it is necessary to build flexible all-optical networks that allow dynamic resources sharing between different users and clients in an efficient way. The alloptical network is able to implement ultrahigh speed transmitting, routing and switching of data in the optical domain, presenting the transparency to data formats and protocols which increases network flexibility and functionality such that future network requirements can be met [ ]. Optical code division multiplexing access OCDM" based technology has attracted a lot of interests due to its various advantages including asynchronous operation, high network flexibility, protocol transparency, simplified network control and potentially enhanced security [ ]. Therefore, recent developments and researches on OCDM" have been experienced an expansion of interest, from short-range networks, such as access networks, to highcapacity medium/large networks.The optical network presents two promising scenarios the transport backbone networks with optical code division multiplexing/wavelength division multiplexing OCDM/WDM technology and the access network with OCDM" technology. In both, transport OCDM/WDM and access OCDM" networks, each different code defines a specific user or logic channel transmitted in a common channel. In a common channel, the interference that may arise between different user codes is known as multiple access interference M"I , and it can limit the number of users utilizing the channel simultaneously [ ]. In this work we © 2013 Durand et al.; licensee InTech. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.have focus on hybrid OCDM/WDM systems. In this one, data signals in routing network configuration are carried on optical code path OCP from a source node to a destination node passing through nodes where the signals are optically routed and switched without regeneration in the electrical domain. Hence, in routing and channel code/wavelength assignment RC" problem, suitable paths and channels are carefully selected among the many possible choices for the required connections [ ].Establishing OCP with higher optical signal-to-noise plus interference ratio SNIR allows reducing the number of retransmissions by higher layers, thus increasing network throughput. Therefore, RC" techniques that consider physical layer impairments for the establishment of an OCP, namely Quality of Transmission-"ware QoT-aware RC", could be much more practical [ -]. For a dynamic traffic scenario the objective is to minimize the blocking probability of the connections by rou...

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Section: Energy Efficiency Optimization In Ocpsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical Network Optimization Based on Particle Swarm Intelligence

Durand¹,

Melo²,

Garcia³

et al. 2013

Search Algorithms for Engineering Optimization

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“…On the other hand, variable-weight optical codes (with identical-chip-power) and multilevel (different-chip-power) signaling have been introduced to provide QoS differentiation in OCDMA networks by controlling the BER at the receiver [15]- [22]. In [23], multirate transmission is achieved using adaptive OPPM in OCDMA networks by accommodating users with different number of symbols M . In addition, optical power controller is employed to provide variable QoS levels for different traffic types.…”

mentioning

confidence: 99%

Performance Analysis of Multirate Multiservice Optical CDMA Networks Adopting Overlapping PPM Signaling

Farghal

Shalaby

Kawasaki

2014

J. Lightwave Technol.

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In this paper, an optical code-division multiple-access (OCDMA) system employing overlapping pulse-position modulation (OPPM) is proposed to support multimedia services with different bit-rate and quality-of-service (QoS) requirements in OCDMA networks. Both wrapped OPPM (WOPPM) and unwrapped OPPM (UOPPM) are considered. The proposed system achieves multirate and multi-QoS transmission by using multilength variable-weight optical orthogonal codes (MLVW-OOCs) as signature sequences and using different values of OPPM modulation parameters. Furthermore, numerical analysis is performed for two different receiver structures, namely, correlation receivers with and without hard-limiters. In our analysis, the multiple-access interference (MAI) is considered as the main performance limiting factor. In addition, the performance of the proposed system is evaluated and compared to that of traditional OOK-OCDMA system. Our results reveal that under both pulsewidth and throughput constraints, the performances of the proposed WOPPM-and UOPPM-OCDMA systems are significantly superior to that of OOK-OCDMA system. Index Terms-Bit-error-rate (BER), code division multiple access (CDMA), multiple-access interference (MAI), ON-OFF keying (OOK), overlapping pulse-position modulation (OPPM), quality of service (QoS). I. INTRODUCTIONO PTICAL code-division multiple-access (OCDMA) has gained much attention as one of the promising multipleaccess technique for future optical-access networks [1]-[4]. This is mainly due to the attractive OCDMA features, such as full asynchronous entire optical channel sharing among multiple users without any waiting time, which results in low latency access and less transmission delay. In addition to simplified and distributed network control, secure data transmission, soft capacity on demand, bursty traffic, and the ability to support multimedia services differentiation at the physical layer [5], [6].Both on-off keying (OOK) and pulse-position modulation (PPM) have been commonly used as modulation techniques in Manuscript

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“…This limited the system applicability because of the limited number of available codes. In [60], a multirate, multi-QoS OCDMA system using M-ary overlapping pulse-position modulation (OPPM) and power controller has been proposed. In this system, the power controller is employed to support multi-QoS while the multiplicity factor is varied in order to support multirate transmission.…”

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confidence: 99%

Proposal of a new approach for BER evaluation of multirate, multiservice OCDMA systems

Raddo¹

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The continuous evolution of the optical communication technology in the last few years has allowed the growing users' demand for higher bandwidth to be satisfactorily attended. This new demand is mainly attributed to the growing popularity of bandwidthintensive networking applications, such as Internet protocol television (IPTV), highdefinition television (HDTV), e-learning, e-health, super high-definition (SHD) class digital movies, and e-culture based on 3-D full-HD video. These applications will eventually require differentiated service types and diversified data rates. As a result, capability of supporting differentiated-quality of service (QoS) and multirate transmission are becoming a challenge for future optical networks. Among many multiplexing techniques, optical code-division multiple-access (OCDMA) constitutes a potential candidate for next generation optical networks, particularly due to features like asynchronous operation, simplified network control, easy addition of new users, and possibility of differentiated-QoS at the physical layer. The performance of this access technique is mainly limited by multiple-access interference (MAI). Although in multirate, multiservice OCDMA systems MAI is considered to be binomially distributed, others probability distributions for the MAI analyzes and consequently the bit error rate (BER) have been used as an approximation. In this context, this dissertation proposes a new formalism to evaluate the BER performance of 1-D and 2-D multirate, multiservice OCDMA systems considering MAI as binomially distributed, resulting in a more accurate BER expression. Also, the proposed approach does not require knowledge a priori of the generated code sequences themselves, which means that the system performance analysis is achieved more easily using only the code parameters. Furthermore, a multirate OCDMA system employing 1-D optical orthogonal code (OOC) and 2-D optical fast frequency hopping (OFFH) codes is also investigated. A performance comparison in terms of BER for the OOC-based system assuming both Poisson and binomial distribution for the MAI is investigated. A further comparison of an OFFH-IV based multirate system assuming both gaussian and binomial distribution for the MAI is also analyzed. It is shown that BER performance in multirate scenarios can be overestimated or underestimated by many orders of magnitude depending on the assumed distribution for the MAI and on the number of simultaneous users. Moreover, it is presented for the first time a hybrid OCDM/WDM optical packet switch capable of supporting multirate and differentiated-QoS transmission. The architecture of the proposed multirate switch and its performance in terms of packet loss probability are also presented. Finally, it is shown that using a gaussian or Poisson distribution for the MAI might not be appropriate for a reliable BER estimate, since they are not acceptable approximations to assess the performance of multirate, multiservice systems with good accuracy.

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Multi-rate and multi-BEP transmission scheme using adaptive overlapping pulse-position modulator and power controller in optical CDMA systems

Cited by 4 publications

References 26 publications

Optical Network Optimization Based on Particle Swarm Intelligence

Optical Network Optimization Based on Particle Swarm Intelligence

Performance Analysis of Multirate Multiservice Optical CDMA Networks Adopting Overlapping PPM Signaling

Proposal of a new approach for BER evaluation of multirate, multiservice OCDMA systems

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