Tunable prime-code encoder/decoder for all-optical CDMA applications

Zhang, J.-G.; Picchi, G.

doi:10.1049/el:19930809

Cited by 55 publications

(42 citation statements)

References 5 publications

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“…Figure 1 shows the structure of the proposed optical encoder. The proposed tunable OCDMA encoder/decoder structure is based on the 2 × 2 optical switches act as tunable optical filters provides incoherent configuration [11,12]. For the transmission of data bit one, the modulated optical pulses are launched at the input of the encoder where they are demultiplexed into P pulses by the wavelength division de-multiplexer.…”

Section: D Ocdma Encoder/decoder Structurementioning

confidence: 99%

Two Dimensional Tunable Optical-CDMA System

Yadav

Kaur

2016

IJEECS

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In this work an experimental demonstration is proposed to implement the synchronous optical code division multiple access system using two dimensional wavelength hopping and time spreading optical prime code is presented. An optical CDMA system is configured on latest version of optisystem by optiwave for the 20 users (Prime Number = 5) IntroductionIn recent time, Optical Code Division Multiple Access (O-CDMA) is an emerging technology for providing a reliable and scalable communication system. OCMDA support multiple user access over large bandwidth provided by the optical fiber. OCDMA is a suitable multiple access technique for access network and LAN because of its flexibility and scalability to the network topology [1,2]. Optical CDMA has been studied by lot of researchers in past for many years because of fast and secure data transmission feature inherently lies in the optical fiber while efficient traffic management and zero access delay is offered by CDMA technique [3]. With the advancement in optical fiber and optical components the transmission over the fiber has also get improved considerably.The performance of Optical CDMA system significantly depends upon the optical code and system configuration [4]. As in communication system, each subscriber communicates with others at same or different time. Thus each user is typically assigned a unique code and has a tunable encoder and decoder. The encoder and decoder must be tuned to that particular code in order to transmit the information successfully even though in the presence of other user in the system [5]. Researchers have proposed many coding techniques like 1D spectral phase encoding, 1D spectral amplitude coding, 1D time spread coding, 2D wavelength hopping and time spreading coding [6] etc.The presented 2D tunable Optical CDMA system is computer program controlled, wellconfigured, reliable and cost effective. This is because of the superior designing using multimode fiber as well as the ability of controlling many users concurrently and since non interfering codes has been used. The features and feasibility of system are characterized in the paper as: the two dimensional prime code /prime code codeword is discussed in section 2. The structure of two dimensional encoder and decoder are explained in section 3. The experimental setup and results are presented in section 4. The performance of the 2D optical CDMA system has been compared with the 1D optical CDMA system for comparative analysis.The evaluation of result has been discussed in section 5. Conclusion has been summarized in section 6.

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Section: D Ocdma Encoder/decoder Structurementioning

confidence: 99%

Two Dimensional Tunable Optical-CDMA System

Yadav

Kaur

2016

IJEECS

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“…If the rate of the nodes with the highest indicators are reduced, then the upper bound in (11) decreases. Consequently, the mean and variance of the truncated Gaussian spectral radius will be decreased leading to increased probability of feasibility according to (9). Hence, the k−RR algorithm is summarized as follows.…”

Section: Rate Reduction Algorithmmentioning

confidence: 99%

“…Therefore, codes such as prime codes and optical orthogonal codes are specifically designed for incoherent optical CDMA applications. In order to be able to support varying code lengths and weights tunable optical encoders with adaptive optical CDMA encoding capability can be found in [8,9]. After traversing the transmit-node fiber, star coupler and the receive-node fiber, the optical signal from all nodes is decorrelated optically by a matched decoder.…”

Section: System Modelmentioning

confidence: 99%

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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“…The optical direct sequence spread spectrum (DS-SS) system can be expected to enable high-speed communication using a wide band [1][2][3]. Multiple access interference (MAI) cancellation methods with the optical orthogonal code (OOC) or modified prime sequence code (MPSC) have been proposed in the optical code division multiple access (CDMA) system [4,5].…”

Section: Introductionmentioning

confidence: 99%

Code Generator for Optical ZCZ Sequence with Zero-Correlation Zone 2<sup>z</sup>

Ohira

Matsumoto

Torii

et al. 2017

Journal of Signal Processing

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Generation methods of the optical zero-correlation zone (ZCZ) sequence set with ZCZ 1, 4z − 2 and 2 z have been proposed, where z is a natural number. However, the code generator for the sequence with ZCZ 2 z has not been considered. In this paper, we propose a new construction of a code generator without ROM. The proposed code generator can suppress the circuit size and operate faster than the conventional code generator with ROM. In addition, the conventional and proposed code generators for the sequences with the ZCZ sizes of 2, 4, and 8 are implemented on a field-programmable gate array (FPGA) and compared. As a result, the proposed code generator can reduce the circuit size and operate faster than the conventional code generator.

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Tunable prime-code encoder/decoder for all-optical CDMA applications

Cited by 55 publications

References 5 publications

Two Dimensional Tunable Optical-CDMA System

Two Dimensional Tunable Optical-CDMA System

Multi-Class Optical-Cdma Network Using Optical Power Control

Code Generator for Optical ZCZ Sequence with Zero-Correlation Zone 2<sup>z</sup>

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