Chip-level detection in optical code division multiple access

Shalaby, Hossam M. H.

doi:10.1109/50.681466

Cited by 136 publications

(87 citation statements)

References 16 publications

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“…It has been shown that if only Poisson Shot-Noise is considered, the performance of this receiver rapidly approaches the performance of ideal hard-limiter receiver [6].…”

Section: G High-speed Chip-level Detectormentioning

confidence: 99%

“…In this paper, we present a unified model for performance analysis of different proposed receiver structures taking into account all major noise sources, i.e., quantum shot-noise, photodetector dark current noise, and circuit Gaussian noise. The analysis performed here simplifies for special cases to the analysis performed in preceding analyses, especially those in [6] and [7]. We will discuss the major strengths and drawbacks of each structure.…”

Section: Introductionmentioning

confidence: 99%

“…Ohtsuki [7] has proposed the use of double optical hard-limiter to realize the optical AND gate structure [8] and has shown that the system performs well in the presence of Photodetector Poisson Shot-Noise. Shalaby [6], on the other hand, has introduced the concept of chip-level detection in optical CDMA networks. His analysis also considers the Poisson Shot-Noise.…”

Section: Introductionmentioning

confidence: 99%

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Analytical comparison of various fiber-optic CDMA receiver structures

Zahedi

Salehi²

2000

J. Lightwave Technol.

108

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Abstract-In this paper, we study the performance of optical code-division multiple access (CDMA) systems using various receivers structures. Two general classes of receivers based on required electronic bandwidth are studied. Optical orthogonal codes (OOCs) are utilized as signature sequences and the performance studied in this paper takes into account the effect of all major noise sources, i.e., quantum shot-noise, dark current noise, and Gaussian circuit noise. Furthermore, this paper introduces a generalized method of analyzing the performance of various optical CDMA receiver structures. Required mean number of photon count per chip time for reliable transmission of data bits for various receiver structures is investigated. Finally, the advantages and disadvantages of various receiver structures are discussed.Index Terms-Channel interference, optical code division multiple access (CDMA), optical encoder and decoder, optical hardlimiter, Poisson distribution.

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“…It has been shown that if only Poisson Shot-Noise is considered, the performance of this receiver rapidly approaches the performance of ideal hard-limiter receiver [6].…”

Section: G High-speed Chip-level Detectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analytical comparison of various fiber-optic CDMA receiver structures

Zahedi

Salehi²

2000

J. Lightwave Technol.

108

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“…At the receiver, a chip-level avalanche photodiode (APD) [11] implements photoelectric conversion. The received signal branches off into two routes for two-stage demodulation.…”

Section: Transmitter and Receivermentioning

confidence: 99%

Improved Code-Shift Keying Systems with Functional Pseudonoise Code in Optical-Wireless Channel

Takayanagi

Habuchi

Takamaru

et al. 2016

Journal of Signal Processing

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In this paper, improved code-shift keying (CSK) systems with a functional pseudonoise (PN) code are considered for use in indoor optical-wireless channels. In CSK, increasing the number of optical PN codes improves the data rate. It is also effective for increasing the number of simultaneously transmitting optical PN codes. This method is named N-parallel CSK (N-CSK), which indicates the transmission of N codes. In order to enhance the data rate of CSK systems, optical PN code design has become one of the key areas of study. As such functional codes, in this paper we consider EPOM and POEPC, which can be generated by fusing two kinds of optical PN codes. CSK systems can implement two-stage demodulation, which demodulates every optical PN code. It is expected that two-stage demodulation will improve the bit error rate (BER) performance of CSK systems. In this paper, we combine two-stage demodulation with CSK systems: CSK using EPOM and N-CSK using POEPC. It was found that the BER of CSK systems can be improved by utilizing two-stage demodulation.

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“…hundreds of users; enhanced bandwidth of 100 + Gbps; and higher scalability at long distances such as tens or hundreds of kilometres for LANs and metropolitan area networks (MAN). Significant progress of OCDMA research has been achieved worldwide in recent years, including several different OCDMA schemes that have been proposed based on different choices of sources [54,66,70,82], coding schemes [37,59,67] and detections [76,80,[83][84][85][86][87] which will be discussed in detail in this book through the following chapters.…”

Section: Motivations For Optical Cdma Communicationsmentioning

confidence: 99%

Introduction to Optical Communications

Ghafouri‐Shiraz

Karbassian

2012

Optical CDMA Networks

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The invention of the solid state ruby laser (acronym for light amplification by stimulated emission of radiation) in May 1960 [1] and the He-Ne gas laser [2] in December 1960 has led to some wide-ranging and very significant scientific and technological progress. This so-called 'discovery of the century', followed by the first use of semiconductor lasers [3][4][5] in communications, heralded the start of optical communications. The laser provided a powerful coherent light source together with the possibility of modulation at high frequency, and this opened up a new portion of the electromagnetic spectrum with frequencies many times higher than those commonly available in radio communication systems. In addition the narrow beam divergence of the laser made enhanced free-space optical transmission a practical possibility.Since optical frequencies are of the order of 100 THz, and information capacity increases directly with frequency bandwidth, the laser potentially offers a few order of magnitude increase in available bandwidth compared with microwave systems. Thus, by using only a small portion of the available frequency spectrum, a single laser could, in principle, carry millions of telephone conversations or TV channels.With the potential of such wideband transmission capabilities in mind, a number of experiments [6] using atmospheric optical channels were carried out in the early 1960s. These experiments showed the feasibility of modulating a coherent optical carrier wave at very high frequencies. However, the high cost of development for all the necessary components, and the limitations imposed on the atmospheric channel by rain, fog, snow and dust make such high-speed systems economically unattractive. However, numerous developments of free-space optical channel systems operating at baseband frequencies were in progress for earth-to-space communications [7,8].It soon became apparent that some form of optical waveguide was required. By 1963, bundles of several hundred glass fibres were already being used for small-scale Optical CDMA Networks: Principles, Analysis and Applications, First Edition. Hooshang Ghafouri-Shiraz and M. Massoud Karbassian.

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Chip-level detection in optical code division multiple access

Cited by 136 publications

References 16 publications

Analytical comparison of various fiber-optic CDMA receiver structures

Analytical comparison of various fiber-optic CDMA receiver structures

Improved Code-Shift Keying Systems with Functional Pseudonoise Code in Optical-Wireless Channel

Introduction to Optical Communications

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