Journal ArticleDOI
A performance analysis of optical overlapping PPM-CDMA communication systems
Reads0
Chats0
TLDR
In this article, a direct-detection optical code-division multiple-access (CDMA) system employing overlapping pulse-position modulation (OPPM) schemes is proposed and the upper and lower hounds on the bit error rate (BER) are derived taking into account the effect of both multiple-user interference and receiver shot noise.Abstract:
Direct-detection optical code-division multiple-access (CDMA) systems employing overlapping pulse-position modulation (OPPM) schemes are proposed. Both upper and lower hounds on the bit error rate (BER) are derived taking into account the effect of both multiple-user interference and receiver shot noise. The photodiodes' dark currents are neglected since their effect is minor. The throughput limitation of this system is evaluated as well. Performance characteristics are then compared to optical CDMA systems employing traditional ON-OFF keying (OOK) and pulse-position modulation (PPM) schemes. It is shown that under fixed data rate and chip time, OPPM-CDMA system superperforms both traditional systems. Moreover, it is shown that the throughput limitation of OPPM-CDMA is almost 6.7 times greater than that of OOK-CDMA.read more
Citations
More filters
Journal ArticleDOI
Emerging OCDMA communication systems and data networks (Invited)
TL;DR: An in-depth review of the trends and the directions taken by researchers worldwide in optical code-division multiple-access (OCDMA) systems and those trends and features that are essential to the successful introduction of various OCDMA techniques in communication systems and data networks in the near future are highlighted.
Journal ArticleDOI
Shifted carrier-hopping prime codes for multicode keying in wavelength-time O-CDMA
TL;DR: This paper studies the use of shifted carrier-hopping prime codes (CHPC) for multicode keying in wavelength-time optical code-division multiple-access (O-CDMA) systems and shows that there is a tradeoff between the error probability and the choice of M.
Journal ArticleDOI
Fresh Prime Codes Evaluation for Synchronous PPM and OPPM Signaling for Optical CDMA Networks
TL;DR: In this paper, the authors proposed a novel prime spreading sequence family referred to as ldquodouble-padded modified prime code (DPMPC)rdquo for direct-detection synchronous optical code-division multiple access (OCDMA) networks.
Journal ArticleDOI
Novel family of prime codes for synchronous optical CDMA
TL;DR: A novel prime spreading sequence family hereby referred to as “new-Modified Prime Code (n-MPC)” for direct-detection synchronous optical code-division multiple-access (OCDMA) networks and a new interference cancellation technique which significantly improves the bit error probability (BEP) of OPPM- OCDMA systems is introduced.
Journal ArticleDOI
Dicode pulse-position modulation: a novel coding scheme for optical-fibre communications
TL;DR: It is shown that dicode PPM gives a receiver sensitivity greater than digital PPM while operating at only four times the original data rate, which is significantly better than typical PCM sensitivities.
References
More filters
Journal ArticleDOI
Code division multiple-access techniques in optical fiber networks. I. Fundamental principles
TL;DR: An examination is made of fiber-optic code-division multiple-access (FO-CDMA), a technique in which low information data rates are mapped into very-high-rate address codes (signature sequences) for the purpose of achieving random, asynchronous communications free of network control, among many users.
Journal ArticleDOI
Optical orthogonal codes: design, analysis and applications
TL;DR: Methods for the design and analysis of OOCs, using tools from projective geometry, the greedy algorithm, iterative constructions, algebraic coding theory, block design, and various other combinational disciplines, are discussed.
Proceedings Article
Optical orthogonal codes: design, analysis, and applications
TL;DR: In this article, the authors derived upper and lower bounds on the maximum possible size of an optical orthogonal code (OOC) using tools from projective geometry, the greedy algorithm, iterative constructions, algebraic coding theory, block design, and various other combinational disciplines.
Journal ArticleDOI
Code division multiple-access techniques in optical fiber networks. II. Systems performance analysis
J.A. Salehi,C.A. Brackett +1 more
TL;DR: In Part I a technique based on optical orthogonal codes was presented to establish a fiber-optic code-division multiple-access (FO-CDMA) communications system and it was shown that using an optical hard-limiter would, in general, improve system performance.
Journal ArticleDOI
Ultrafast All-Optical Synchronous Multiple Access Fiber Networks
TL;DR: Two synchronous multiple access schemes, TDMA and CDMA, are proposed for fiber optic networks using optical signal processing, using a central modelocked laser which also serves as the source for each station.
Related Papers (5)
Code division multiple-access techniques in optical fiber networks. II. Systems performance analysis
J.A. Salehi,C.A. Brackett +1 more