Journal ArticleDOI
Low-rate super-orthogonal channel coding for fiber-optic CDMA communication systems
TLDR
It is shown that the proposed method significantly outperforms the uncoded systems for various receiver structures such as a correlator with and without hard-limiter and chip-level detector and in the presence of different values of dark current.Abstract:
In this paper, we consider using practical low-rate error correcting codes in fiber-optic code division multiple-access (CDMA) communication systems. To this end, a different method of low-rate channel coding is proposed. As opposed to the conventional coding schemes, this method does not require any further bandwidth expansion for error correction in fiber-optic CDMA communication systems. The low-rate channel codes that are used for demonstrating the capabilities of the proposed method are super-orthogonal codes. These codes are near optimal and have a relatively low complexity. We evaluate the upper bounds on the bit-error probability of the proposed coded fiber-optic CDMA system assuming both on-off keying and binary pulse position modulation schemes. It is shown that the proposed method significantly outperforms the uncoded systems for various receiver structures such as a correlator with and without hard-limiter and chip-level detector. Furthermore, the performance of the proposed coded fiber-optic CDMA system is also evaluated in the presence of different values of dark current.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
Atmospheric optical CDMA communication systems via optical orthogonal codes
TL;DR: From the analytical results, it can be deduce that the chip-level receiver outperforms a simple correlator in the absence or weak atmospheric fading; however, in a strong fading environment, thesimple correlator outperforms the chip -level receiver.
Journal ArticleDOI
Experimental demonstration of OCDMA transmission using a three-dimensional (time-wavelength-polarization) codeset
TL;DR: In this paper, a three-dimensional (3-dimensional) optical code-division multiple access (OCDMA) transmission system that encodes data on time, wavelength, and polarization is presented.
Journal ArticleDOI
On error-correction coding for CDMA PON
Henrik Lundqvist,Gunnar Karlsson +1 more
TL;DR: This work investigates the performance of low-complexity OCDMA systems with a realistic model of noise and interference and considers forward-error correction (FEC) and soft decoding using standard error-correcting codes to improve the performance.
Journal ArticleDOI
Comparative analysis of the traffic performance of fiber-impairment limited WDM and hybrid OCDM/WDM networks
TL;DR: This paper analyzes and compares the traffic performance of wavelength-division multiplexing (WDM) and hybrid OCDM/WDM-based optical networks and indicates that fiber nonlinearity affects the trafficperformance more severely compared to fiber dispersion.
References
More filters
Book
Cdma: Principles of Spread Spectrum Communication
TL;DR: Generating Pseudorandom Signals (Pseudonoise) from PseudOrandom Sequences by Modulation and Demodulation of Spread Spectrum Signals in Multipath and Multiple Access Interference.
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
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
Performance comparison of asynchronous and synchronous code-division multiple-access techniques for fiber-optic local area networks
TL;DR: It is shown that the large bandwidth expansion required by spread-spectrum techniques, such as CDMA, can be accommodated by using a fiber-optic channel for transmission and incoherent optical signal processing for code generation and correlation.
Journal ArticleDOI
Chip-level detection in optical code division multiple access
TL;DR: In this paper, a new detector called the chip-level receiver was proposed for ON-OFF keying (OOK) and pulse-position modulation (PPM) schemes, that utilize this receiver, and an exact bit error rate was evaluated taking into account the effect of both multiple-user interference and receiver shot noise.
Related Papers (5)
Code division multiple-access techniques in optical fiber networks. II. Systems performance analysis
J.A. Salehi,C.A. Brackett +1 more