Access timing controlled direct-detection optical cdma systems with ppm signaling

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We propose an access timing controlled directdetection optical code-division multiple-access (ATC-CDMA) system with pulse position modulation (PPM) signaling to improve the performance of direct-detection optical CDMA systems with PPM signaling without narrowing the chip width. In the ATC-CDMA system, each user is allowed to access the network Tu times out of Ti times according to the scheduled access timing pattern, and the number of users accessing the network simultaneously is decreased; the effect of the channel crosstalk is thus reduced. We analyze the performance of the proposed system under the assumption of Poisson shot noise model for the receiver photodetector including the noise due to the detector dark currents. We compare the performance of the ATC-CDMA system using PPM signaling with that of a conventional CDMA system using PPM signaling under a fixed bit rate, almost the same chip width and a constraint on the transmitted energy per pulse. It is shown that the ATC-CDMA system has better performance than the conventional CDMA system. Moreover, it is shown that the ATC-CDMA system with fewer slots per symbol and lower access timing probability to the network has better performance at the fixed bit rate and the chip width. Therefore, controlling an access timing of each user to the network is shown to be more effective for improving the bit error probability performance than the pulse position multiplicity with the increase in the number of slots per symbol under the constraint on the bit rate and the chip width on direct-detection optical CDMA systems with PPM signaling.

Original languageEnglish
Pages (from-to)1392-1399
Number of pages8
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
VolumeE79-A
Issue number9
Publication statusPublished - 1996

Fingerprint

Code Division multiple Access
Optical systems
Optical System
Code division multiple access
Timing
Pulse Position Modulation
Pulse position modulation
Chip
Optical Code Division multiple Access
Shot Noise
Shot noise
Dark Current
Dark currents
Photodetector
Crosstalk
Error Probability
Photodetectors
Siméon Denis Poisson
Multiplicity
Receiver

Keywords

  • ATC-CDMA
  • CDMA
  • PPM
  • Prime sequence codes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Hardware and Architecture
  • Information Systems

Cite this

@article{d92eae7870d94765b2baed8fc01046cb,
title = "Access timing controlled direct-detection optical cdma systems with ppm signaling",
abstract = "We propose an access timing controlled directdetection optical code-division multiple-access (ATC-CDMA) system with pulse position modulation (PPM) signaling to improve the performance of direct-detection optical CDMA systems with PPM signaling without narrowing the chip width. In the ATC-CDMA system, each user is allowed to access the network Tu times out of Ti times according to the scheduled access timing pattern, and the number of users accessing the network simultaneously is decreased; the effect of the channel crosstalk is thus reduced. We analyze the performance of the proposed system under the assumption of Poisson shot noise model for the receiver photodetector including the noise due to the detector dark currents. We compare the performance of the ATC-CDMA system using PPM signaling with that of a conventional CDMA system using PPM signaling under a fixed bit rate, almost the same chip width and a constraint on the transmitted energy per pulse. It is shown that the ATC-CDMA system has better performance than the conventional CDMA system. Moreover, it is shown that the ATC-CDMA system with fewer slots per symbol and lower access timing probability to the network has better performance at the fixed bit rate and the chip width. Therefore, controlling an access timing of each user to the network is shown to be more effective for improving the bit error probability performance than the pulse position multiplicity with the increase in the number of slots per symbol under the constraint on the bit rate and the chip width on direct-detection optical CDMA systems with PPM signaling.",
keywords = "ATC-CDMA, CDMA, PPM, Prime sequence codes",
author = "Tomoaki Ohtsuki and Iwao Sasase and Shinsaku Mori",
year = "1996",
language = "English",
volume = "E79-A",
pages = "1392--1399",
journal = "IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences",
issn = "0916-8508",
publisher = "Maruzen Co., Ltd/Maruzen Kabushikikaisha",
number = "9",

}

TY - JOUR

T1 - Access timing controlled direct-detection optical cdma systems with ppm signaling

AU - Ohtsuki, Tomoaki

AU - Sasase, Iwao

AU - Mori, Shinsaku

PY - 1996

Y1 - 1996

N2 - We propose an access timing controlled directdetection optical code-division multiple-access (ATC-CDMA) system with pulse position modulation (PPM) signaling to improve the performance of direct-detection optical CDMA systems with PPM signaling without narrowing the chip width. In the ATC-CDMA system, each user is allowed to access the network Tu times out of Ti times according to the scheduled access timing pattern, and the number of users accessing the network simultaneously is decreased; the effect of the channel crosstalk is thus reduced. We analyze the performance of the proposed system under the assumption of Poisson shot noise model for the receiver photodetector including the noise due to the detector dark currents. We compare the performance of the ATC-CDMA system using PPM signaling with that of a conventional CDMA system using PPM signaling under a fixed bit rate, almost the same chip width and a constraint on the transmitted energy per pulse. It is shown that the ATC-CDMA system has better performance than the conventional CDMA system. Moreover, it is shown that the ATC-CDMA system with fewer slots per symbol and lower access timing probability to the network has better performance at the fixed bit rate and the chip width. Therefore, controlling an access timing of each user to the network is shown to be more effective for improving the bit error probability performance than the pulse position multiplicity with the increase in the number of slots per symbol under the constraint on the bit rate and the chip width on direct-detection optical CDMA systems with PPM signaling.

AB - We propose an access timing controlled directdetection optical code-division multiple-access (ATC-CDMA) system with pulse position modulation (PPM) signaling to improve the performance of direct-detection optical CDMA systems with PPM signaling without narrowing the chip width. In the ATC-CDMA system, each user is allowed to access the network Tu times out of Ti times according to the scheduled access timing pattern, and the number of users accessing the network simultaneously is decreased; the effect of the channel crosstalk is thus reduced. We analyze the performance of the proposed system under the assumption of Poisson shot noise model for the receiver photodetector including the noise due to the detector dark currents. We compare the performance of the ATC-CDMA system using PPM signaling with that of a conventional CDMA system using PPM signaling under a fixed bit rate, almost the same chip width and a constraint on the transmitted energy per pulse. It is shown that the ATC-CDMA system has better performance than the conventional CDMA system. Moreover, it is shown that the ATC-CDMA system with fewer slots per symbol and lower access timing probability to the network has better performance at the fixed bit rate and the chip width. Therefore, controlling an access timing of each user to the network is shown to be more effective for improving the bit error probability performance than the pulse position multiplicity with the increase in the number of slots per symbol under the constraint on the bit rate and the chip width on direct-detection optical CDMA systems with PPM signaling.

KW - ATC-CDMA

KW - CDMA

KW - PPM

KW - Prime sequence codes

UR - http://www.scopus.com/inward/record.url?scp=0030232057&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030232057&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0030232057

VL - E79-A

SP - 1392

EP - 1399

JO - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

JF - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

SN - 0916-8508

IS - 9

ER -