Startseite A New TH-CDMA Scheme for Dispersive Infrared Channel and Its Performance Evaluation
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A New TH-CDMA Scheme for Dispersive Infrared Channel and Its Performance Evaluation

  • Mazda Hamdi EMAIL logo und Masoumeh Nasiri-Kenari
Veröffentlicht/Copyright: 12. April 2011
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Journal of Optical Communications
Aus der Zeitschrift Band 32 Heft 1

Abstract

Infrared indoor wireless communications using nondirected links are subject to severe multipath distortion which causes intersymbol interference (ISI). To lessen multipath distortion effect and thereby to improve the system performance, in this paper, we consider a new time-hopping based multiple access scheme for this channel, in which one pulse is transmitted in each bit interval. The position of the pulse is determined based on the output of a low rate error correcting code along with the user's dedicated PN code. We evaluate the multiple access performance of the system for correlation receiver considering background noise, dark current, and thermal noise. We compare the performance of our proposed multiple access scheme with those of the previously introduced code division multiple access schemes for infrared communications, like CDMA and Frame Time Hopping (FTH). Our results show that, for the same bandwidth and bit rate, the proposed system substantially excels the other methods in term of bit error rate, or equivalently the number of the users supported at a fixed bit error rate.


Corresponding author: Mazda Hamdi, Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran.

Received: 2010-06-10
Accepted: 2010-10-10
Published Online: 2011-04-12
Published in Print: 2011-April

Copyright © 2011 De Gruyter

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