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A new TH-CDMA scheme for dispersive infrared channel and its performance evaluation

Hamdi, M ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1515/JOC.2011.008
  3. Publisher: 2011
  4. Abstract:
  5. 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. Copyright
  6. Keywords:
  7. Multiple access techniques ; Background noise ; Bit rates ; Convolutional coding ; Correlation receivers ; Dispersive infrared ; Dispersive infrared channel ; Error correcting code ; Frame time hopping ; Indoor wireless communications ; Infrared communication ; Low rates ; Multipath distortion ; Multiple access scheme ; Multiple access techniques ; Multiple-access performance ; Performance evaluation ; PN code ; TH-CDMA ; Time-hopping ; Bit error rate ; Broadband networks ; Intersymbol interference ; Optical communication ; Wireless telecommunication systems ; Code division multiple access
  8. Source: Journal of Optical Communications ; Volume 32, Issue 1 , 2011 , Pages 21-36 ; 01734911 (ISSN)
  9. URL: http://www.degruyter.com/view/j/joc.2011.32.issue-1/joc.2011.008/joc.2011.008.xml