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

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Published/Copyright: April 12, 2011
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Journal of Optical Communications
From the journal Volume 32 Issue 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.

Keywords.: Dispersive Infrared Channel; Convolutional Coding; Multiple Access Techniques; TH-CDMA
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

Articles in the same Issue

  1. Editorial
  2. A Method to Measure Optical Parameters of the Diffraction Grating Using the Ratio of ±1 Orders Diffraction Efficiencies
  3. The Exact Planning of the GMPLS-based Metro Core Network
  4. A New TH-CDMA Scheme for Dispersive Infrared Channel and Its Performance Evaluation
  5. Performance Comparison of BB84 and B92 Satellite-Based Free Space Quantum Optical Communication Systems in the Presence of Channel Effects
  6. Performance Analysis of Free Space Optical Systems in the Presence of Channel Physical Limitations
  7. Power Assigning Method for Increasing the Number of Users in Time-spreading Optical CDMA Systems
  8. Novel Scheme of Multi-Rate Quasi-synchronous Coherent Time-spreading OCDMA System
  9. Information Processing with Length Intervals of Stationary Random Point Processes
  10. News
https://doi.org/10.1515/joc.2011.008
Keywords for this article
Dispersive Infrared Channel; Convolutional Coding; Multiple Access Techniques; TH-CDMA

Articles in the same Issue

  1. Editorial
  2. A Method to Measure Optical Parameters of the Diffraction Grating Using the Ratio of ±1 Orders Diffraction Efficiencies
  3. The Exact Planning of the GMPLS-based Metro Core Network
  4. A New TH-CDMA Scheme for Dispersive Infrared Channel and Its Performance Evaluation
  5. Performance Comparison of BB84 and B92 Satellite-Based Free Space Quantum Optical Communication Systems in the Presence of Channel Effects
  6. Performance Analysis of Free Space Optical Systems in the Presence of Channel Physical Limitations
  7. Power Assigning Method for Increasing the Number of Users in Time-spreading Optical CDMA Systems
  8. Novel Scheme of Multi-Rate Quasi-synchronous Coherent Time-spreading OCDMA System
  9. Information Processing with Length Intervals of Stationary Random Point Processes
  10. News
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