Turbo-detected unequal error protection irregular convolutional codes designed for the wideband advanced multirate speech codec

J. Wang, N. S. Othman, J. Kliewer, L. L. Yang, L. Hanzo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


since the different bits of multimedia information, such as speech and video, have different error sensitivity, efficient unequalprotection channel coding schemes have to be used to ensure that the perceptually more important bits benefit from more powerful protection. Furthermore, in the context of turbo detection the channel codes should also match the characteristics of the channel for the sake of attaining a good convergence performance. In this paper, we address this design dilemma by using irregular convolutional codes (IRCCs) which constitute a family of different-rate subcodes. we benefit from the high design flexibility of IRCCs and hence excellent convergence properties are maintained while having unequal error protection capabilities matched to the requirements of the source. An EXIT chart based design procedure is proposed and used in the context of protecting the different-sensitivity speech bits of the wideband AMR speech codec. As a benefit, the unequalprotection system using IRCCs exhibits an SNR advantage of about 0.4 dB over the equal-protection system employing regular convolutional codes, when communicating over a Gaussian channel.

Original languageEnglish (US)
Title of host publicationVTC 2005-Fall
Subtitle of host publicationMid Way Through the Decade - Technology Past, Present and Future
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)0780391527
StatePublished - Jan 1 2005
Event62nd Vehicular Technology Conference, VTC 2005 - Dallas, United States
Duration: Sep 25 2005Sep 28 2005

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252


Other62nd Vehicular Technology Conference, VTC 2005
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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