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Adaptive multilevel code selection and MUI cancellation for DS/CDMA over fading channel

Adaptive multilevel code selection and MUI cancellation for DS/CDMA over fading channel

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  • Author(s): A. Saifuddin 1  and  R. Kohno 2
    • View affiliations
    • Affiliations: 1: Kashima Space Research Center, Ministry of Post & Telecommunication, Ibaraki, Japan
      2: Division of Electrical and Computer Engineering, Yokohama National University, Yokohama, Japan
  • Source: Volume 146, Issue 1, February 1999, p. 35 – 42
    DOI:  10.1049/ip-com:19990013 , Print ISSN 1350-2425, Online ISSN 1359-7019
© IEE
Published

For transmission of speech or multimedia information in a time-varying mobile channel, fixed rate codes are normally used designed for average or worst channel conditions. However, fixed rate codes fail to explore the time-varying nature of the mobile channel. In their previous work the authors have shown that a multilevel code, when used in conjunction with multiuser interference (MUI) cancellation in cascade, yields better performance than a conventional coded modulation scheme applied to CDMA. They show that, when multilevel codes are changed with varying channel conditions (i.e. are chosen adaptively according to the channel state information (CSI)), throughput (average number of information bits per symbol duration) can be increased without too much performance degradation. Code selection criteria as well as some codes with appropriate thresholds are also presented.

Inspec keywords: land mobile radio; radiofrequency interference; time-varying channels; spread spectrum communication; interference suppression; code division multiple access; multiuser channels; fading channels; voice communication; adaptive codes; multimedia communication

Other keywords: fading channel; speech transmission; multiuser interference cancellation; thresholds; throughput; channel state information; fixed rate codes; MUI cancellation; worst channel conditions; average channel conditions; DS/CDMA; multimedia information; time-varying mobile channel; coded modulation; performance; adaptive multilevel code selection

Subjects: Multimedia communications; Mobile radio systems; Codes; Electromagnetic compatibility and interference; Multiple access communication

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