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  • Frenger, Pål, 1968, et al. (author)
  • Combined coding and spreading in CDMA systems using maximum free distance convolutional codes
  • 1998
  • In: Proceedings IEEE Vehicular Technology Conference, Ottawa, Canada. ; 3, s. 2497-2501
  • Conference paper (peer-reviewed)abstract
    • In CDMA systems maximum theoretical performance can be obtained by spreading with low-rate error control codes. Previously, orthogonal and superorthogonal codes have been proposed for this purpose. We present a family of rate-compatible low-rate convolutional codes with maximum free distance. The performance of these codes for spectrum spreading in a CDMA system is evaluated and shown to outperform that of orthogonal and superorthogonal codes as well as conventional coding/spreading schemes. We also show that our low-rate codes will give simple encoder and decoder implementation. With these codes any 1/n rate can be obtained regardless of the constraint length, resulting in a more flexible and powerful scheme than those proposed up to now.
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Type of publication
conference paper (1)
Type of content
peer-reviewed (1)
Author/Editor
Ottosson Gadd, Tony, ... (1)
Frenger, Pål, 1968 (1)
Orten, Pål, 1966 (1)
University
Chalmers University of Technology (1)
Language
English (1)
Research subject (UKÄ/SCB)
Natural sciences (1)
Year
1998 (1)

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