Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Online SNR Estimation for Turbo Coded Multicode DS/SS Systems

  • Takizawa, Ken-ichi (Department of Electrical and Electronic Engineering, Niigata University) ;
  • Shigenobu Sasaki (Department of Electrical and Electronic Engineering, Niigata University) ;
  • Jie Zhou (Department of Electrical and Electronic Engineering, Niigata University) ;
  • Shogo Muramatsu (Department of Electrical and Electronic Engineering, Niigata University) ;
  • Hisakazu Kikuchi (Department of Electrical and Electronic Engineering, Niigata University)
  • Published : 2002.07.01
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Abstract

In this paper, an online SNR estimator is derived for turbo coded multicode DS/SS systems in Nakagami fading channels. The multicode DS/SS approach is one of promising solutions to obtain higher-rate data transmission in DS/SS technologies. Turbo coding has paid much attention because of the significant improvements on error rate performances in various communication systems including multicode DS/SS systems. However, in the turbo decoding, channel state information, especially signal-to-noise ratio (SNR) at the correlator outputs, is desired in order to obtain such improvements. We evaluate the accuracy of the derived SNR estimation. It is shown that the bit error rate performance using our SNR estimation is close to the performance with perfect knowledge of channel state information.

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