Turbo codes in DSSS systems and a method of their performance improvement in non-white additive noise

  • Authors:

  • Marek Bykowski

  • Affiliations:

  • Radiocommunications Division, Military Communication Institute, Poland

  • Venue:
  • ISPRA'07 Proceedings of the 6th WSEAS International Conference on Signal Processing, Robotics and Automation
  • Year:
  • 2007

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Abstract

In this paper performance of turbo codes with SOVA decoder over non-white channels has been examined. Researches have shown that their performance over such channels are similar to these achieved in AWGN channels. At the same time the author proposed a method that tremendously enhances its performance in such circumstances. This method applies directly to noise and exploits its predicted character (the more colored noise, the less random noise). This method is a so-called double-matched reception. It consists in matching a receiver not only to the signal (as it is in classical receivers), but also to non-white noise. In comparison with a single-matched detection the obtained gains reach a dozen or so dBs depending on the entropy of noise.