제어로봇시스템학회:학술대회논문집

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Decision Feedback Equalization Receiver for DS-CDMA with Turbo Coded Systems

  • Chompoo, T. (Research Center for Communications and Information Technology (ReCCIT), and Department of Information Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang) ;
  • Benjangkaprasert, C. (Research Center for Communications and Information Technology (ReCCIT), and Department of Information Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang) ;
  • Sangaroon, O. (Research Center for Communications and Information Technology (ReCCIT), and Department of Information Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang) ;
  • Janchitrapongvej, K. (Research Center for Communications and Information Technology (ReCCIT), and Department of Information Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang)
  • Published : 2005.06.02
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Abstract

In this paper, adaptive equalizer receiver for a turbo code direct sequence code division multiple access (DSCDMA) by using least mean square (LMS) adaptive algorithm is presented. The proposed adaptive equalizer is using soft output of decision feedback adaptive equalizer (DFE) to examines the output of the equalizer and the Log- maximum a posteriori (Log-MAP) algorithm for the turbo decoding process of the system. The objective of the proposed equalizer is to minimize the bit error rate (BER) of the data due to the disturbances of noise and intersymbol interference (ISI)phenomenon on the channel of the DS-CDMA digital communication system. The computer program simulation results shown that the proposed soft output decision feedback adaptive equalizer provides a good BER than the others one such as conventional adaptive equalizer, infinite impulse response adaptive equalizer.

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