Joint multilevel turbo equalization and continuous phase frequency shift keying

  • Authors:

  • Oguz Bayat;Niyazi Odabasioglu;Onur Osman;Osman N. Ucan;Masoud Salehi;Bahram Shafai

  • Affiliations:

  • Electronics and Communication Engineering Department, Beykent University, Buyukcekmece, Istanbul, Turkey;Electrical and Electronics Engineering Department, Istanbul University, Avcilar, Istanbul, Turkey;Electronics and Telecommunications Engineering Department, Engineering Faculty, Halic University, Sisli, Istanbul, Turkey;Electrical and Electronics Engineering Department, Istanbul University, Avcilar, Istanbul, Turkey;Electrical and Computer Engineering, Northeastern University, Boston, MA;Electrical and Computer Engineering, Northeastern University, Boston, MA

  • Venue:
  • EURASIP Journal on Wireless Communications and Networking
  • Year:
  • 2008

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Abstract

A novel type of turbo coded modulation scheme, called multilevel turbo coded-continuous phase frequency shift keying (MLTC-CPFSK), is designed to improve the overall bit error rate (BER) and bandwidth efficiency. Then, this scheme is combined with a new double decision feedback equalizer (DDFE) to remove the interference and to enhance BER performance for the intersymbol interference (ISI) channels. The entire communication scheme is called multilevel turbo equalization-continuous phase frequency shift keying (MLTEQ-CPFSK). In these schemes, parallel input data sequences are encoded using the multilevel scheme and mapped to CPFSK signals to obtain a powerful code with phase continuity over the air. The performances of both MLTC-CPFSK and MLTEQ-CPFSK systems were simulated over nonfrequency and frequency-selective channels, respectively. The superiority of the two level turbo codes with 4CPFSK modulation is shown against the trellis-coded 4CPFSK, multilevel convolutional coded 4CPFSK, and TTCM schemes. Finally, the bit error rate curve of MLTEQ-CPFSK system over Proakis B channel is depicted and ISI cancellation performance of DDFE equalizer is shown against linear and decision feedback equalizers.