Adaptive and Iterative GSC/MRC Switching Techniques Based on CRC Error Detection for AF Relaying System

  • Authors:
  • Jong Sung Lee;Dong In Kim

  • Affiliations:
  • School of Information and Communication Engineering, Sungkyunkwan University, Suwon, Korea 440-746;School of Information and Communication Engineering, Sungkyunkwan University, Suwon, Korea 440-746

  • Venue:
  • ICCSA '09 Proceedings of the International Conference on Computational Science and Its Applications: Part II
  • Year:
  • 2009

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Abstract

In cooperative amplify-and-forward (AF) system using spatially distributed relays, there exist some relay paths degrading performance because of noise enhancement. In order to alleviate the deteriorating effect of such paths, we propose adaptive generalized selection combining (GSC)/MRC and iterative GSC/MRC switching techniques based on cyclic-redundancy-check (CRC) error detection. The adaptive GSC (with order N )/MRC switching with K relays operates as follows: the destination performs initial data detection by combining the strongest N ( K + 1) paths, and CRC is checked for error detection. If an error is detected, MRC with all the K + 1 paths is then performed. To further generalize, the iterative GSC/MRC is employed in an iterative manner conditioned on successive error detection. Our simulation results show that the proposed schemes show better diversity performance than conventional one in terms of the bit-error rate (BER), when an appropriate CRC generator polynomial is used depending on the frame size. The diversity gain of the proposed schemes become far prominent when imperfect channel estimation is assumed at the destination.