Performance Analysis of CDMA-OFDM System via Cooperative Communication in Wireless Fading Environment

  • Jeong Hwi-Jae (Department of Electrical Engineering, University of Ulsan) ;
  • Kong Hyung-Yun (Department of Electrical Engineering, University of Ulsan)
  • Published : 2006.09.01

Abstract

Signal distortion due to the path loss, shadow, and multi-path fading is very serious in radio channel. In this paper, we propose CDMA-OFDM cooperative communication system based on DFP(Decode and Forward Protocol) to overcome these phenomena using spread spectrum technique, orthogonal sub-carrier, and the space diversity. We simulated proposed system under Rayleigh flat fading channel environment. A variety of simulation results reveal the cooperation can provide performance gain of up to 12 dB over direct communications in ideal inter-user case at BER of $10^{-3}$. And we can also confirm variation of diversity effect as channel environment changes.

Keywords

CDMA-OFDM;Cooperative Communication;Diversity Decode and Forward;MRC;ML Detect

References

  1. R.v. Nee, R. Prasad, OFDM for Wireless Multimedia Communications, Artech House, 2000
  2. A. Nosratinia, A. Hedayat, and T.E. Hunter, 'Cooperative communication in wireless networks', IEEE Communications Magazine, vol. 42, no. 10, pp. 74-80, Oct. 2004 https://doi.org/10.1109/MCOM.2004.1341264
  3. K. Fazel, S. Kaiser, Multi-carrier Spreading Spectrum & Related Topics, Kluwer Acadamic Publishers, 2000
  4. J. N. Laneman, D. N. C. Tse, and G. W. Wornell, 'Cooperative diversity in wireless networks: efficient protocols and outage behavior', IEEE Transactions on Information Theory, vol. 50, Issue 12, pp. 3062-3080, Dec. 2004 https://doi.org/10.1109/TIT.2004.838089
  5. S. M. Alamouti, 'A simple transmit diversity technique for Wireless Commnication', IEEE J. Select. Areas Commun., vol. 16, pp. 1451-1458, Oct. 1998 https://doi.org/10.1109/49.730453
  6. M. K. Simon, M. S. Alouini, Digital Communication over Fading Channels, Second Edition, John Wiley & Sons, Inc., 2005