• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 21 Issue 5
Oct.  2008
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Article Contents
ZHANG Donghong, LIAO Guisheng. Successive Interference Cancellation Algorithm Based on Gram-Schmidt Orthogonalization Algorithm[J]. Journal of Southwest Jiaotong University, 2008, 21(5): 561-565.
Citation: ZHANG Donghong, LIAO Guisheng. Successive Interference Cancellation Algorithm Based on Gram-Schmidt Orthogonalization Algorithm[J]. Journal of Southwest Jiaotong University, 2008, 21(5): 561-565.

Successive Interference Cancellation Algorithm Based on Gram-Schmidt Orthogonalization Algorithm

  • Received Date: 18 Sep 2007
  • Publish Date: 25 Oct 2008
  • A new SIC(successive interference cancellation) algorithm based on the Gram-Schmidt orthogonalization algorithm was presented.Unlike the conventional SIC algorithm,this algorithm uses an optimal despreading sequence,locally generated by the Gram-Schmidt orthogonalization of spreading sequences,to demodulate a received signal in each stage.The despreading code of the strongest user in each stage is orthogonal to the subspace spanned by the spreading code of other users,so that the multiple access interference(MAI) is fully suppressed.An approximate bit error rate(BER) formula with the amplitude mismatch was proposed,and the effect of the amplitude mismatch on the BER performance of CDMA systems was discussed.Simulations show that the new algorithm can effectively cancel MAI and improve the BER performance.

     

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