Journal of Systems Engineering and Electronics ›› 2011, Vol. 33 ›› Issue (3): 654-658.doi: 10.3969/j.issn.1001-506X.2011.03.37

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On the rateless character of irregular RA codes

SUN Rong1,2, LIU Jing-wei1, SUN Yue1, BAI Bao-ming1   

  1. 1. State Key Lab on ISN, Xidian University, Xi’an 710071, China;
    2. National Mobile Communications Laboratory, Southeast University, Nanjing 210096, China
  • Online:2011-03-21 Published:2010-01-03

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Abstract:

his paper introduces the construction of systematic irregular repeat accumulate (IRA) codes. The encoding line is used to describe the graph structure of IRA codes. The two interleaving strategies of IRA codes are analyzed, and it is shown that the two interleaving strategies are equal. The rateless character of IRA codes is also shown. The performances of IRA codes with different rates in binary erasure channels are simulated. Simulation results show that the IRA codes are capacity achieving. The error floor performance of IRA codes is analyzed, and the modified encoding method is presented to lower the error floor.

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