2-Dimension Interleaver Design for IDMA Systems

A new design method interleavers,2-dimension interleavers,are proposed for interleave division multiple access(IDMA) systems.With a same interleaving rule named Γ,the row indices and column indices of a traditional block interleaving matrix are scrambled to obtain an interleaver,which is marked as the master interleaver.Γ is produced by a low-order PN sequence generator.Two ways are provided for generating different interleavers.One is that all interleavers are generated by the circular shifting master interleaver.The other is that different inter-leavers are generated by different Γs.Besides,we prove that the minimum distance between two adjacent bits resulted from 2-dimension interleaves is much larger than that of other schemes,such as random interleavers,power interleavers,and shiffting interleaves.The simulation results show that 2-dimension interleavers can achieve much better performance with much less resource consumption than random interleavers in IDMA systems.