The Shifting Interleaver Design Based on PN Sequence for IDMA Systems

The interleave division multiple access (IDMA) relies on the interleavers as the only means to separate users. In this paper, we analyze the multiple access interference (MAI) performance of interleavers and propose a new design method for interleavers with lower complexity and less memory consumption: shifting interleavers. A series of interleavers can be generated by circular shifting a specific pseudo noise (PN) interleaver, which is generated by a PN sequence generator. Thus, the architecture of the proposed interleaver is much simpler than that of other interleaver schemes for IDMA systems. The simulation results show that shifting interleavers can achieve the same performance with much less resource consumption compared to random interleavers in the IDMA systems.