Prime Number Based Interleaver for Multiuser Iterative IDMA Systems

In recently proposed multiple access techniques such as IDMA and OFDM-IDMA, the user separation is done by user specific interleavers in contrast to conventional CDMA scheme where user separation is assured with user-specific signature sequences. The user specific interleavers must demonstrate minimum probability of collision amongst each other in addition to other merits including minimal consumption of bandwidth, least hardware for their generation, and least memory requirement. Previously, random interleaver and other interleavers proposed by researchers is still leaving some space for further research leading to optimality of interleavers. In this paper, we propose a novel interleaver based on prime numbers for generation of user specific interleavers to remove the problem of high consumption of bandwidth. The simulation results demonstrate the optimal performance of prime interleaver (PI) apart from other merits in comparison to random and other interleavers.