BPSK and QPSK Modulation Techniques with Optimum Tree Based Interleaver in Iterative IDMA Systems
DOI:
https://doi.org/10.18486/ijcsnt/1.1.005Keywords:
Tree Based Interleaver, Random Interleaver, Multiuser Detection, AWGN Channel, IDMA receiver, BER, Modulation TechniquesAbstract
In Interleave-Division Multiple-Access (IDMA) scheme, user specific interleavers are employed as the only means for user separation. It is well established fact that these interleavers must have property of orthogonality amongst each other. The interleavers are, therefore, referred has the heart of IDMA system. The researchers have proposed various non-orthogonal interleavers in the literature which are easy to generate and have near-zero collision property. The Tree Based Interleaver (TBI) is one of those non-orthogonal interleavers which not only reduces the bandwidth requirement in comparison to that required in case of Random Interleavers (RI) but also reduces computational complexity drastically when compared with that of master random interleavers. The memory requirement at receiver end and its cost problem are also solved by tree based interleaver with further reduction of the amount of information exchange between mobile stations and base stations required to specify the user-specific interleavers. In this paper, the performance analysis of iterative IDMA receivers have been evaluated with BPSK & QPSK modulation techniques employing tree based interleavers and random interleavers, as representative of non-orthogonal interleaver, in uncoded and rate 1/2 covolutionally coded conditions with Additive White Gaussian Noise (AWGN) channel. In the simulation results, the IDMA system with QPSK modulation techniques employing TBI outperforms the Random Interleavers optimally.
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