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On the Spread of Random Interleaver

Information Theory 2007-07-16 v1 math.IT

Abstract

For a given blocklength we determine the number of interleavers which have spread equal to two. Using this, we find out the probability that a randomly chosen interleaver has spread two. We show that as blocklength increases, this probability increases but very quickly converges to the value 1e20.86471-e^{-2} \approx 0.8647. Subsequently, we determine a lower bound on the probability of an interleaver having spread at least ss. We show that this lower bound converges to the value e2(s2)2e^{-2(s-2)^{2}}, as the blocklength increases.

Cite

@article{arxiv.cs/0510067,
  title  = {On the Spread of Random Interleaver},
  author = {Arya Mazumdar and Adrish Banerjee and A K Chaturvedi},
  journal= {arXiv preprint arXiv:cs/0510067},
  year   = {2007}
}

Comments

5 pages, published in Proceedings of IEEE International Symposium on Information Theory 2005, Adelaide, Australia