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An Energy-Based Comparison of Long-Hop and Short-Hop Routing in MIMO Networks May 31, 2010

Posted by flashbuzzer in Research.
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My fifth journal paper appeared in the IEEE Transactions on Vehicular Technology last January. You can find a pre-print on arXiv here.

Here are my thoughts on this paper’s strengths and weaknesses.

Strengths: In this paper, we compared long-hop routing and short-hop routing in a multi-antenna wireless network, where the metric of interest was the end-to-end transmission energy. Using tools from stochastic geometry and large-antenna analysis, we were able to show the energy advantage of short-hop routing in three limiting scenarios. We also considered a more practical delay-constrained scenario and showed the asymptotic advantage of long-hop routing in that case. To the best of our knowledge, this was the first theoretical study to compare hop length-based routing strategies in a MIMO network.

Weaknesses: Unfortunately, the practicality of our work was limited by the fact that we only obtained asymptotic results; for example, we considered cases where the number of transmit/receive antennas and the hop-count grew large. This was primarily due to our decision to consider a MIMO network, as the pertinent mathematical expressions were much more unwieldy than their single-antenna counterparts. Also, I was only able to obtain results for networks where the nodes were randomly distributed according to a Poisson point process. My lack of familiarity with stochastic geometry prevented me from extending our results to a much larger, and potentially more interesting, class of networks.

This was my fourth accepted IEEE journal paper and nicely capped off my graduate school career. I should also note that this paper was initially submitted to the IEEE JSAC special issue on stochastic geometry. It was justly rejected for being sparse in terms of its stochastic geometry-related contributions, but the reviewers and the AE, Martin Haenggi, offered critical comments that helped me in preparing it for re-submission to the IEEE TVT. The TVT reviewers and the AE, Mischa Dohler, also offered various comments and suggestions that greatly improved the manuscript.

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