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Ergodic interference alignment (2009)
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| Venue: | in Proceedings of the International Symposium on Information Theory (ISIT 2009), (Seoul, South Korea |
| Citations: | 95 - 24 self |
BibTeX
@INPROCEEDINGS{Nazer09ergodicinterference,
author = {Bobak Nazer and Michael Gastpar and Syed Ali Jafar and Sriram Vishwanath},
title = {Ergodic interference alignment},
booktitle = {in Proceedings of the International Symposium on Information Theory (ISIT 2009), (Seoul, South Korea},
year = {2009}
}
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Abstract
Abstract—Consider a K-user interference channel with timevarying fading. At any particular time, each receiver will see a signal from most transmitters. The standard approach to such a scenario results in each transmitter-receiver pair achieving a rate proportional to 1 the single user rate. However, given two K well chosen time indices, the channel coefficients from interfering users can be made to exactly cancel. By adding up these two signals, the receiver can see an interference-free version of the desired transmission. We show that this technique allows each user to achieve at least half its interference-free ergodic capacity at any SNR. Prior work was only able to show that half the interference-free rate was achievable as the SNR tended to infinity. We examine a finite field channel model and a Gaussian channel model. In both cases, the achievable rate region has a simple description and, in the finite field case, we prove it is the ergodic capacity region. I.
Keyphrases
ergodic interference alignment interference-free rate particular time standard approach desired transmission prior work interference-free ergodic capacity k-user interference channel gaussian channel model simple description rate proportional single user rate chosen time index interference-free version finite field case scenario result channel coefficient achievable rate region transmitter-receiver pair finite field channel model ergodic capacity region
