## Abstract

Ergodic interference alignment, as introduced by Nazer et al (NGJV), is a technique that allows high-rate communication in n-user interference networks with fast fading. It works by splitting communication across a pair of fading matrices. However, it comes with the overhead of a long time delay until matchable matrices occur: the delay is q(n2) for field size q.

In this paper, we outline two new families of schemes, called JAP and JAP-B, that reduce the expected delay, sometimes at the cost of a reduction in rate from the NGJV scheme. In particular, we give examples of good schemes for networks with few users, and show that in large n-user networks, the delay scales like q(T), where T is quadratic in n for a constant per-user rate and T is constant for a constant sum-rate. We also show that half the single-user rate can be achieved while reducing NGJV's delay from q(n2) to q((n - 1)(n - 2)).

Original language | English |
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Title of host publication | 2012 IEEE International Symposium on Information Theory Proceedings (ISIT) |

Place of Publication | NEW YORK |

Publisher | Institute of Electrical and Electronics Engineers (IEEE) |

Number of pages | 5 |

ISBN (Print) | 978-1-4673-2579-0 |

Publication status | Published - 2012 |

Event | IEEE International Symposium on Information Theory - Cambridge, MA, United States Duration: 1 Jul 2012 → 6 Jul 2012 |

### Publication series

Name | IEEE International Symposium on Information Theory |
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Publisher | IEEE |

### Conference

Conference | IEEE International Symposium on Information Theory |
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Country | United States |

City | Cambridge, MA |

Period | 1/07/12 → 6/07/12 |

## Keywords

- CHANNELS
- CAPACITY
- NETWORKS