Name
Abstract | ||
|---|---|---|
Channel state information at the transmitter (CSIT) is of utmost importance to manage interference in multi-user wireless networks, in which transmission rates at a high signal-to-noise ratio are characterized by (sum) degrees of freedom (DoF). Ingenious techniques have been proposed to deal with delayed CSIT, notably a scheme by Maddah-Ali and Tse, providing significant DoF with outdated CSIT. However, with most techniques, any delay in the CSIT feedback still results in a DoF loss. A notable exception is the work by Lee and Heath, allowing one to preserve the optimal DoF in the underdetermined MISO BC and IC, but for feedback delays T fb decreasing with the number of users K, up to a fraction 1/K of the channel coherence time T c . In this work, an ergodic interference alignment scheme that preserves the K/2 sum DoF of the K-user IC is proposed for T fb T c /2. It is also proven that T fb = T c /2 is the longest for which the optimal K/2 DoF can still be obtained for all K. |
Year | DOI | Venue |
|---|---|---|
2014 | 10.1109/LCOMM.2014.2323704 | IEEE Communications Letters |
Keywords | Field | DocType |
Integrated circuits,Delays,Interference,Transmitters,Coherence,Receivers,Fading | Transmitter,Wireless network,Underdetermined system,Computer science,Control theory,Ergodic theory,Communication channel,Interference (wave propagation),Coherence time,Channel state information | Journal |
Volume | Issue | ISSN |
18 | 7 | 1089-7798 |
Citations | PageRank | References |
6 | 0.46 | 11 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Yohan Lejosne | 1 | 36 | 4.24 |
| Dirk T. M. Slock | 2 | 801 | 86.45 |
| Yi Yuan-wu | 3 | 456 | 30.09 |