TY - JOUR
T1 - Retrospective interference alignment over interference networks
AU - Maleki, Hamed
AU - Jafar, Syed Ali
AU - Shamai, Shlomo
N1 - Funding Information: Manuscript received June 10, 2011; revised October 22, 2011; accepted December 03, 2011. Date of publication December 21, 2011; date of current version May 11, 2012. The work of S. Jafar and H. Maleki was supported by the Office of Naval Research (ONR) under Grant N00014-12-1-0067 and by the National Science Foundation (NSF) Computing and Communication Foundations (CCF) under Grants 0546860 and 0830809. The work of S. Shamai was supported by the Israel Science Foundation (ISF). The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Dong In Kim.
PY - 2012
Y1 - 2012
N2 - Maddah-Ali and Tse recently introduced the idea of retrospective interference alignment, i.e., achieving interference alignment with only outdated (stale) channel state information at the transmitter (CSIT), in the context of the vector broadcast channel. Since the scheme relies on the centralized transmitter's ability to reconstruct all the interference seen in previous symbols, it is not clear if retrospective interference alignment can be applied in interference networks consisting of distributed transmitters and receivers, where interference is contributed by multiple transmitters, each of whom can reconstruct only the part of the interference caused by themselves. In this work, we prove that even in such settings, retrospective interference alignment is feasible. Specifically, we show that it is possible to achieve more than 1 degrees of freedom (DoF) based on only delayed CSIT in the 3-user interference channel and the 2-user X channel consisting of only single antenna nodes. Retrospective interference alignment is also shown to be possible in other settings, such as the 2-user multiple-input and multiple-output (MIMO) interference channel and with delayed channel output feedback.
AB - Maddah-Ali and Tse recently introduced the idea of retrospective interference alignment, i.e., achieving interference alignment with only outdated (stale) channel state information at the transmitter (CSIT), in the context of the vector broadcast channel. Since the scheme relies on the centralized transmitter's ability to reconstruct all the interference seen in previous symbols, it is not clear if retrospective interference alignment can be applied in interference networks consisting of distributed transmitters and receivers, where interference is contributed by multiple transmitters, each of whom can reconstruct only the part of the interference caused by themselves. In this work, we prove that even in such settings, retrospective interference alignment is feasible. Specifically, we show that it is possible to achieve more than 1 degrees of freedom (DoF) based on only delayed CSIT in the 3-user interference channel and the 2-user X channel consisting of only single antenna nodes. Retrospective interference alignment is also shown to be possible in other settings, such as the 2-user multiple-input and multiple-output (MIMO) interference channel and with delayed channel output feedback.
KW - Degrees of freedom (DoF)
KW - X channel
KW - interference channel
KW - retrospective interference alignment
UR - http://www.scopus.com/inward/record.url?scp=84861164037&partnerID=8YFLogxK
U2 - 10.1109/JSTSP.2011.2181155
DO - 10.1109/JSTSP.2011.2181155
M3 - مقالة
SN - 1932-4553
VL - 6
SP - 228
EP - 240
JO - IEEE Journal on Selected Topics in Signal Processing
JF - IEEE Journal on Selected Topics in Signal Processing
IS - 3
M1 - 6111234
ER -