TY - JOUR
T1 - Degrees of freedom region of the MIMO interference channel with output feedback and delayed CSIT
AU - Tandon, Ravi
AU - Mohajer, Soheil
AU - Poor, H. Vincent
AU - Shamai, Shlomo
PY - 2013
Y1 - 2013
N2 - The two-user multiple-input multiple-output (MIMO) interference channel (IC) with arbitrary numbers of antennas at each terminal is considered and the degrees of freedom ( DoF}) region is characterized in the presence of noiseless channel output feedback from each receiver to its respective transmitter and availability of delayed channel state information at the transmitters (CSIT). It is shown that having output feedback and delayed CSIT can strictly enlarge the DoF region of the MIMO IC when compared to the case in which only delayed CSIT is present. The proposed coding schemes that achieve the corresponding DoF region with feedback and delayed CSIT utilize both resources, i.e., feedback and delayed CSIT in a nontrivial manner. It is also shown that the DoF region with local feedback and delayed CSIT is equal to the DoF region with global feedback and delayed CSIT, i.e., local feedback and delayed CSIT is equivalent to global feedback and delayed CSIT from the perspective of the DoF region. The converse is proved for a stronger setting in which the channels to the two receivers need not be statistically equivalent.
AB - The two-user multiple-input multiple-output (MIMO) interference channel (IC) with arbitrary numbers of antennas at each terminal is considered and the degrees of freedom ( DoF}) region is characterized in the presence of noiseless channel output feedback from each receiver to its respective transmitter and availability of delayed channel state information at the transmitters (CSIT). It is shown that having output feedback and delayed CSIT can strictly enlarge the DoF region of the MIMO IC when compared to the case in which only delayed CSIT is present. The proposed coding schemes that achieve the corresponding DoF region with feedback and delayed CSIT utilize both resources, i.e., feedback and delayed CSIT in a nontrivial manner. It is also shown that the DoF region with local feedback and delayed CSIT is equal to the DoF region with global feedback and delayed CSIT, i.e., local feedback and delayed CSIT is equivalent to global feedback and delayed CSIT from the perspective of the DoF region. The converse is proved for a stronger setting in which the channels to the two receivers need not be statistically equivalent.
KW - Delayed channel state information at the transmitters (CSIT)
KW - interference channel (IC)
KW - multiple-input multiple-output (MIMO)
KW - output feedback
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U2 - 10.1109/TIT.2012.2226700
DO - 10.1109/TIT.2012.2226700
M3 - Article
AN - SCOPUS:84873927273
SN - 0018-9448
VL - 59
SP - 1444
EP - 1457
JO - IEEE Transactions on Information Theory
JF - IEEE Transactions on Information Theory
IS - 3
M1 - 6341083
ER -