TY - GEN
T1 - Relays can provide alignment for the K-user interference channel without channel state information at the transmitters
AU - Tian, Ye
AU - Yener, Aylin
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - Channel state information at the transmitters (CSIT) is of importance for interference alignment schemes to achieve the optimal degrees of freedom (DoF) for wireless networks. This paper focuses on the K-user interference channel and shows that, employing relays between the sources and the destinations, interference alignment is possible without CSIT. Furthermore, the optimal DoF can be achieved with the help of relays. Specifically, a transmission strategy is designed and it is shown that the DoF K/2 can be achieved with a two-slot transmission strategy using either (i) one relay with K - 1 antennas, or (ii) K(K - 2) single antenna relays. It is also shown that when each relay is equipped with L antennas, we need [K(K - 2)/L 2] relays to achieve the optimal DoF.
AB - Channel state information at the transmitters (CSIT) is of importance for interference alignment schemes to achieve the optimal degrees of freedom (DoF) for wireless networks. This paper focuses on the K-user interference channel and shows that, employing relays between the sources and the destinations, interference alignment is possible without CSIT. Furthermore, the optimal DoF can be achieved with the help of relays. Specifically, a transmission strategy is designed and it is shown that the DoF K/2 can be achieved with a two-slot transmission strategy using either (i) one relay with K - 1 antennas, or (ii) K(K - 2) single antenna relays. It is also shown that when each relay is equipped with L antennas, we need [K(K - 2)/L 2] relays to achieve the optimal DoF.
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U2 - 10.1109/SPAWC.2012.6292904
DO - 10.1109/SPAWC.2012.6292904
M3 - Conference contribution
AN - SCOPUS:84868021994
SN - 9781467309714
T3 - IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
SP - 254
EP - 258
BT - 2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
T2 - 2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
Y2 - 17 June 2012 through 20 June 2012
ER -