Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
Optimal degrees of freedom for the K user MIMO interference channel even with delayed CSIT. / Papazafeiropoulos, Anastasios; Ratnarajah, Tharmalingam.
IEEE Wireless Communications and Networking Conference, WCNC. Institute of Electrical and Electronics Engineers Inc., 2014. p. 543-547 6952086.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
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TY - GEN
T1 - Optimal degrees of freedom for the K user MIMO interference channel even with delayed CSIT
AU - Papazafeiropoulos, Anastasios
AU - Ratnarajah, Tharmalingam
PY - 2014/11/10
Y1 - 2014/11/10
N2 - Certain practical limitations, such as finite CSI feedback delay, make the knowledge of instantaneous perfect CSI impossible and bring the term of delayed CSIT to the forefront. In this paper, it is described how both current and delayed CSI could be exploited by generalizing the space-time interference alignment transmission algorithm (STIA) to the K (K ≥ 3) user M × N interference channel. Specifically, the degrees of freedom (DoF) gain is characterized as a function of the CSI feedback delay γ and the system parameters (K, M, N). Surprisingly, the DoF become optimal, i.e., no loss is achieved with respect to the case of perfect current CSIT, as far as the normalized CSI feedback delay is less than a specific value dependent on the number of users, and the number of transmit antennas equals to N(K - 1). The proposed algorithm reveals unprecedented properties characterizing the performance of the system by providing the limits of the multiplexing gain with relation to the feedback time delay.
AB - Certain practical limitations, such as finite CSI feedback delay, make the knowledge of instantaneous perfect CSI impossible and bring the term of delayed CSIT to the forefront. In this paper, it is described how both current and delayed CSI could be exploited by generalizing the space-time interference alignment transmission algorithm (STIA) to the K (K ≥ 3) user M × N interference channel. Specifically, the degrees of freedom (DoF) gain is characterized as a function of the CSI feedback delay γ and the system parameters (K, M, N). Surprisingly, the DoF become optimal, i.e., no loss is achieved with respect to the case of perfect current CSIT, as far as the normalized CSI feedback delay is less than a specific value dependent on the number of users, and the number of transmit antennas equals to N(K - 1). The proposed algorithm reveals unprecedented properties characterizing the performance of the system by providing the limits of the multiplexing gain with relation to the feedback time delay.
UR - http://www.scopus.com/inward/record.url?scp=84912118166&partnerID=8YFLogxK
U2 - 10.1109/WCNC.2014.6952086
DO - 10.1109/WCNC.2014.6952086
M3 - Conference contribution
AN - SCOPUS:84912118166
SP - 543
EP - 547
BT - IEEE Wireless Communications and Networking Conference, WCNC
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2014 IEEE Wireless Communications and Networking Conference, WCNC 2014
Y2 - 6 April 2014 through 9 April 2014
ER -