TY - GEN
T1 - On the degrees-of-freedom of the 3-user MISO broadcast channel with hybrid CSIT
AU - Amuru, Saidhiraj
AU - Tandon, Ravi
AU - Shamai, Shlomo
PY - 2014
Y1 - 2014
N2 - The 3-user multiple-input single-output (MISO) broadcast channel (BC) with hybrid channel state information at the transmitter (CSIT) is considered. In this framework, there is perfect and instantaneous CSIT from a subset of users and delayed CSIT from the remaining users. We present new results on the sum degrees of freedom (DoF) of the 3-user MISO BC with hybrid CSIT. In particular, for the case of 2 transmit antennas, we show that with perfect CSIT from one user and delayed CSIT from the remaining two users, the optimal sum DoF is 5/3. For the case of 3 transmit antennas and the same hybrid CSIT setting, it is shown that a higher sum DoF of 9/5 is achievable and this result improves upon the best known bound. Furthermore, with 3 transmit antennas, and the hybrid CSIT setting in which there is perfect CSIT from two users and delayed CSIT from the third one, a novel scheme is presented which achieves 9/4 sum DoF. Our results also reveal new insights on how to utilize hybrid channel knowledge for multi-user scenarios.
AB - The 3-user multiple-input single-output (MISO) broadcast channel (BC) with hybrid channel state information at the transmitter (CSIT) is considered. In this framework, there is perfect and instantaneous CSIT from a subset of users and delayed CSIT from the remaining users. We present new results on the sum degrees of freedom (DoF) of the 3-user MISO BC with hybrid CSIT. In particular, for the case of 2 transmit antennas, we show that with perfect CSIT from one user and delayed CSIT from the remaining two users, the optimal sum DoF is 5/3. For the case of 3 transmit antennas and the same hybrid CSIT setting, it is shown that a higher sum DoF of 9/5 is achievable and this result improves upon the best known bound. Furthermore, with 3 transmit antennas, and the hybrid CSIT setting in which there is perfect CSIT from two users and delayed CSIT from the third one, a novel scheme is presented which achieves 9/4 sum DoF. Our results also reveal new insights on how to utilize hybrid channel knowledge for multi-user scenarios.
UR - http://www.scopus.com/inward/record.url?scp=84906568564&partnerID=8YFLogxK
U2 - 10.1109/ISIT.2014.6875211
DO - 10.1109/ISIT.2014.6875211
M3 - منشور من مؤتمر
SN - 9781479951864
T3 - IEEE International Symposium on Information Theory - Proceedings
SP - 2137
EP - 2141
BT - 2014 IEEE International Symposium on Information Theory, ISIT 2014
T2 - 2014 IEEE International Symposium on Information Theory, ISIT 2014
Y2 - 29 June 2014 through 4 July 2014
ER -