TY - GEN
T1 - Max-min weighted SIR for MIMO downlink system
T2 - 2010 IEEE International Symposium on Information Theory, ISIT 2010
AU - Cai, Desmond W.H.
AU - Quek, Tony Q.S.
AU - Tan, Chee Wei
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2010
Y1 - 2010
N2 - Designing fast algorithms that adapt the transmit and receive power and beamformers to optimize performance for different users is important in wireless MIMO downlink systems. This paper studies the max-min weighted SIR problem in the downlink, where multiple users are weighted according to priority and are subject to a total power constraint. The difficulty of this nonconvex problem is compounded by the coupling in the transmit and receive beamformers, thereby making it hard to optimize in a distributed fashion. We first show that this problem can be optimally and efficiently computed using a fast algorithm when the channels are rank-one. The optimal transmit and receive power and beamformers are also derived analytically. We then exploit the MIMO uplink-downlink duality to adapt our algorithm to compute a local optimal solution for channels with general rank.
AB - Designing fast algorithms that adapt the transmit and receive power and beamformers to optimize performance for different users is important in wireless MIMO downlink systems. This paper studies the max-min weighted SIR problem in the downlink, where multiple users are weighted according to priority and are subject to a total power constraint. The difficulty of this nonconvex problem is compounded by the coupling in the transmit and receive beamformers, thereby making it hard to optimize in a distributed fashion. We first show that this problem can be optimally and efficiently computed using a fast algorithm when the channels are rank-one. The optimal transmit and receive power and beamformers are also derived analytically. We then exploit the MIMO uplink-downlink duality to adapt our algorithm to compute a local optimal solution for channels with general rank.
UR - http://www.scopus.com/inward/record.url?scp=77955700149&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77955700149&partnerID=8YFLogxK
U2 - 10.1109/ISIT.2010.5513412
DO - 10.1109/ISIT.2010.5513412
M3 - Conference contribution
AN - SCOPUS:77955700149
SN - 9781424469604
T3 - IEEE International Symposium on Information Theory - Proceedings
SP - 2118
EP - 2122
BT - 2010 IEEE International Symposium on Information Theory, ISIT 2010 - Proceedings
Y2 - 13 June 2010 through 18 June 2010
ER -