TY - GEN
T1 - A practical approach for weighted rate sum maximization in MIMO-OFDM broadcast channels
AU - Kobayashi, Mari
AU - Caire, Giuseppe
PY - 2007
Y1 - 2007
N2 - We study the maximization of weighted sum rate in multi-input multi-output OFDM broadcast channels based on MMSE linear beamforming. The problem at hand is a wellknown non-convex problem. Nevertheless, motivated by Yu's "zero duality gap" result in a multicarrier system, we apply dual decomposition to reduce the original problem to N independent subproblems where N denotes the number of subcarriers. For each subproblem, we propose a simple waterfilling approach that aims at iteratively solving the KKT condition. Numerical examples show that the proposed algorithm achieves near-optimal performance under a typical downlink scenario.
AB - We study the maximization of weighted sum rate in multi-input multi-output OFDM broadcast channels based on MMSE linear beamforming. The problem at hand is a wellknown non-convex problem. Nevertheless, motivated by Yu's "zero duality gap" result in a multicarrier system, we apply dual decomposition to reduce the original problem to N independent subproblems where N denotes the number of subcarriers. For each subproblem, we propose a simple waterfilling approach that aims at iteratively solving the KKT condition. Numerical examples show that the proposed algorithm achieves near-optimal performance under a typical downlink scenario.
UR - http://www.scopus.com/inward/record.url?scp=50249183996&partnerID=8YFLogxK
U2 - 10.1109/ACSSC.2007.4487499
DO - 10.1109/ACSSC.2007.4487499
M3 - Conference contribution
AN - SCOPUS:50249183996
SN - 9781424421107
T3 - Conference Record - Asilomar Conference on Signals, Systems and Computers
SP - 1591
EP - 1595
BT - Conference Record of the 41st Asilomar Conference on Signals, Systems and Computers, ACSSC
T2 - 41st Asilomar Conference on Signals, Systems and Computers, ACSSC
Y2 - 4 November 2007 through 7 November 2007
ER -