Title :
Weighted sum-rate maximization using weighted MMSE for MIMO-BC beamforming design
Author :
Christensen, S?¸ren Skovgaard ; Agarwal, Rajiv ; Carvalho, Elyson ; Cioffi, John M.
Author_Institution :
Nokia Denmark, Modem Algorithm Design, Copenhagen
fDate :
12/1/2008 12:00:00 AM
Abstract :
This paper studies linear transmit filter design for Weighted Sum-Rate (WSR) maximization in the multiple input multiple output broadcast channel (MIMO-BC). The problem of finding the optimal transmit filter is non-convex and intractable to solve using low complexity methods. Motivated by recent results highlighting the relationship between mutual information and minimum mean square error (MMSE), this paper establishes a relationship between weighted sum-rate and weighted MMSE in the MIMO-BC. The relationship is used to propose two low complexity algorithms for finding a local weighted sum-rate optimum based on alternating optimization. Numerical results studying sum-rate show that the proposed algorithms achieve high performance with few iterations.
Keywords :
MIMO communication; array signal processing; broadcast channels; filtering theory; iterative methods; least mean squares methods; optimisation; MIMO-BC beamforming design; MMSE; iteration method; linear transmit filter design; minimum mean square error method; multiple input multiple output broadcast channel; optimization; weighted sum-rate maximization; Antennas and propagation; Array signal processing; Broadcasting; Downlink; Iterative algorithms; MIMO; Mean square error methods; Meteorological radar; Mutual information; Nonlinear filters; MIMO systems, transceiver design, smart antennas; antennas and propagation.;
Journal_Title :
Wireless Communications, IEEE Transactions on
Conference_Location :
12/1/2008 12:00:00 AM
DOI :
10.1109/T-WC.2008.070851