Title :
Linear Precoder and Equalizer Design for Uplink Multiuser MIMO Systems with Imperfect Channel State Information
Author :
Huang, Jane W. ; Au, Edward K S ; Lau, Vincent K N
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Clear Water Bay
Abstract :
This paper considers a joint design of linear precoders and equalizers for uplink multiuser multiple-input multiple-output communications systems over uncorrelated flat-fading channels with imperfect channel state information at both the transmitters and the receivers. By minimizing the mean square error (MSE) of all users, or equivalently the sum-MSE, under a sum-power constraint, we model the linear transceiver design as an optimization problem. Instead of relying on complex iterative algorithms, the authors propose a low-complexity, non-iterative but close-to-optimal precoder design solution by relaxing the problem into a simpler convex optimization problem. In this way, a closed-form linear transceiver structure can be derived by using the Karush-Kuhn-Tucker (KKT) optimality conditions. Based on the closed-form solution and random matrix theory, the authors obtain a simple asymptotic expression on the average sum-MSE, which can provide useful design insights.
Keywords :
MIMO communication; MIMO systems; fading channels; mean square error methods; transceivers; MIMO systems; closed-form solution; complex iterative; equalizer design; flat-fading channels; imperfect channel state information; linear precoder; linear transceiver design; mean square error; multiple-input multiple-output communication; random matrix; receivers; transmitters; Channel state information; Communication systems; Constraint optimization; Design optimization; Equalizers; Iterative algorithms; MIMO; Mean square error methods; Transceivers; Transmitters;
Conference_Titel :
Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE
Conference_Location :
Kowloon
Print_ISBN :
1-4244-0658-7
Electronic_ISBN :
1525-3511
DOI :
10.1109/WCNC.2007.245