Title :
Homotopy Algorithm for Energy-Efficient MIMO Systems with Joint Power Constraints
Author :
Jisheng Dai ; Xu Bao
Author_Institution :
Sch. of Electr. & Inf. Eng., Jiangsu Univ., Zhenjiang, China
Abstract :
This paper considers an energy efficiency (EE) optimization problem for multiple-input multiple-output (MIMO) systems, subject to a realistic power constraint jointly imposed on both sum-power and maximum eigenvalue. Inspired by an existing Homotopy-type algorithm for the optimal precoder design of MIMO systems, we fully investigate the usefulness of the piecewise linear property between power allocations and sum-power, and then derive a piecewise-defined algorithm to obtain the maximum EE in a closed form. To the best of our knowledge, it is the first time to present such a closed-form solution for the EE optimization in MIMO systems.
Keywords :
MIMO communication; energy conservation; optimisation; precoding; telecommunication power management; EE optimization problem; energy efficiency optimization problem; energy-efficient MIMO systems; homotopy algorithm; joint power constraints; maximum eigenvalue; multiple-input multiple-output systems; optimal precoder design; piecewise linear property; piecewise-defined algorithm; power allocations; sum-power; Eigenvalues and eigenfunctions; Joints; MIMO; Optimization; Resource management; Transmitters; Wireless communication; Multiple-input multiple-output (MIMO); energy efficiency; homotopy method; piecewise linear method;
Journal_Title :
Wireless Communications Letters, IEEE
DOI :
10.1109/WCL.2013.112313.130749
