A Fast Low Complexity Method for Optimal Zero-Forcing Beamformer MU-MIMO System

作者：Dam Hai Huyen^*; Cantoni Antonio; Li Bin

来源：IEEE Signal Processing Letters, 2015, 22(9): 1443-1447.

DOI：10.1109/LSP.2015.2407903

• Accelerated gradient method
• beamformer
• MU-MIMO
• optimal step size
• optimum zero-forcing
• per-antenna power constraints

This letter proposes a new algorithm for solving the optimal zero-forcing beamforming problem that maximizes the user achievable rate with restriction on the per-antenna element power constraints. An accelerated gradient method with step size search is proposed for solving the problem. For each iteration of the gradient approach, a quick one dimensional search is employed to obtain the step size. The advantage of the step-size search is that it is relatively fast and requires only a few calculations of the objective function. Design examples show that the proposed algorithm converges faster than the gradient approach and the accelerated gradient approach with a constant step size while achieving a low computational complexity.

• 出版日期2015-9