Optimal Power Allocation Scheme for Downlink CoMP Systems

Jun Li, Han Hai, Ying Guo, Moon Ho Lee

Department of Electronic and Information Engineering, Chonbuk National University, Jeonju, Korea.
School of Information Science & Engineering Central South University, Changsha, China.

DOI: 10.4236/cn.2013.52B003                

Abstract

Coordinated multi-point transmission and reception (CoMP) scheme enable LTE-Advanced systems to achieve their higher spectral efficiency. Allowing base stations to cooperate one another is one of the solutions to mitigate the inter-cell interference (ICI). In this paper, we propose an iterative power allocation scheme with MMSE procoding based on a modified water-filling for downlink CoMP systems, which achieves the optimal performance. The simulation results show that our proposed system can achieve its optimal rate according to its antenna configuration. Comparing them with a block diagonalization (BD) shows the advantages of MMSE precoding, in particular at a low SNR region.

Keywords

CoMP; Precoding; Power Allocation; Waterfilling

Conflicts of Interest

The authors declare no conflicts of interest.

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