Abstract
This letter proposes a distributed beamforming scheme based on block diagonalization (BD) for multicell multiuser multiple-input multiple-output (MU-MIMO) downlink systems. Although conventional BD can be directly extended to these systems in a distributed manner, it suffers from sum-rate degradation due to strict zero-forcing (ZF) constraints. To overcome this problem, we introduce a sum-rate maximization problem for BD, to find the optimal selection of ZF constraints. Then we propose a search algorithm to solve the problem in a distributed and heuristic manner. Simulation results show that the proposed scheme effectively finds a near-optimal solution and significantly improves simple extended BD such that it can provide higher sum rate than the conventional schemes.
Original language | English |
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Article number | 6766216 |
Pages (from-to) | 605-609 |
Number of pages | 5 |
Journal | IEEE Signal Processing Letters |
Volume | 21 |
Issue number | 5 |
DOIs | |
State | Published - May 2014 |
Keywords
- Coordinated beamforming
- Distributed beamforming
- Inter-cell interference