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Simplified Near Optimal Downlink Beamforming Schemes in Multi-Cell Environment
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 Title & Authors
Simplified Near Optimal Downlink Beamforming Schemes in Multi-Cell Environment
Yang, Jang-Hoon; Kim, Dong-Ku;
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Despite enormous performance gain with multi-antenna transmission in the single cell environment, its gain diminishes out in the multi-cell environment due to interference. It is also very hard to solve the efficient downlink beamforming with low complexity in multi-cell environment. First, this paper shows that the asymptotically sum rate optimal downlink beamformings at low and high SNR are maximum ratio transmit (MRT) and zero forcing (ZF) beamforming in the multi-cell system, respectively. Secondly, exploiting the asymptotically optimal downlink beamforming, we develop simple two types of near optimal downlink beamforming schemes having the form of minimum mean squared error (MMSE) beamforming obtained from the dual uplink problem. For each type, three different subclasses are also considered depending on the computational complexity. The simulation results show that the proposed near optimum algorithms provide the trade-off between the complexity and the performance.
MIMO;multi-cell;beamforming;duality;MISO;sum rate maximization;
 Cited by
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