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http://dx.doi.org/10.7840/KICS.2011.36C.12.764

Simplified Near Optimal Downlink Beamforming Schemes in Multi-Cell Environment  

Yang, Jang-Hoon (한독미디어대학원대학교 뉴미디어학부)
Kim, Dong-Ku (연세대학교 전기전자공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.36, no.12C, 2011 , pp. 764-773 More about this Journal
Abstract
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.
Keywords
MIMO; multi-cell; beamforming; duality; MISO; sum rate maximization;
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