Journal of information and communication convergence engineering

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Performance Analysis of Coordinated Random Beamforming Technique in Multi-cell Environments

  • Lee, Jong-Min (KAIST Institute for Information Technology Convergence) ;
  • Jung, Bang-Chul (Dept. of Information and Communication Engineering and the Institute of Marine Industry, Collage of Marine Science, Gyeongsang National University)
  • Received : 2010.05.20
  • Accepted : 2010.06.13
  • Published : 2010.08.31
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Abstract

For multi-cell environments, coordinated random beamforming technique in multiuser MIMO(multiple-input multiple-output) broadcast channel is considered. In order to mitigate severe interference at receivers, the multi-cell environments might require complex transmitter and receiver design because the scheduler decision based on full channel state information (CSI) in one cell must be intertwined with decision made by other cells' CSI. With limited CSI, however, this paper considers a scheme of randomizing transmitters' beamforming but being coordinated with other cell transmitters. The transmitters in each cell share random beamforming patterns and schedule data transmission within coherent scheduling period. The corandomized beams allow the users to be selected with the highest SINRs even in multi-cell environments. We analyze the performance of the proposed scheme. And numerical results show that the scheme achieves better performance than the conventional random beamforming when applying to multi-cell environments.

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References

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