Networked MIMO with clustered linear precoding

  • Authors:

  • Jun Zhang;Runhua Chen;Jeffrey G. Andrews;Arunabha Ghosh;Robert W. Heath

  • Affiliations:

  • Department of Electrical and Computer Engineering, The University of Texas at Austin;DSPS R&D Center, Texas Instruments Incorporated, Dallas, TX;Department of Electrical and Computer Engineering, The University of Texas at Austin;AT&T Labs;Department of Electrical and Computer Engineering, The University of Texas at Austin

  • Venue:
  • IEEE Transactions on Wireless Communications
  • Year:
  • 2009

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Abstract

A clustered base transceiver station (BTS) coordination strategy is proposed for a large cellular MIMO network, which includes full intra-cluster coordination-to enhance the sum rate-and limited inter-cluster coordination-to reduce interference for the cluster edge users. Multi-cell block diagonalization is used to coordinate the transmissions across multiple BTSs in the same cluster. To satisfy per-BTS power constraints, three combined precoder and power allocation algorithms are proposed with different performance and complexity tradeoffs. For inter-cluster coordination, the coordination area is chosen to balance fairness for edge users and the achievable sum rate. It is shown that a small cluster size (about 7 cells) is sufficient to obtain most of the sum rate benefits from clustered coordination while greatly relieving channel feedback requirement. Simulations show that the proposed coordination strategy efficiently reduces interference and provides a considerable sum rate gain for cellular MIMO networks.