High SNR Analysis for MIMO Broadcast Channels: Dirty Paper Coding Versus Linear Precoding

In this correspondence, we compare the achievable throughput for the optimal strategy of dirty paper coding (DPC) to that achieved with suboptimal and lower complexity linear precoding techniques (zero-forcing and block diagonalization). Both strategies utilize all available spatial dimensions and therefore have the same multiplexing gain, but an absolute difference in terms of throughput does exist. The sum rate difference between the two strategies is analytically computed at asymptotically high SNR. Furthermore, the difference is not affected by asymmetric channel behavior when each user has a different average SNR. Weighted sum rate maximization is also considered. In the process, it is shown that allocating user powers in direct proportion to user weights asymptotically maximizes weighted sum rate.

• Publication year

  2006

• Venue

  IEEE Transactions on Information Theory

• Publication date

  2006-11-30

• Fields of study

  Mathematics, Computer Science, Engineering

• Identifiers
  DOI 10.1109/ISIT.2005.1523760arXiv cs/0612007
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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