Computer Science – Information Theory
Scientific paper
2007-02-22
Computer Science
Information Theory
Submitted to IEEE Int. Symposium on Inf. Theory (ISIT) 2007
Scientific paper
The downlink of a multiple-input multiple output (MIMO) broadcast channel (BC) is considered, where each receiver is equipped with a single antenna and the transmitter performs nonlinear Dirty-Paper Coding (DPC). We present an efficient algorithm that finds the optimum transmit filters and power allocation as well as the optimum precoding order(s) possibly affording time-sharing between individual DPC orders. Subsequently necessary and sufficient conditions for the optimality of an arbitrary precoding order are derived. Based on these we propose a suboptimal algorithm showing excellent performance and having low complexity.
Michel Thomas
Wunder Gerhard
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