## Abstract

In this work, we study a MIMO system with MMSE receiver in a flat-fading environment. We assume that the receiver has perfect CSI and the transmitter knows only the mean channel matrix either by feedback or channel estimation. First, we derive the properties of the average normalized MSE and its dependence on the singular values of the mean component. Next, we show that the optimal transmit strategy is to transmit into direction of the eigenvectors of the squared mean component. In addition to this, we characterize the optimal power allocation using the necessary and sufficient optimality conditions. Furthermore, the optimal strategy for small SNR values is to perform beamforming, i.e. to transmit only in direction of the largest mean matrix eigenvalue.

Original language | English |
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Pages (from-to) | 3787-3791 |

Number of pages | 5 |

Journal | IEEE Vehicular Technology Conference |

Volume | 60 |

Issue number | 5 |

State | Published - 2004 |

Externally published | Yes |

Event | 2004 IEEE 60th Vehicular Technology Conference, VTC2004-Fall: Wireless Technologies for Global Security - Los Angeles, CA, United States Duration: 26 Sep 2004 → 29 Sep 2004 |