## Abstract

In this paper, we study the performance of the Regularized Channel Inversion (RCI) precoder in a multi-user MIMO system with malicious users. We consider the general case when the number of users per transmit antenna β can take any value. We derive the optimal regularization parameter that maximizes the achievable secrecy sum-rate via large-system analysis, which we show to be accurate via simulations. We find that the secrecy requirements limit the number of users per transmit antenna that can be served with non-zero sum-rate. We show that for large signal-to-noise ratio, RCI can achieve secrecy without reducing the sum-rate if β < 1. If β = 1, this is still possible at a cost of less than 4dB in terms of transmitted power. If β > 1, then the secrecy requirements result in a poor sum-rate.

Original language | English |
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Title of host publication | 2012 IEEE Wireless Communications and Networking Conference (WCNC) |

Place of Publication | Piscataway, NJ |

Publisher | Institute of Electrical and Electronics Engineers (IEEE) |

Pages | 533-537 |

Number of pages | 5 |

ISBN (Electronic) | 9781467304375 |

ISBN (Print) | 9781467304368 |

DOIs | |

Publication status | Published - 2012 |

Externally published | Yes |

Event | 2012 IEEE Wireless Communications and Networking Conference, WCNC 2012 - Paris, France Duration: 1 Apr 2012 → 4 Apr 2012 |

### Other

Other | 2012 IEEE Wireless Communications and Networking Conference, WCNC 2012 |
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Country/Territory | France |

City | Paris |

Period | 1/04/12 → 4/04/12 |