### Abstract

This paper analyzes the pilot power ratio (PPR) in multiuser multiple-input multiple-output (MU-MIMO) systems with a large number of receive antennas (M) at the base station (BS). We consider zero-forcing based MU-MIMO orthogonal frequency division multiplexing (OFDM) systems. Based on the deterministic uplink sum-rate approximation for imperfect channel state information, we can formulate the optimization problems in terms of the PPR to maximize the ergodic uplink sum-rate subject to the per-slot or per-symbol power constraint. Under the per-slot power constraint, the optimal PPR can be obtained in a closed form while under the per-symbol power constraint, we propose an iterative algorithm which generates a suboptimal PPR. Simulation results show that the proposed PPRs perform close to the optimal performance in terms of the sum-rate. Also, it is shown that the proposed PPRs outperform the equal power allocation. In particular, in the ZF-R based MU-MIMO OFDM system with 8 users and M = 32 under the per-slot power constraint, the proposed PPR can achieve about 8bps/Hz performance gain compared to the equal power allocation.

Original language | English |
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Title of host publication | 2013 IEEE 78th Vehicular Technology Conference, VTC Fall 2013 |

DOIs | |

Publication status | Published - 2013 Dec 1 |

Event | 2013 IEEE 78th Vehicular Technology Conference, VTC Fall 2013 - Las Vegas, NV, United States Duration: 2013 Sep 2 → 2013 Sep 5 |

### Publication series

Name | IEEE Vehicular Technology Conference |
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ISSN (Print) | 1550-2252 |

### Other

Other | 2013 IEEE 78th Vehicular Technology Conference, VTC Fall 2013 |
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Country | United States |

City | Las Vegas, NV |

Period | 13/9/2 → 13/9/5 |

### All Science Journal Classification (ASJC) codes

- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics

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## Cite this

*2013 IEEE 78th Vehicular Technology Conference, VTC Fall 2013*[6692364] (IEEE Vehicular Technology Conference). https://doi.org/10.1109/VTCFall.2013.6692364