### Abstract

This paper examines effects of deploying increasing numbers of antennas in fixed physical space. We focus on the resulting performance of large-scale multiple input multiple output (MIMO) transmitters using low complexity closed form precoding techniques. Towards this end, we explore the effects of adding antenna elements in fixed physical spaces, by reducing the antenna spacing. In particular, we investigate the combined effect of reducing the distance between the antenna elements with increasing the number of elements in a fixed transmitter space. This gives rise to two contradicting phenomena: the reduction of spatial diversity due to reducing the separation between antennas and the increase in transmit diversity by increasing the number of elements. To quantify this tradeoff, we investigate densely deployed uniform linear antenna arrays modeled in the CST Microwave Studio. The simulations show the somewhat surprising result that, by reducing the separations between the antennas to significantly less than the transmit wavelength to fit more antennas, improved performance is obtained.

Original language | English |
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Title of host publication | 2013 Future Network and Mobile Summit |

Publisher | IEEE |

ISBN (Print) | 9781905824373 |

Publication status | Published - 17 Oct 2013 |

Event | 2013 Future Network and Mobile Summit - Lisbon, Portugal Duration: 3 Jul 2013 → 5 Jul 2013 |

### Conference

Conference | 2013 Future Network and Mobile Summit |
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Country | Portugal |

City | Lisbon |

Period | 3/07/13 → 5/07/13 |

### Fingerprint

### Keywords

- Massive-MIMO
- Mutual coupling
- Precoding
- Transmit correlation

### ASJC Scopus subject areas

- Computer Networks and Communications

### Cite this

*2013 Future Network and Mobile Summit*[6633535] IEEE.

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*2013 Future Network and Mobile Summit.*, 6633535, IEEE, 2013 Future Network and Mobile Summit, Lisbon, Portugal, 3/07/13.

**Towards massive-MIMO transmitters : On the effects of deploying increasing antennas in fixed physical space.** / Masouros, Christos; Chen, Jianling; Tong, Kenneth; Sellathurai, Mathini; Ratnarajah, Tharm.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Towards massive-MIMO transmitters

T2 - On the effects of deploying increasing antennas in fixed physical space

AU - Masouros, Christos

AU - Chen, Jianling

AU - Tong, Kenneth

AU - Sellathurai, Mathini

AU - Ratnarajah, Tharm

PY - 2013/10/17

Y1 - 2013/10/17

N2 - This paper examines effects of deploying increasing numbers of antennas in fixed physical space. We focus on the resulting performance of large-scale multiple input multiple output (MIMO) transmitters using low complexity closed form precoding techniques. Towards this end, we explore the effects of adding antenna elements in fixed physical spaces, by reducing the antenna spacing. In particular, we investigate the combined effect of reducing the distance between the antenna elements with increasing the number of elements in a fixed transmitter space. This gives rise to two contradicting phenomena: the reduction of spatial diversity due to reducing the separation between antennas and the increase in transmit diversity by increasing the number of elements. To quantify this tradeoff, we investigate densely deployed uniform linear antenna arrays modeled in the CST Microwave Studio. The simulations show the somewhat surprising result that, by reducing the separations between the antennas to significantly less than the transmit wavelength to fit more antennas, improved performance is obtained.

AB - This paper examines effects of deploying increasing numbers of antennas in fixed physical space. We focus on the resulting performance of large-scale multiple input multiple output (MIMO) transmitters using low complexity closed form precoding techniques. Towards this end, we explore the effects of adding antenna elements in fixed physical spaces, by reducing the antenna spacing. In particular, we investigate the combined effect of reducing the distance between the antenna elements with increasing the number of elements in a fixed transmitter space. This gives rise to two contradicting phenomena: the reduction of spatial diversity due to reducing the separation between antennas and the increase in transmit diversity by increasing the number of elements. To quantify this tradeoff, we investigate densely deployed uniform linear antenna arrays modeled in the CST Microwave Studio. The simulations show the somewhat surprising result that, by reducing the separations between the antennas to significantly less than the transmit wavelength to fit more antennas, improved performance is obtained.

KW - Massive-MIMO

KW - Mutual coupling

KW - Precoding

KW - Transmit correlation

UR - http://www.scopus.com/inward/record.url?scp=84890101447&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84890101447

SN - 9781905824373

BT - 2013 Future Network and Mobile Summit

PB - IEEE

ER -