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Optimal Design of Nonuniform Linear Arrays in Cellular Systems by Out-of-Cell Interference Minimization

EURASIP Journal on Wireless Communications and Networking volume 2007, Article number: 093421 (2007) Cite this article

Abstract

Optimal design of a linear antenna array with nonuniform interelement spacings is investigated for the uplink of a cellular system. The optimization criterion considered is based on the minimization of the average interference power at the output of a conventional beamformer (matched filter) and it is compared to the maximization of the ergodic capacity (throughput). Out-of-cell interference is modelled as spatially correlated Gaussian noise. The more analytically tractable problem of minimizing the interference power is considered first, and a closed-form expression for this criterion is derived as a function of the antenna spacings. This analysis allows to get insight into the structure of the optimal array for different propagation conditions and cellular layouts. The optimal array deployments obtained according to this criterion are then shown, via numerical optimization, to maximize the ergodic capacity for the scenarios considered here. More importantly, it is verified that substantial performance gain with respect to conventionally designed linear antenna arrays (i.e., uniform interelement spacing) can be harnessed by a nonuniform optimized linear array.

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Authors and Affiliations

  1. Dipartimento di Elettronica e Informazione, Politecnico di Milano, Milano, 20133, Italy

    S. Savazzi & U. Spagnolini

  2. Center for Wireless Communications and Signal Processing Research (CCSPR), New Jersey Institute of Technology, University Heights, Newark, NJ, 07102-1982, USA

    O. Simeone

Authors
  1. S. Savazzi
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  2. O. Simeone
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  3. U. Spagnolini
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Correspondence to S. Savazzi.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Savazzi, S., Simeone, O. & Spagnolini, U. Optimal Design of Nonuniform Linear Arrays in Cellular Systems by Out-of-Cell Interference Minimization. J Wireless Com Network 2007, 093421 (2007). https://doi.org/10.1155/2007/93421

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  • DOI: https://doi.org/10.1155/2007/93421

Keywords

  • Optimization Criterion
  • Linear Array
  • Cellular System
  • Matched Filter
  • Interference Power