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Analysis of CDMA MIMO Beamforming Multicell Deployment Scenarios using Effective Radiation Patterns

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Abstract

This paper presents approximate formulas for the signal to interference ratio (SIR) gain and the corresponding bit error rate (BER) performance, when the simple concept of an effective radiation pattern of the produced ‘real world’ Multiple-Input-Multiple-Output (MIMO) beamforming radiation pattern, is considered for CDMA multi-cell/tier deployments. These simple and practical formulas can be easily used to produce initial results for a range of effective values corresponding to different operational scenarios, and hence, provide a fast and straightforward approach to evaluate performance aspects of MIMO beamforming multicell deployments. Results show that for macrocellular operational scenarios with \(10^{\circ }\) effective beamwidth and \(-\)10 dB effective average sidelobe level, 11 dB SIR gain and 3.5 orders of magnitude BER improvement (compared to the omnidirectional scenario) can be achieved with an aggressive (MIMO beamforming in all cells) deployment strategy.

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Notes

  1. Another similar simple interference model was presented in [9]. These models are known to be accurate for large numbers of uniformly distributed users and it was shown in [18] that they are equivalent for this kind of analysis.

  2. Note that the assumption made throughout this study that the radiation patterns in all cells have the same characteristics, is generally valid if realistic values are used for these characteristics.

  3. This is not the case for operational scenarios with multiple multipath clusters (e.g. bad urban)

  4. Note that for the examined ranges of BW and SLL the max directivity is \(\sim \)14 dB, hence, a linear array with up to 25 antenna elements would be required.

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Authors and Affiliations

  1. Department of Informatics and Telecommunications, University of Peloponnese, Tripolis, Greece

    G. V. Tsoulos & G. E. Athanasiadou

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  1. G. V. Tsoulos
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  2. G. E. Athanasiadou
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Correspondence to G. V. Tsoulos.

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Tsoulos, G.V., Athanasiadou, G.E. Analysis of CDMA MIMO Beamforming Multicell Deployment Scenarios using Effective Radiation Patterns. Wireless Pers Commun 75, 2269–2280 (2014). https://doi.org/10.1007/s11277-013-1466-4

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