System Level Modeling and Optimization of the LTE Downlink

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4. Extensions to the L2S ModelIn the next scenario, a simple hexagonal deployment of eNodeBs with omnidirectionalantennas has been employed. Although not representing a more complextri-sector cell layout such as in [69], it still validates whether the SINR model iscapable of predicting the average achievable capacity in an interference-limited scenario.The simulation parameters used in this simulation set are listed in Table 4.4.As SINR averaging is handled by the link performance model, simulation results fora single-carrier setup are sufficient and reduce simulation time.Figure 4.9 depicts for the simulated area the wideband, denoted as SINR Γ(x, y),and resulting from the simulation parameters listed in Table 4.4. For each point(x, y) of the ROI, the wideband SINR corresponding to the closest cell SINR-wise,denoted as the i-th cell, is depicted.y pos [m]500400363002001000 257−100−200−300−40014−500−600 −400 −200 0 200 400 600x pos [m]4035302520151050Considered simulation area: center cellFigure 4.9: Network layout used for the multi-cell simulation. The center highlighted areashows the points taken into account for the simulation.Figure 4.10 show the results of the accuracy of the model for the 2×2 and 4×4antenna configuration cases, respectively.F(x)10.90.80.70.60.50.40.30.20.11 layer2 layers00 5 10 15Achievable capacity [bit/s/cu]F(x)10.90.80.70.60.50.40.30.21 layer2 layers0.13 layers4 layers00 5 10 15 20Achievable capacity [bit/s/cu]Figure 4.10: Achievable capacity results for the 2 × 2 (left) and 4 × 4 (right) antenna configurations.Solid line: modeled achievable capacity. Dashed line: calculatedachievable capacity.62
4. Extensions to the L2S ModelIn this case, and as opposed to the results in Figure 4.8, σ 2 e is is also influenced bythe interfering cells, such that σe 2 = ce σn 2 + ∑ N inti=1 σ2 x i). Thus, more realisticallymodeling the distribution of σe 2 to that of a cellular network layout.σ 2 x 0(The results depicted on Figure 4.10 show the ecdf of the achievable rate empiricalover the cell area depicted in Figure 4.9. Results are shown for the 2×2 (left)and 4×4 (right) antenna configurations and for each case for all of the layer (RI)possibilities.Since the model is based on a Taylor approximation at E = 0, it is expected tobe less accurate the higher σe 2 is, as visible in Figure 4.10, where, specially for thefour-layer 4×4 case, the model is pessimistic compared to the expected result dueto the application of the Taylor approximation, although still retaining a good levelof accuracy.63
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DissertationSystem Level Modeling a
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I hereby certify that the work repo
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KurzfassungDie vorliegende Arbeit p
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ContentsContents1 Motivation and Sc
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Contentsix
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1. Motivation and Scope of Work1. M
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1. Motivation and Scope of Worklaye
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1. Motivation and Scope of Workperf
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BibliographyThe combined throughput
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2. 3GPP Long Term Evolution2. 3GPP
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Page 109 and 110: C. Taylor Expansion of the ZF MSEC.
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Abbreviations and Acronymsfemto cel
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