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Multi-Carrier and Spread Spectrum Systems: From OFDM and MC ...

Multi-Carrier and Spread Spectrum Systems: From OFDM and MC ...

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WiMAX 237Table 5-12 Downlink LTE spectrum efficiency per cell in ascenario with 500 m inter-site distance [4]<strong>Spectrum</strong> efficiency <strong>Spectrum</strong> efficiency(bit/s/Hz/cell) (relative to UTRA)Requirement 0.53 3–4 × UTRA2 × 2 SU-MIMO 1.69 3.2 × UTRA4 × 2 SU-MIMO 1.87 3.5 × UTRA4 × 4 SU-MIMO 2.67 5.0 × UTRATable 5-13 Downlink LTE spectrum efficiency per cell in ascenario with 1732 m inter-site distance [4]<strong>Spectrum</strong> efficiency <strong>Spectrum</strong> efficiency(bit/s/Hz/cell) (relative to UTRA)Requirement 0.52 3–4 × UTRA2 × 2 SU-MIMO 1.56 3.0 × UTRA4 × 2 SU-MIMO 1.85 3.6 × UTRA4 × 4 SU-MIMO 2.41 4.6 × UTRATable 5-14 Uplink LTE spectrum efficiency per cell in a scenariowith 500 m inter-site distance [4]<strong>Spectrum</strong> efficiency <strong>Spectrum</strong> efficiency(bit/s/Hz/cell) (relative to UTRA)Requirement 0.332 2–3 × UTRA1 × 2SIMO 0.735 2.2 × UTRA1 × 4SIMO 1.103 3.3 × UTRA2 × 2 SU-MIMO 0.776 2.3 × UTRAIt can be seen that the minimum requirements for LTE are fulfilled. The mobility of themobile user is 3 km/h.Table 5-14 <strong>and</strong> Table 5-15 present the spectrum efficiency per cell for the uplink fordifferent inter-site distances. The tables show that the minimum requirements for LTEare met.5.3 WiMAX5.3.1 ScopeThe World-Wide Interoperability for Microwave Access (WiMAX) forum was initiatedby a small number of companies in 2001 for promoting originally the IEEE 802.16

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