[Intra-cluster response model and parameter for the enterprise cubicle environments at 60GHz]

1. [Intra-cluster response model and parameter for the enterprise cubicle environments at 60GHz] Date: 2010-3-17 Authors: Hirokazu Sawada, Tohoku University

2. Abstract • This paper gives intra-cluster channel models for cubicle environments defined by TGad • Two intra-cluster channel models for STA locations, NEAR and FAR in cubicle environments are developed (Vertical polarization with 30 degree HPBW antenna for STA and circular polarization with 90 degree HPBW antenna for AP) • Major difference between near and far location channel model is decay factor • Maximum delay spread of 2.2ns is observed when STA is under the AP • The intra-cluster channel models proposed in this paper will be integrated with the inter-cluster channel models given by doc. 09/334r7 by Alexander Hirokazu Sawada, Tohoku University

3. Current status of TGad channel modeling • TGad channel modeling will be completed with this work Hirokazu Sawada, Tohoku University

4. Measurement system for cubicle environments Tx antenna is near the ceiling(AP) Network Analyzer Rx antenna is on the desktop(STA) • Instrument: Vector network analyzer Hirokazu Sawada, Tohoku University

5. Measurement set up Hirokazu Sawada, Tohoku University

6. Floor plan of cubicle environments Near location Far location AP height:2.5m STA height:0.7m from floor Impulse responses are measured at the left, center, right positions on desktop STA STA Desk 160×70 Hirokazu Sawada, Tohoku University

7. Circular polarization is adopted for AP antenna AP antenna AP antenna C Pol. C Pol. E Rotation E • Vertical polarization is adopted for STA • (“Polarization mismatch”: avoided by this – Linear TX antenna to linear RX antenna may cause much larger mismatch by PC /STA rotation) Hirokazu Sawada, Tohoku University

8. Measurement snapshots Tx Rx AP-STA Link Inside of a cubicle Rx antenna direction is aligned to Tx antenna direction in the measurement Hirokazu Sawada, Tohoku University

9. Direct and reflection wave paths in cubicle environments Tx Direct wave Reflection wave Near location Far location Left Center Right Rx position Left Center Right Rx position • Rx positions: three on desktop (left, center, right) for each • Direct wave attenuated by partition in far location (3-4 dB) • Multiple-time-reflected waves on desktop Hirokazu Sawada, Tohoku University

10. Impulse responses of AP-STA(AP antenna HPBW:90deg, C pol., STA antenna HPBW:30deg, V pol.) Reflection waves Rapid decay Reflection waves Slow decay Direct wave Direct wave Far location scenario Near location scenario • Direct wave and reflection waves creating a single cluster were observed in the both scenarios Hirokazu Sawada, Tohoku University

11. Delay spread for each scenario • Largest delay spread of maximum 2.2ns: observed when STA is under the AP Hirokazu Sawada, Tohoku University

12. Intra-cluster parameters for cubicle environments • The major difference: decay factor Central ray of intra-cluster kf kb Rayleigh distribution Rayleigh distribution • Tx antenna (AP) • HPBW: 90deg • C pol. • Rx antenna (STA) • HPBW: 30deg • V pol. Ray decay factor, gf Ray decay factor, gb t = 0 Time of arrival Arrival rate, lb Arrival rate, lf Hirokazu Sawada, Tohoku University

13. Conclusion • Two intra-cluster channel models for enterprise cubicle environments for Near and Far Locations have been proposed (Circular polarization with 90 degree HPBW antenna for AP and vertical polarization with 30 degree HPBW antenna for STA ) • Major difference between near and far location is decay factor • Ready to merge with inter-cluster channel models Hirokazu Sawada, Tohoku University