Submission Byung-Jae Kwak et al., ETRISlide 1 May 2009 doc.:IEEE 802.11-09/0543r0 Measured Channel Capacity and AoD Estimation for Multi-User MIMO Scenarios.

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Presentation transcript:

Submission Byung-Jae Kwak et al., ETRISlide 1 May 2009 doc.:IEEE /0543r0 Measured Channel Capacity and AoD Estimation for Multi-User MIMO Scenarios

Submission Byung-Jae Kwak et al., ETRI Introduction During the TGac channel model addendum document discussion in Vancouver meeting, there was interest in studying the AoD spectrum variation as a function of client location and orientation. This presentation describes measurement results performed at ETRI to address the following issues: Sensitivity of SDMA channel capacity to Transmit and Receive antenna orientation. Variation of SDMA DL AoD spectrum as a function of client location. May 2009 doc.:IEEE /0543r0 Slide 2

Submission Byung-Jae Kwak et al., ETRI Measurement Scenario 1 Tx AP (8 antennas) and 6 Rx STAs (2 antennas each) Antenna Configurations Uniform Linear Antenna: 8x2 Tx Ant Orientation: -30 o ~ +30 o in 10 o steps Rx Ant Orientation: -180 o ~ +180 o in 30 o steps Measurement Site Office environment 1 st floor, bldg. #7, ETRI 3 LOS, 3 NLOS May 2009 doc.:IEEE /0543r0 Slide 3

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 4 Floor Map of the Measurement Site Tx Rx 13m partition desks concrete wall concrete pillar steel wall Concrete wall steel partition 13m 18m 15m 11m 8m (LoS) (NLoS) Tx ant orientation: -30 o ~30 o in 10 o steps Rx ant orientation: -180 o ~180 o in 30 o steps

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 5 The Measurement Site Tx antenna height = 2m Rx antenna height = 90cm Tx Rx LOS Tx Non-LOS Tx Ant System

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 6 Sensitivity to Antenna Orientation (NLOS) Tx ant orientation: -30  ~ +30  Rx fixed at case 1 Rx ant orientation: -180  ~ 180  Rx fixed at case 1 Capacity is calculated by using MMSE post-SINR 4 STAs: STA #3 (NLOS), #4 (LOS), #5 (NLOS), #6 (NLOS) Tx ant orientation: -30  ~ +30  in 10  steps (case1 ~ case7) Rx ant orientation: -180  ~ +180  in 30  steps (case1 ~ caseC)

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 7 Sensitivity to Antenna Orientation (LOS) Tx ant orientation: -30  ~ +30  Rx fixed at case 1 Rx ant orientation: -180  ~ 180  Tx fixed at case 1 Capacity is calculated by using MMSE post-SINR 4 STAs: STA #1 (LOS), #2 (LOS), #3 (NLOS), #4 (LOS) Tx ant orientation: -30  ~ +30  in 10  steps (case1 ~ case7) Rx ant orientation: -180  ~ +180  in 30  steps (case1 ~ caseC)

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 8 Sensitivity to Antenna Orientation: Conclusions SDMA channel capacity is sensitive to the Tx and Rx antenna orientations Capacity is more sensitive to the orientation of the Tx antenna array than that of the individual Rx client arrays. For example, NLOS: 32 ±3 bps/Hz when Tx ant. orientation changed (Δθ = 60 o ) 31 ±2 bps/Hz when Rx ant. orientation changed (Δθ = 360 o ) Note: The absolute values of the capacities are not relevant. We should be focused on the trend/pattern, etc The above result indicates that TGac MU-MIMO channel models need to incorporate AoD variation across clients, to be realistic.

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 9 AoD Estimation from Linear Array Measurements The AoD spectrum is estimated from linear array measurements by the following method: Assume: Antenna array length = N Antenna separation (relative to wavelength) = (d/λ) Phase vector A(θ) = [1 e j2π(d/λ)sinθ e j4π(d/λ)sinθ …… e j(N-1)2π(d/λ)sinθ ] where θ = AoD Received channel vector for the j-th time-domain tap = h j The AoD spectrum is obtained by plotting 20log 10 (|| h j A(θ)||) vs. θ. For the purposes of this presentation, the AoD has been averaged across all time-domain taps.

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 10 Tx antenna orientation: case 7 Rx antenna orientation: case 1 User 1User 2 AoD Spectrum at Each STA (1/3)

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 11 AoD Spectrum at Each STA (2/3) Tx antenna orientation: case 7 Rx antenna orientation: case 1 User 3User 4

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 12 Tx antenna orientation: case 7 Rx antenna orientation: case 1 AoD Spectrum at Each STA (3/3) User 5User 6

Submission Byung-Jae Kwak et al., ETRI May 2009 doc.:IEEE /0543r0 Slide 13 Variation of AoD spectrum: Conclusions Measurements suggest considerable AoD variation across clients. Note: AoD range of approx ±30 o was suggested for NLOS clusters in the TGac channel model addendum document. Further analysis and measurements are underway to characterise AoD variation, on a cluster-by-cluster basis. We recommend that the TGac channel model addendum document use a “TBD” value for AoD range, until the analysis is completed.