Indoor Channel Measurements for TGac Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2009 doc.:IEEE 802.11-09/0345r0 Indoor Channel Measurements for TGac Minho Cheong, ETRI John Doe, Some Company

Measurement Environment (1/2) March 2009 doc.:IEEE 802.11-09/0345r0 Measurement Environment (1/2) Indoor 8x8(ULA) MIMO 100MHz channel at 5.25GHz A mixed measurement of LOS(6,7,8,9) and NLOS(the others) Used the channel sounder system developed by ETRI 6 7 8 9 2 1 3 4 5 a b c Tx Rx 10m partition steel wall desks concrete wall Minho Cheong, ETRI 2

Measurement Environment (2/2) March 2009 doc.:IEEE 802.11-09/0345r0 Measurement Environment (2/2) Tx antenna height is 2m, Rx antenna height is 1m Two independent channel measurements at each location (Rx is rotated 90) Tx Tx Rx Rx Parallel to Tx antenna Perpendicular to Tx antenna (end-fire case may occur) Minho Cheong, ETRI 3

ETRI Channel Sounder (BECS) March 2009 doc.:IEEE 802.11-09/0345r0 ETRI Channel Sounder (BECS) BECS System Hardware BBU (Baseband Unit) HPAU (High Power Amplifier Unit) RFFU (RF Front-end Unit) TRXU (Transceiver Unit) PSU (Power Supply) TIMU (Timing Unit) Minho Cheong, ETRI 4

Measurement Result: Delay Spread March 2009 doc.:IEEE 802.11-09/0345r0 Measurement Result: Delay Spread NLOS locations: about 80nsec rms delay spread TGn D-NLOS: 50nsec rms delay spread TGn E-NLOS: 100nsec rms delay spread Minho Cheong, ETRI 5

Measurement Result: Antenna Correlation March 2009 doc.:IEEE 802.11-09/0345r0 Measurement Result: Antenna Correlation Using 8-element uniform linear isotropic antenna array (/2 spacing) at Tx and Rx In case of max. antenna separation (3.5) LOS locations: 0.4 ~ 0.6 and NLOS locations: about 0.3 Minho Cheong, ETRI 6

Channel Capacity Capacity calculation method is used in stead of March 2009 doc.:IEEE 802.11-09/0345r0 Capacity calculation method Narrowband channel capacity Method 1 Normalization Factor is used in stead of Wideband channel capacity Average SNR( ) of 24dB is assumed where is the is channel frequency responses, is narrowband frequency bin, is the identity matrix, denotes the average SNR, and represents Hermitian transpose. Minho Cheong, ETRI 7

Measurement Result: Capacity (1/2) March 2009 doc.:IEEE 802.11-09/0345r0 Measurement Result: Capacity (1/2) Measurement results show the capacity CDF in NLOS locations where it is bounded between TGn channel models D & E (over the 50% CDF) Minho Cheong, ETRI 8

Measurement Result: Capacity (2/2) March 2009 doc.:IEEE 802.11-09/0345r0 Measurement Result: Capacity (2/2) LOS measurements vs. TGn LOS Capacity revisited from previous page with B-LOS added Minho Cheong, ETRI 9

March 2009 doc.:IEEE 802.11-09/0345r0 Concluding Remarks (1) The parameters of TGn channel models seems reasonable enough to cover the 8x8 measurement results in NLOS indoor office environment. In our measurements in LOS, there is a lot of capacity degradation, which is due to waveguide/long tunnel effect by the corridor and end-fire orientation of STA Then our measurement results don’t correspond with the TGn channel model (D & E) LOS The LOS measurement result except but end-fire case has more similar CDF to TGn channel model B-LOS (with smaller AS) than to D and E. Minho Cheong, ETRI 10

March 2009 doc.:IEEE 802.11-09/0345r0 Concluding Remarks (2) In end-fire case, the capacity can go down to almost half the capacity of i.i.d. channel. In order to support reasonable performance also in LOS conditions, it may need to use dual-polarized antennas for 8x8 MIMO. Other Observed Results In LOS, capacity calculated by simulation using TGn channel D > E > B Random case applied to angular domain AoD: between +/- 30 degree, AoA: between +/- 180 degree E > D > B Conventional AoD/AoA value picked for D-LOS may be optimal. Minho Cheong, ETRI 11

March 2009 doc.:IEEE 802.11-09/0345r0 Future Work For verifying the applicability of SDMA, we will perform additional measurement campaign in several environments. Measurements with the use of dual-polarized antennas for 8x8 MIMO. Measurements and analysis of the parameters of AoD and AoA affecting the SDMA performance. Minho Cheong, ETRI 12