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

2. Measurement Environment (1/2)
March doc.:IEEE /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

3. Measurement Environment (2/2)
March doc.:IEEE /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

4. ETRI Channel Sounder (BECS)
March doc.:IEEE /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

5. Measurement Result: Delay Spread
March doc.:IEEE /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

6. Measurement Result: Antenna Correlation
March doc.:IEEE /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

7. Channel Capacity Capacity calculation method is used in stead of
March doc.:IEEE /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

8. Measurement Result: Capacity (1/2)
March doc.:IEEE /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

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

10. March doc.:IEEE /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

11. March doc.:IEEE /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

12. March doc.:IEEE /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