MU-MIMO System Performance of 8TX codebook IEEE 802.16 Presentation Submission Template (Rev. 9)...

MU-MIMO System Performance of 8TX codebook

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

IEEE C802.16m-09/0803Date Submitted:

2009-04-27Source: Jiann-An Tsai jtsai@sta.samsung.com

Jerry Pi, zpi@sta.samsung.com Bruno Clerckx bruno.clerckx@samsung.comDavid Mazzarese d.mazzarese@samsung.com

Samsung Electronics

Venue:Re : TGm Call for Contributions for Session 61

Base Contribution:None

Purpose:To discuss in the revision of the 802.16m AWD

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Release:The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that

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1

Background

• In the contribution, we evaluate the MU-MIMO system-level performance of 8TX codebook systems under various mobile environments: Urban Macro, Suburban, Urban Micro

• MU-MIMO is evaluated using 4-bit rank-1 codebook• Impact of antenna spacing is also evaluted

2

ParameterAssumption

Cellular Layout Hexagonal grid, 19 cell sites, 3 sectors per site

Inter-site distance 500m

Distance-dependent path loss L=I + 37.6log10(.R), R in kilometersI=128.1 – 2GHz, I=120.9 - 900MHz [5]

Shadowing standard deviation 8 dB

Correlation distance of Shadowing 50 m

Penetration Loss 20dB

Antenna pattern [4] (horizontal)(For 3-sector cell sites with fixed antenna patterns)

= 70 degrees, Am = 20 dB

Carrier Frequency / Bandwidth 2GHz

Channel model Spatial Channel Model (SCM) simulations

UE speeds of interest 3km/h,

Total BS TX power (Ptotal) 46dBm - 10MHz carrier

Users dropped uniformly in entire cell

Minimum distance between UE and cell

>= 35 meters

Base Station Simulation Parameters

– Reference EUTRA UE parameters

ParametersModel Assumptions

Receiver 2 Antennas

Antenna gain 0 dBi

Noise Figure 9 dB

Mobile Station Simulation Parameters

5

System Simulation Parameters Parameters Assumptions

OFDM parameters 10 MHz (1024 subcarriers)

Permutation / Channelization Localized

Number of total RU in one subframe 48

Number of RU for PMI and CQI calculation 4

CQI, PMI feedback period Every 1 frame (5ms)

Full Sub-band feedback

CQI Based on dedicated pilot

PMI Based on common pilot/midamble

CQI, PMI feedback delay 1 frame (5ms)

MCS levels 16 MCS level-QPSK, QAM16, QAM64

MIMO receiver LMMSE

Channel SCM-Urban Micro

Data Channel Estimation Ideal channel estimation

HARQ Retransmission IR Combining, Maximum 4 re-transmissions.

Scheduling Proportional Fair

Summary-MU-MIMO

– System-level MU-MIMO simulation results show that the current AWD rank-1 codebook works well as compared propsoed codebook

– As shown, slight performance degradation is observed for larger antenna spacing, as expected.

6

7

Sector Throughput

4 5 6 7 8 9 10 11 124

4.5

5

5.5

6

6.5S

yste

m (

Sec

tor)

Thr

ough

put

(bps

/Hz)

# of mobile stations

AWD-0.5

Unitary -0.5

AWD-0.7

Unitary -0.7

SIMULATION RESULTS – 8TXMU-MIMO SYSTEM PERFORMANCE (SCM CHANNEL)-URBAN MICRO

8

9

Sector Throughput

SV-steering vector

4 5 6 7 8 9 10 11 123.8

4

4.2

4.4

4.6

4.8

5

5.2

5.4

5.6

5.8

Sys

tem

(S

ecto

r) T

hrou

ghpu

t (b

ps/H

z)

# of mobile stations

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

10

Cell edge Throughput

SV-steering vector

4 5 6 7 8 9 10 11 12

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

Cel

ledg

e T

hrou

ghpu

t (b

ps/H

z)

# of mobile stations

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

11

CDF of User Throughput –Light load (4 mobile stations)

SV-steering vector

0 0.5 1 1.5 2 2.5 3 3.50

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

User Throughput (bps/Hz)

CD

F

# of mobile stations =4

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

12

CDF of User Throughput –Heavy load (12 mobile stations)

SV-steering vector

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

User Throughput (bps/Hz)

CD

F# of mobile stations =12

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

SIMULATION RESULTS – 8TXMU-MIMO SYSTEM PERFORMANCE (SCM CHANNEL)-SUBURBAN

13

14

Sector Throughput

SV-steering vector

4 5 6 7 8 9 10 11 124.5

5

5.5

6

6.5

7

Sys

tem

(S

ecto

r) T

hrou

ghpu

t (b

ps/H

z)

# of mobile stations

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

15

Cell edge Throughput

SV-steering vector

4 5 6 7 8 9 10 11 12

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

0.6

0.65

Cel

ledg

e T

hrou

ghpu

t (b

ps/H

z)

# of mobile stations

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

16

CDF of User Throughput –Light load (4 mobile stations)

SV-steering vector

0 0.5 1 1.5 2 2.5 3 3.50

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

User Throughput (bps/Hz)

CD

F

# of mobile stations =4

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

17

CDF of User Throughput –Heavy load (12 mobile stations)

SV-steering vector

0 0.2 0.4 0.6 0.8 1 1.2 1.40

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

User Throughput (bps/Hz)

CD

F

# of mobile stations =12

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

SIMULATION RESULTS – 8TXMU-MIMO SYSTEM PERFORMANCE (SCM CHANNEL)-URBAN MICRO

18

19

Sector Throughput

SV-steering vector

4 5 6 7 8 9 10 11 123.8

4

4.2

4.4

4.6

4.8

5

5.2

5.4

5.6

5.8

Sys

tem

(S

ecto

r) T

hrou

ghpu

t (b

ps/H

z)

# of mobile stations

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

20

Cell edge Throughput

SV-steering vector

4 5 6 7 8 9 10 11 12

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

Cel

ledg

e T

hrou

ghpu

t (b

ps/H

z)

# of mobile stations

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

21

CDF of User Throughput –Light load (4 mobile stations)

SV-steering vector

0 0.5 1 1.5 2 2.5 3 3.50

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

User Throughput (bps/Hz)

CD

F

# of mobile stations =4

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

22

CDF of User Throughput –Heavy load (12 mobile stations)

SV-steering vector

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

User Throughput (bps/Hz)

CD

F# of mobile stations =12

MU-MIMO 8x2-SV

MU-MIMO 8x2-Unitary

23

Sector Throughput :Urban Macro

4 5 6 7 8 9 10 11 124

4.5

5

5.5

6

6.5S

yste

m (

Sec

tor)

Thr

ough

put

(bps

/Hz)

# of mobile stations

AWD-0.5

Unitary -0.5

AWD-0.7

Unitary -0.7