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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 [email protected]
Jerry Pi, [email protected] Bruno Clerckx [email protected] Mazzarese [email protected]
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
Notice:This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein.
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
this contribution may be made public by IEEE 802.16.
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<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.
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
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