doc.: IEEE 802.11-12/0908r1
July 2012
11af Interleaver Parameters
Date: 2012-07-16
Authors:
Name
Affiliations Address
Tevfik Yucek
Qualcomm
Sameer Vermani
Qualcomm
VK Jones
Qualcomm
Hemanth Sampath
Qaulcomm
Submission
Phone
3165 Kifer Road
+1 408 216
Santa Clara, CA
6864
5775 Morehouse
Drive, San Diego CA
3165 Kifer Road
Santa Clara, CA
5775 Morehouse
Drive, San Diego CA
Slide 1
email
[email protected]
Tevfik Yucek, Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
July 2012
Introduction
•
•
Motions passed in Atlanta define the basic PHY structure for 11af.
Interleaver parameters need to be selected based for the following
modes
– 2 contiguous and non-contiguous channels
– 4 contiguous and non-contiguous channels
•
Interleaver depth is determined by Ncol
–
–
•
Nrot is the third permutation applied to spatial streams
–
–
•
For 2 segment, Nsd = 216, so potential values for Ncol are: 2, 3, 4, 5, 6, 8, 9, 12, 18,
24, 27, 36, 54, 72, 108
For 4 segment, Nsd = 432, so potential values for Ncol are: 2, 3, 4, 5, 6, 8, 9, 12, 18,
24, 27, 36, 48, 54, 72, 108, 144, 216
For 2 segment, potential values Nrot = 1:54
For 4 segment, potential values Nrot = 1:108
11ac Ncol values are 18 for VHT40 (single segment 11af) and 26 for
VHT80. 11ac Nrot values are 29 for VHT40 (single segment 11af) and
58 for VHT80
Submission
Slide 2
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
July 2012
Methodology
•
•
1000 bytes per packets, 5000 realizations
We consider the following channel models
–
–
–
802.11n D channel model
SCM Urban Micro
SCM Urban Macro
•
•
•
•
MCS 0, MCS 3, MCS 5 and MCS 7 are simulated.
For each channel model and MCS, the best three Ncol values are found.
The Ncol value that is in best three for most of the time is selected.
The simulations/analysis is repeated for contiguous and non-contiguous two
segments and four segments modes
•
Once Ncol is fixed, repeat the same procedure for finding best Nrot value.
–
•
•
We considered 2x2 system with Nss=2 and 4x4 system with Nss=4.
Appendix-A gives some exemplary PER results for Ncol
Appendix-B gives some exemplary PER results for Nrot
Submission
Slide 3
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
Proposed Ncol Values
• Simulation outputs
– 2-segment Modes
• Best = 27, Second Best = 36, Third Best = 24
– 4-segment Modes
• Best = 48, Second Best = 54, Third Best = 36
• Based on the results above we proposed to use Ncol=27
for two segment operation and Ncol=48 for four
segment operation.
Submission
Slide 4
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
July 2012
Proposed Nrot Values
• Simulation outputs
– 2-Segment Modes
• Best = 46, Second Best = 54, Third Best = 50
– 4-Segment Modes
• Best = 78, Second Best = 94, Third Best = 101
• Based on the results above we proposed to use Nrot=46
for two segment operation and Nrot=78 for four
segment operation.
Submission
Slide 5
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
July 2012
Summary
• Number of rows and columns in the interleaver:
Parameter
TVHT_MODE_1
TVHT_MODE_2C
TVHT_MODE_2N
TVHT_MODE_4C
TVHT_MODE_4N
N_COL
18
27
48
N_ROW
6*N_BPSCS
8*N_BPSCS
9*N_BPSCS
N_ROT
29
46
78
Submission
Slide 6
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
Strawpoll - 1
• Do you agree to adapt Ncol=27 for two channel
operation and Ncol=48 for four channel operation?
– Y:
– N:
– A:
Submission
Slide 7
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
Strawpoll -2
• Do you agree to adapt Nrot=46 for two channel
operation and Nrot=78 for four channel operation?
– Y:
– N:
– A:
Submission
Slide 8
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
APPENDIX A: Ncol Simulations
Example Results
(Only MCS=3 is shown, other MCSs
have similar behavior)
Submission
Slide 9
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
2-Channel Cases
Submission
Slide 10
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
SCM U. Macro, 2-Contiguous, MCS=3
0
10
Ncol=108
Ncol=12
Ncol=18
Ncol=24
Ncol=27
Ncol=2
Ncol=36
Ncol=3
Ncol=4
Ncol=54
Ncol=6
Ncol=72
Ncol=8
Ncol=9
-1
PER
10
-2
10
-3
10
Submission
10
15
20
25
SNR
Slide 11
30
35
40
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
SCM U. Micro, 2-Contiguous, MCS=3
0
10
Ncol=108
Ncol=12
Ncol=18
Ncol=24
Ncol=27
Ncol=2
Ncol=36
Ncol=3
Ncol=4
Ncol=54
Ncol=6
Ncol=72
Ncol=8
Ncol=9
-1
PER
10
-2
10
-3
10
Submission
10
15
20
25
SNR
Slide 12
30
35
40
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
11n-D, 2-NonContiguous, MCS=3
0
10
Ncol=108
Ncol=12
Ncol=18
Ncol=24
Ncol=27
Ncol=2
Ncol=36
Ncol=3
Ncol=4
Ncol=54
Ncol=6
Ncol=72
Ncol=8
Ncol=9
-1
PER
10
-2
10
-3
10
Submission
10
15
20
25
SNR
Slide 13
30
35
40
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
SCM U. Micro, 2-NonContiguous, MCS=3
0
10
Ncol=108
Ncol=12
Ncol=18
Ncol=24
Ncol=27
Ncol=2
Ncol=36
Ncol=3
Ncol=4
Ncol=54
Ncol=6
Ncol=72
Ncol=8
Ncol=9
-1
PER
10
-2
10
-3
10
Submission
10
15
20
25
SNR
Slide 14
30
35
40
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
4-Channel Cases
Submission
Slide 15
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
SCM U. Micro, 4-Contiguous, MCS=3
0
10
Ncol=12
Ncol=144
Ncol=18
Ncol=216
Ncol=24
Ncol=27
Ncol=2
Ncol=36
Ncol=3
Ncol=48
Ncol=4
Ncol=54
Ncol=6
Ncol=72
Ncol=8
Ncol=9
-1
PER
10
-2
10
-3
10
Submission
10
15
20
25
SNR
Slide 16
30
35
40
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
SCM U. Macro, 4-Contiguous, MCS=3
0
10
Ncol=12
Ncol=144
Ncol=18
Ncol=216
Ncol=24
Ncol=27
Ncol=2
Ncol=36
Ncol=3
Ncol=48
Ncol=4
Ncol=54
Ncol=6
Ncol=72
Ncol=8
Ncol=9
-1
PER
10
-2
10
-3
10
Submission
10
15
20
25
SNR
Slide 17
30
35
40
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
11n-D, 4-NonContiguous, MCS=3
0
10
Ncol=12
Ncol=144
Ncol=18
Ncol=216
Ncol=24
Ncol=27
Ncol=2
Ncol=36
Ncol=3
Ncol=48
Ncol=4
Ncol=54
Ncol=6
Ncol=72
Ncol=8
Ncol=9
-1
PER
10
-2
10
-3
10
Submission
10
15
20
25
SNR
Slide 18
30
35
40
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
SCM U. Micro, 4-NonContiguous, MCS=3
0
10
Ncol=12
Ncol=144
Ncol=18
Ncol=216
Ncol=24
Ncol=27
Ncol=2
Ncol=36
Ncol=3
Ncol=48
Ncol=4
Ncol=54
Ncol=6
Ncol=72
Ncol=8
Ncol=9
-1
PER
10
-2
10
-3
10
Submission
10
15
20
25
SNR
Slide 19
30
35
40
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
March 2012
APPENDIX B: Nrot Simulations
Example Results
(Only MCS=3 is shown, other MCSs
have similar behavior)
Submission
Slide 20
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
July 2012
Sample Plot With all Nrot Values
11n-D, 2-NonContiguous, MCS=3
0
PER
10
-1
10
-2
10
10
15
20
25
SNR
Submission
Slide 21
30
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
Nrot=10
Nrot=11
Nrot=12
Nrot=13
Nrot=14
Nrot=15
Nrot=16
Nrot=17
Nrot=18
Nrot=19
Nrot=1
Nrot=20
Nrot=21
Nrot=22
Nrot=23
Nrot=24
Nrot=25
Nrot=26
Nrot=27
Nrot=28
Nrot=29
Nrot=2
Nrot=30
Nrot=31
35
Nrot=32
Nrot=33
Nrot=34
Nrot=35
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
July 2012
SCM U. Macro, 2-Contiguous, MCS=3
0
PER
10
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
-1
10
Nrot=21
Nrot=30
Nrot=34
Nrot=42
Nrot=45
Nrot=46
Nrot=50
Nrot=54
Nrot=21
Nrot=30
Nrot=34
Nrot=42
Nrot=45
Nrot=46
Nrot=50
Nrot=54
-2
10
10
15
20
25
30
35
SNR
Submission
Slide 22
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
July 2012
11n-D, 4-NonContiguous, MCS=3
0
PER
10
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
-1
10
Nrot=101
Nrot=66
Nrot=75
Nrot=78
Nrot=79
Nrot=87
Nrot=93
Nrot=94
Nrot=101
Nrot=66
Nrot=75
Nrot=78
Nrot=79
Nrot=87
Nrot=93
Nrot=94
-2
10
10
15
20
25
30
35
SNR
Submission
Slide 23
Qualcomm Inc.
doc.: IEEE 802.11-12/0908r1
July 2012
SCM U. Micro, 4-Contiguous, MCS=3
0
PER
10
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
2x2,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
4x4,
-1
10
Nrot=101
Nrot=66
Nrot=75
Nrot=78
Nrot=79
Nrot=87
Nrot=93
Nrot=94
Nrot=101
Nrot=66
Nrot=75
Nrot=78
Nrot=79
Nrot=87
Nrot=93
Nrot=94
-2
10
10
15
20
25
30
35
SNR
Submission
Slide 24
Qualcomm Inc.