Performance of 8-Antenna Pilot Patterns IEEE 802.16m
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16m-09/0778
Date Submitted:
2009-04-23
Source:
Ramesh Annavajjala, Phil Orlik, Amine Maaref
Zhifeng (Jeff) Tao, Jinyun Zhang
Mitsubishi Electric Research Laboratories
Toshiyuki Kuze
Mitsubishi Electric Corporation
{annavajjala,porlik,maaref,tao,jzhang}@merl.com
Kuze.Toshiyuki@ah.MitsubishiElectric.co.jp
Venue:
Re : 802.16m AWD
Base Contribution:
IEEE C802.16m-09/0778
Purpose:
To be discussed in TGm in support of the IEEE 802.16m amendment text proposed in C80216m-09_0778.doc
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.
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1
Background
• In Section 11.5.3.1 of SDD (IEEE 802.16m08/003r8), pilot patterns for 8-stream MIMO
is still FFS
• Current Amendment Document (IEEE
802.16m-09/0010r1a) did not yet describe
pilot patterns for 8 transmit antennas
• This contribution proposes 8-tx antenna pilot
pattern in the amendment document for the
IEEE 802.16m downlink
2
8Tx Pilot Pattern 1
• Current proposal
• 8 pilot streams
– Overhead: 4/108 = 3.7% per stream
– Total overhead 32/108 = 29.62%
• With four streams, (P1,P2,P3,P4) are the
pilot locations corresponding to existing 4stream MIMO
• The proposed design allows for better
time/frequency offset estimation along with
improved interpolation with 2D-MMSE
channel estimation
• For 5-symbol sub-frame remove, remove
either 3rd or 4th OFDM symbol
• For 7-symbol sub-frame, append the 3rd/4th
OFDM symbol to the end of the 6-symbol
sub-frame
P1 P3
P6
P2 P4
P7
P5
P8
P2 P4
P1 P3
P7
P6
P8
P6
P5
P7
P5
P8
P3 P1
P4 P2
P7
P6
P8
P4 P2
P5
P3 P1
3
8Tx Pilot Pattern 2
• Proposed by Samsung (C802.16m-09/0515.doc)
• 8 pilot streams
– Overhead: 3/108 = 2.78% per stream
– Total overhead 24/108 = 22.22%
• Limiting performance for frequency-selective
channels (like Ped-B)
• Will not allow for estimation/compensation of
time/frequency offsets (at best two differential
estimates per stream)
P2 P 5
P7 P 4
P6 P1
P3 P8
P6 P 1
P8 P 3
P2 P5
P4 P7
P5 P 2
P4 P 7
P1 P6
P8 P3
4
Simulation Assumptions
• Block Error Rate (BLER) is the metric
• Pilot Patterns: P1 versus P2
– Ideal performance (genie) is also simulated
• Modified ITU Channel Models
– Veh-A with 0, 100 and 250 Hz Doppler
– Ped-B with 6 Hz Doppler
•
•
•
•
2D-MMSE channel estimation per resource block
8-by-8 MIMO with rank-8 transmission
Distributed RBs
WiMax Turbo Code with QPSK-1/2, 16QAM-3/4 and 64QAM5/6
– Appropriate rate matching to fit FEC blocks into RBs
QPSK-1/2. m-Ped-B, 6 Hz
ITU-Ped-B. 6 Hz Doppler. QPSK, Rate-1/2. 10 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
0
2
4
6
SNR [dB]
8
10
12
QPSK-1/2. m-Veh-A, 0 Hz
ITU-Veh-A. 0 Hz Doppler. QPSK, Rate-1/2. 10 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
0
2
4
6
SNR [dB]
8
10
12
QPSK-1/2. m-Veh-A, 100 Hz
ITU-Veh-A. 100 Hz Doppler. QPSK, Rate-1/2. 10 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
0
2
4
6
SNR [dB]
8
10
12
QPSK-1/2. m-Veh-A, 250 Hz
ITU-Veh-A. 250 Hz Doppler. QPSK, Rate-1/2. 10 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
0
2
4
6
SNR [dB]
8
10
12
16QAM-3/4. m-Ped-B, 6 Hz
ITU-Ped-B. 6 Hz Doppler. 16-QAM, Rate-3/4. 3 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
14
16
18
20
22
24
SNR [dB]
26
28
30
32
16QAM-3/4. m-Veh-A, 0 Hz
ITU-Veh-A. 0 Hz Doppler. 16-QAM, Rate-3/4. 3 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
14
16
18
20
22
24
SNR [dB]
26
28
30
32
34
16QAM-3/4. m-Veh-A, 100 Hz
ITU-Veh-A. 100 Hz Doppler. 16-QAM, Rate-3/4. 3 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
14
16
18
20
22
24
SNR [dB]
26
28
30
32
34
16QAM-3/4. m-Veh-A, 250 Hz
ITU-Veh-A. 250 Hz Doppler. 16-QAM, Rate-3/4. 3 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
14
16
18
20
22
24
SNR [dB]
26
28
30
32
64QAM-5/6. m-Ped-B, 6 Hz
ITU-Ped-B. 6 Hz Doppler. 64-QAM, Rate-5/6. 2 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
20
22
24
26
28
30
SNR [dB]
32
34
36
38
40
64QAM-5/6. m-Veh-A, 0 Hz
ITU-Veh-A. 0 Hz Doppler. 64-QAM, Rate-5/6. 2 Slots
0
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
20
22
24
26
28
30
SNR [dB]
32
34
36
38
40
64QAM-5/6. m-Veh-A, 100 Hz
0
ITU-Veh-A. 100 Hz Doppler. 64-QAM, Rate-5/6. 2 Slots
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
20
25
30
35
SNR [dB]
40
45
64QAM-5/6. m-Veh-A, 250 Hz
0
ITU-Veh-A. 250 Hz Doppler. 64-QAM, Rate-5/6. 2 Slots
10
Block Error Rate
Genie
Pilot P1
Pilot P2
-1
10
-2
10
20
25
30
35
SNR [dB]
40
45
Conclusion
• Pilot Patterns 1 and 2 are within 1 to 1.5 dB of
the ideal performance
• Pilot Pattern 1 is uniformly better, by about
0.1 to 0.3 dB, than Pilot Pattern 2 for the
simulated channel conditions
• We recommend adopting Pilot Pattern 1
• Please see document C80216m-09_0778.doc
for the text proposal
18