Transcript IEEE C802.16m-08/1155

Uplink 6x6 DRU Pilot Pattern Comparison
Document Number: C802.16m-08/1155
Date Submitted: 2008-09-05
Source:
Jianjun Li, Zhengzi Li, Jungnam Yun, Dongjun Lee, Jaehyeong Kim
Email: [email protected]
POSDATA Co, Ltd.
276-2, Seohyeon-dong, Bundang-gu, Seongnam-si,
Kyeonggi-do,463-775, Korea
Venue:
IEEE 802.16m-08/033 “Call for Contributions on Project 802.16m System Description Document (SDD)”, In response to the following
topics: “Call for Detailed Physical Layer Comments”
Purpose:
To be discussed and adopted by TGm for the 802.16m SDD.
Notice:
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contained herein.
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1
Proposed Pilot Patterns
OFDM Symbol Index (Time Axis)
OFDM Symbol Index (Time Axis)
Pilot for Ant1
Sub-carrier Index (Freq. Axis)
Sub-carrier Index (Freq. Axis)
Pilot for Ant0
Data tone
Pilot for Ant0
Pilot for Ant1
Pilot for Ant2
Pilot for Ant3
Data tone
•Figure 1. Pilot Pattern for 2 receive antennas
•Figure 2. Pilot Pattern for 4 receive antenna
The pilots of the proposed Pilot Pattern are allocated at the first, third, fourth and the last subcarrier along the subcarrier index.
The pilots are located at the first symbol, third, fourth symbol and the last symbol along the symbol index. The pilot pattern is
considering the frequency diversity and the Doppler. It keeps the best performance in high frequency selective and high
mobility.
Simulation assumptions
Burst Structure
Full loading (Assumption : 1 Packet = 1 FEC block; PER = BLER)
Offset
Pilot boosting
- No symbol offset / No sub-channel offset
- 3dB above the per data tone power for each transmit antenna
Number of antenna
- Number of Tx antenna : 2 (One Tx per one PSS, e.g. two PSSs)
- Number of Rx antenna : 2
Channel coding
QAM modulation
Uplink
(Horizontal Coding rate
Encoding) FEC block size (byte)
-
Convolutional Turbo Coding (CTC)
QPSK
1/2
60
MCS Combination
- QPSK 1/2 + QPSK 1/2
Radio channel model
- ITU-VEH-A (60km/h, 120km/h)
- ITU-PED-B (3km/h)
Transmit antenna correlation
Power Offset
- Uncorrelated
- 0 dB (No Power Offset between two PSSs)
Pilot Channel estimation
- Perfect estimation
- Practical estimation (Pilot Estimation, Averaging)
Decoding Algorithms
- MMSE
Comparisons of 3 proposals
OFDM Symbol Index (Time Axis)
OFDM Symbol Index (Time Axis)
OFDM Symbol Index (Time Axis)
Sub-carrier Index (Freq. Axis)
Sub-carrier Index (Freq. Axis)
Sub-carrier Index (Freq. Axis)
Pilot for Ant0
Pilot for Ant1
Data tone
Data tone
Data tone
•Intel Proposal
•MediaTek Proposal
•POSDATA Proposal
Simulations Results
UL CSM RB6X6 / Real Ch.Est / PED-B @ 3kmph
0
10
POSDATA
Intel
MediaTek
-1
PER
10
-2
10
-3
10
0
1
2
3
4
5
6
7
8
SNR [dB]
9
10
11
12
13
Figure 3. Performance of the Pilot Pattern for 2 receive antenna for DRU 6X6
14
Simulations Results
UL CSM RB6X6 / Practical Ch.Est / VEHA @ 60kmph
0
10
POSDATA
Intel
MediaTek
-1
PER
10
-2
10
-3
10
0
1
2
3
4
5
6
7
8
SNR [dB]
9
10
11
12
13
14
Figure 4. Performance of the Pilot Pattern for 2 receive antenna for DRU 6X6 for VEHA 60km/h
Simulations Results
UL CSM RB6X6 / Practical Ch.Est / VEHA @ 120kmph
0
10
POSDATA
Intel
MediaTek
-1
PER
10
-2
10
-3
10
0
1
2
3
4
5
6
7
8
SNR [dB]
9
10
11
12
13
14
Figure 5. Performance of the Pilot Pattern for 2 receive antenna for DRU 6X6 for VEHA 120km/h
Text Recommendations for SDD
Section 11 Physical Layer
• Section 11.6.3 Pilot structure
- For 6x6 uplink DRU pilot pattern, Figure 1 and
Figure 2 are used for 2 receiver antennas and 4
receiver antennas, respectively.
[copy & paste figure 1 and figure 2 of slides #3 here]
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