Transcript IEEE C802.16m-09/1876r1

Non-Adaptive Precoding for E-MBS with Macro-Diversity Support (E-MBS)
Document Number: IEEE C802.16m-09/1876r1
Date Submitted: 2009-09-20
Source:
Chih-Yuan Lin ([email protected]), Pei-Kai Liao ([email protected] ), Yu-Hao Chang ([email protected]),
and Paul Cheng ([email protected])
MediaTek Inc.
Venue:
IEEE Session #63.5, Hawaii, US
Re:
P802.16m/D1 E-MBS
Base Contribution: N/A
Purpose: Propose to be discussed and adopted by TGm for the use in Project 802.16m AWD
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Background (1/1)
▪ SFN-based E-MBS
– All neighboring BSs use same configuration
• MCS level, MIMO configuration, and other system parameters
• Subchannelization for E-MBS is not determined
• Only unicast OL SU-MIMO scheme is defined
▪ Possible to further improve system performance, if
subchannelization is subband-based CRU
▪ Randomization of precoder matrix/vector indices among BSs
– Leverage more diversity gain
– Make SFN coverage more complete
Non-Adaptive Precoding in E-MBS (1/2)
▪ Two-dimensional open-loop precoding assignment
– Frequency-domain
• Each BS changes precoding indices in frequency domain
– BS-domain
• Do cyclic shift operation on precoding indices of a base BS for other
neighboring BSs
– Precoding indices of neighboring BSs in a specific band are maximally kept different
• Can base on Cell_ID
PMI  (s  CellID ) mod N w
Non-Adaptive Precoding in E-MBS (2/2)
▪ Pseudo-random precoder matrices/vectors allocation in SFN-based
E-MBS
BS 0
BS 1
BS 2
BS 3
PMI #0
PMI #3
PMI #2
PMI #1
PMI #1
PMI #0
PMI #3
PMI #2
PMI #2
PMI #1
PMI #0
PMI #3
PMI #3
PMI #2
PMI #1
PMI #0
Simulation Results (1/3)
▪ Simulation parameters
Channel model
IMT-A UMa-nLOS (0.5 TX ant. sp.) 30 km/hr
System configuration
Single-frequency network
Bandwidth
10 MHz
Number of cells and number of sectors per cell
19 / 3
Number of users per sector
30 (uniformly distributed)
Sub-band based CRU
Subchannelization
Case 1: no subcarrier permutation
Case 2: data is evenly distributed across all CRU
Multi-antenna configuration
# of BS antennas: 4
# of MS antennas: 2
Receiver type
MMSE
Scheduling
Proportional Fair
Simulation Results (2/3)
▪ System level simulation
– 2-stream case
– Case 1: no subcarrier permutation
1
0.9
0.8
SU-MIMO in D1
Proposed method
No Precoder
0.7
CDF
0.6
0.5
0.4
0.2~0.4 dB performance
gain
0.3
0.2
0.1
0
18
19
20
21
22
23
SNR (dB)
24
25
26
Simulation Results (3/3)
▪ System level simulation
– 2-stream case
– Case 2: data is evenly distributed across all subband CRU resources
1
0.9
0.8
SU-MIMO in D1
0.7
Proposed method
No precoding
CDF
0.6
0.5
0.4
0.3
0.1~0.3 dB performance
gain
0.2
0.1
0
18
19
20
21
22
SNR (dB)
23
24
25
26
Conclusion (1/1)
▪ Two-dimensional OL precoder randomization
– Provide additional diversity over different resource blocks of different BSs in
SFN
▪ No signaling overhead is induced
Text Proposal