Proposed Text of Primary Advanced Preamble for the IEEE 802.16m Amendment
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16m-09/1463
Date Submitted:
2009-7-6
Source:
Zheng Yan-Xiu, Yu-Chuan Fang, Chang-Lan Tsai, Chung-Lien Ho
E-mail: zhengyanxiu@itri.org.tw.
ITRI
Venue:
IEEE 802.16m-09/0028r1, Call for contributions on 16m AWD content
“Comments on AWD 15.3.6.1.1 Primary Advanced Preamble”
Base Contribution: IEEE C802.16m-09/1463
Purpose:
To be discussed and approval by IEEE 802.16m TG
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Motivation
• Increase the number of PA-Preamble
sequences
• Enhance reception performance for single
frequency network like PA-Preamble
deployment
• Detect multiple basestation types
• Facilitate CSG/OSG femto BS and microcell
BS detection
Anchor based MFSK
• Anchor carrier is overlapped for all PA-Preambles to facilitate the lock of
center frequency
• MFSK interleaves PA-Preambles on frequency domain to reduce
interference to different PA-Preambles
• An AMS can detect macro BS and femto BS at the same time to facilitate
handover procedure
• CSG femto BS does not interfere the performance of PA-Preamble
detection and further enhance the synchronization performance due to
overlapped anchor carrier
• Low detection complexity: only 15 subcarriers correlation detector is
applied
Subcluster-based MIMO scheme
• Different subclusters are rotated with different phase rotation from different
basestations
• The scheme avoids signal cancellation on frequency domain and increase
the PA-Preamble detection performance
Anchor based MFSK vs. CDM
Anchor based MFSK
CDM
•
•
Single frequency network
–
–
•
BS type:
–
–
–
–
•
•
All Preambles are either interlaced on frequency
domain or the same on overlapped subcarriers
MFSK with anchor carrier assists in detecting PAPreamble with different Preambles
The preamble allows multiple PA-Preamble sends at
the same time
Multiple BS types are differentiated at the same time
It facilitate the handover form macro BS to CSG/OSG
femto BS or micro BS to share the load from macro BS
Less brute-force SA-Preamble detection can be avoided
Low complexity: only 15 subcarriers
correlation detection can be applied
More sequences: 17 sequences
Single frequency network
–
–
•
BS type:
–
•
•
Only one PA-Preamble send within entire network
CDM will degrade the detection performance
CDM
It degrades the performance of PA-Preamble due
to overlapped scenario
High complexity: at least 216 subcarriers
differential detection is necessary
Less sequences: 11 sequences
Information Content
Index
Carrier
ABS type
0
BW
5 MHz
1
ABS included in NBR_ADV
2
10 MHz
20 MHz
3
N/A
4
N/A
5
N/A
6
N/A
7
N/A
Fully configured
N/A
N/A
N/A
N/A
N/A
N/A
8
N/A
9
N/A
10
N/A
N/A
11
N/A
N/A
12
N/A
N/A
13
N/A
N/A
14
N/A
N/A
15
CSG femto BS
N/A
N/A
N/A
16
Partially configured
N/A
Simulation Results
• Detection performance for A-Preamble
is evaluated
• Detection performance of PA-Preamble
• Two proposals
– ITRI PA-Preamble with IEEE
802.16m SA-Preamble
– IEEE 802.16m PA-Preamble and
SA-Preamlbe
• Three scenarios:
– PA-Preamble detection
performance without timing error
– A-Preamble detection performance
with real timing estimation
• No interference
• SIR=2dB
PA-Boosting level [dB]
Comp\FFT
512
IEEE 802.16m
7.58
17.9287
ITRI
17.3249
ITRI MBS
SA-Boosting level [dB]
Comp\FFT
512
IEEE 802.16m
7.11
Channel Bandwidth
5MHz
Center frequency
2.5GHz
Frequency offset
10ppm
Over-sampling Factor
28/25
FFT Size
512
Cyclic prefix (CP) ratio
1/8
Channel condition
PB3, VA60, VA120
The number of antennas
Tx:2, Rx:1
Modulation
BPSK, QPSK,MPSK
Receiver
Differential Detection for
IEEE 802.16m
Cluster-based correlator and
energy detection for ITRI
PA-Preamble Detection Performance under
Single Frequency Network for ITRI Proposal
• Scenario:
– Two transmission
antennas
– Two basestations
– Perfect timing
– Identical transmission
power
• ITRI’s proposal renders
better detection
performance
• ITRI’s proposal avoids
signal cancellation within
the network
A-Preamble Detection Error Rate with No
Interference
• ITRI and IEEE
802.16m proposals
render similar
performance
• No performance
degradation
A-Preamble Detection Error Rate with SIR=2dB
• ITRI’s proposal
provides better
detection
performance
• It comes from
better PAPreamble detection
• When we consider
that whole network
applies identical
PA-Preamble,
ITRI’s proposal is
more competitive
Conclusion
• Anchor based MFSK PA-Preamble provides more system
features comparing to AWD CDM PA-Preamble
– Detect multiple BS types at the same time
– Less detection complexity
– CSG femto BS can be distinguished in case of introducing redundant
SA-Preamble detection
– More PA-Preamble sequences
• MFSK PA-Preamble provides better performance to CDM
PA-Preamble and enhances A-Preamble detection performance
• Adopt the proposed text in C802.16m-09/XXXX