Transcript IEEE C802.16m-09/1000

QPSK Mapping Rule for Constellation Rearrangement
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-09/1000
Date Submitted:
2009-04-28
Source:
Zheng Zhao, Lei Zhou, Xufeng Zheng
China Samsung Telecom R&D Center
Sung-Eun Park, Jerry Pi, Seung Hoon Choi
Samsung Electronics
Voice:
+86-10-5925333
E-mail:[email protected],
[email protected]
[email protected]
E-mail: [email protected]
[email protected]
[email protected]
Venue: IEEE 802.16m Session#61, Cairo, Egypt
Re:
Comments on AWD 15.3.12 (Channel coding HARQ-PHY)
Purpose: To provide details on mapping rule for constellation rearrangement and text proposal for the amendment text
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CoRe version design
•
Design method for Constellation Rearrangement version
– CoRe related descriptions in current SDD text
“ The CoRe can be expressed by a bit-level interleaver within a tone.”
– CoRe version should be designed with consideration of bit-level interleaver
within a symbol and across symbols within a tone.
• Bit-level interleaving of inter-symbols within a tone: to exploit spatial diversity gain
– The starting position is determined as SPID function in unit of 2 QAM symbols
Details of mapping rule for CoRe version
•
Mapping rule
• Two CoRe versions
•
Rank 2
Mapping Rule
Constellation
Ncbps
CRV
QPSK
2
0
b0
b1
QPSK
2
1
b3
b2
First symbol
Second symbol
b2
b1
b3
b0
• Proposed mapping rule is enabled to deploy with low implementation complexity.
Performance evaluation [1]
•
Simulation Parameters
Parameters
Assumption
Channel estimation
Perfect
Channel code/HARQ
CTC ½ / Chase
Modulation
QPSK
MIMO configuration
2 x 2 SM
Channel model
Rayleigh
MS mobility
0km/h
Receiver type
Linear MMSE
Maximum number of retransmission
2
Performance evaluation [3]
– Chase HARQ
0
CTC, Nep=480bits, QPSK, R=1/2, Rayleigh channel, spatial independent
10
FER
LGE-MMSE
new method-MMSE
-1
10
-2
10
-5
-4
-3
-2
-1
0
SNR
1
2
3
4
5
Conclusion
•
Adopt the following text proposal including mapping rule with 2 CoRe versions into
Section 15.x.2.2. (Constellation Rearrangement) of the Amendment text as in IEEE
802.16m-09/0010
-----------------------------Start text proposal-------------------------------15.x.
Channel Encoding and HARQ
15.x.2. HARQ
15.x.2.2 Constellation re-arrangement
Constellation-Rearrangement is supported in 802.16m. Co-Re is applied to QPSK,
16QAM and 64QAM.
In one HARQ process, all transmissions/retransmissions use the same Co-Re scheme.
15.x.2.2.1 Co-Re Scheme
Co-Re scheme describes how Co-Re version is distributed in one subpacket.
Conclusion
15.x.2.2.2
Mapping Rule for Constellation Re-arrangement Version
Following table describes the operations that produces different Co-Re versions for
QPSK,.
Table 15.x.2.2.2-2: Constellation re-arrangement version (rank ≥ 2)
Mapping Rule
Constellation
Ncbps
CRV
QPSK
2
0
b0
b1
b2
b3
QPSK
2
1
b3
b2
b1
b0
First symbol
Second symbol