1. QPSK Mapping Rule for Constellation Rearrangement
IEEE Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-09/1000r1
Date Submitted:
Source:
Zheng Zhao, Lei Zhou, Xufeng Zheng Voice:
China Samsung Telecom R&D Center
Sung-Eun Park, Jerry Pi, Seung Hoon Choi
Samsung Electronics
Venue: IEEE m Session#61, Cairo, Egypt
Re: Comments on AWD (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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2. 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

3. Proposed CoRe method for Rank 2 QPSK
Detection method
Time dependent channel
STBC’s ML detection method
Constructing the detection channel , where
Detection
b is the estimation for transmitted data
Time independent channel
Any detection method for MIMO spatial multiplexing system

4. Details of mapping rule for CoRe version
Two CoRe versions
Rank 2
Proposed mapping rule is enabled to deploy with low implementation complexity.
Constellation
Ncbps
CRV
Mapping Rule
First symbol
Second symbol
QPSK 2 b0 b1 b2 b3 1 b1 b0

5. 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

6. Performance evaluation [3]
Chase HARQ

7. 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 m-09/0010
Start text proposal
15.x Channel Encoding and HARQ
15.x HARQ
15.x.2.2 Constellation re-arrangement
Constellation-Rearrangement is supported in m. Co-Re is applied to QPSK, 16QAM and 64QAM.
In one HARQ process, all transmissions/retransmissions use the same Co-Re scheme.
15.x Co-Re Scheme
Co-Re scheme describes how Co-Re version is distributed in one subpacket.

8. Table 15.x.2.2.2-2: Constellation re-arrangement version (rank ≥ 2)
Conclusion
15.x Mapping Rule for Constellation Re-arrangement Version
Following table describes the operations that produces different Co-Re versions for QPSK,.
Table 15.x : Constellation re-arrangement version (rank ≥ 2)
Constellation
Ncbps
CRV
Mapping Rule
First symbol
Second symbol
QPSK 2 b0 b1 b2 b3 1 b1 b0