Bit grouping method for CTC Channel Interleaver
Document Number: IEEE C802.16m-09/YYYY
Date Submitted: 2009-04-YY
Source:
Liang shengbao(sengbaol@cn.fujitsu.com), Zhou hua(zhouhua@cn.fujitsu.com), Tianjun(tianjun@cn.fujitsu.com),
Zhang Jie(jie.zhang@cn.fujitsu.com) and Xue Jinyin(xuejy@cn.fujitsu.com)
Fujitsu R&D Center CO.,Ltd Beijing.
Venue:
AWD: section 15.3.12.1.5.1 Convolutional Turbo Codes
In response to IEEE 802.16m-09/0020 “Call for Comments on Project 802.16m AWD”.
Base Contribution:
This is base contribution.
Purpose:
Propose to be discussed and adopted by TGm for the use in Project 802.16m AWD.
Notice:
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in
the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material
contained herein.
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Introduction
 In current amendment working document IEEE
802.16m-09/0010r1a

There are the following sections:
15.3.12.1.5.1 Convolutional turbo codes
15.3.12.1.5.1.x Bit grouping
 We propose information contents carried in the Bit
grouping section.
Introduction
 Background & Issues



Diversity between subblock A and subblock B exists, but not used in
current 16e ctc channel interleaver.
Diversity between subblock Y1 Y2  and subblock W1 W2  exists, but not
used in current 16e ctc channel interleaver.
Subblock Y2 and subblock W2 may always in low reliability bits of
16QAM modulation symbols.
A subblock
B subblock
Y1 subblock
Y2 subblock
W1 subblock
Subblock
interleaver
Subblock
interleaver
Subblock
interleaver
Subblock
interleaver
Subblock
interleaver
Subblock
interleaver
...
...
...
...
...
...
...
...
...
Existing IEEE 802.16e CTC interleaver
W2 subblock
...
Constellation remapping in lower
code rate scheme
 Proposal



Fully use the existing diversity between subblocks.
Group based interblock interleaving.
Symmetrical mapping between Y1/W1, Y2/W2.
 Bit grouping schemes for 16QAM
Constellation remapping in lower
code rate scheme
 Bit grouping scheme for 64QAM
Constellation remapping in lower
code rate scheme
 Simulation Results
PER comparison (Nep = 384 AWGN)
1.00E+00
BLER
1.00E-01
1.00E-02
1.00E-03
1.00E-04
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SNR(dB)
64QAM_1/2
64QAM_1/3
64QAM_2/3
64QAM_8/9
16QAM_1/3
16QAM_1/2
16QAM_2/3
21
Proposed text on IEEE 802.16m AWD
[Adopt the following modified text starting from line#13, page#134 in IEEE
802.16m-09/0010r1a]
The bit grouping methods should be designed separately for 16QAM and
64QAM:
For 16QAM
Proposed text on IEEE 802.16m AWD
For 64QAM
Reference
[1]
[2]
IEEE P802.16 Rev2 / D7, “Draft IEEE Standard for Local and Metropolitan
Area Networks: Air Interface for Broadband Wireless Access,” Oct. 2008.
IEEE 802.16m-08/003r8, “The Draft IEEE 802.16m System Description
Document”