August, 2013doc.: IEEE 802.11-13/0983r0
IEEE P802.11
Wireless LANs
Date: 2013-08-29
Author(s):
Name / Affiliation / Address / Phone / Email
Hongyuan Zhang / Marvell / 5488 Marvell Ln, Santa Clara, CA95054 / 408-222-1837 /
Eldad Perahia / Intel
Vinko Erceg / Broadcom
Youhan Kim / Qualcomm
Abstract: Resolutions of D6.0 comments on VHT-SIGB: CIDs 11002, 11003
11002 / Hongyuan Zhang / 22.3.3 / 241.28 / According to 22.3.8.3.6 VHTSIGB definition SIGB should apply segment parser/deparser for 160 or 80+80, to encode/modulate the 234 repeated bits. However the SIGB block diagram in Figure 22-6 does not cover the cases for 160MHz and 80+80MHz. The text also says that Figure 22-6 is SIGB modulation "in each segment"-implying direct duplication without segment parser.deparser. It looks like the two places are contradictory. Same issue for Figure 22-7. / Rename Figures 22-6 and 22-7 as SIGB for <=80MHz, add new figures for SIGB in 160MHz and 80+80MHz. Or alternatively, change 22.3.8.3.6 to reflect the block diagrams. In the second case, need to remove the 160MHz SIGB bit-map in Figure 22-20, because the encoding should start from the 80MHz SIGB bits. / Revised,See editing instructions in 11-13-0983r0.
11003 / Hongyuan Zhang / 22.3.4.8 / 249.46 / According to 22.3.8.3.6 (VHT-SIGB Definition), for 160 or 80+80MHz, segment parser (deparser) is needed to encode/modulate the 234 SIGB repeated bits . / Add segment parser and deparser in this subclause / Revised,
See editing instructions in 11-13-0983r0.
Discussions: 22.3.8.3.6 (VHT-SIGB Definition) should be the correct definition for VHT-SIGB in 160MHz or 80+80MHz, revise clauses 22.3.3 and 22.3.4.8 accordingly.
TGac Editor: Pls make the following changes on 23.3.3, page 240:
22.3.3 Transmitter block diagram
…
…
Figure 22-6 and Figure 22-7 show the transmit process for generating the VHT-SIG-B field of a VHT SU PPDU and VHT MU PPDU, respectively, using one frequency segmentin 20MHz, 40MHz or 80MHz bandwidth.
Figure 22-x and Figure 22-y show the transmit process for generating the VHT-SIG-B field of a 160MHz and a 80+80MHz VHT SU PPDU, respectively.
…
Figure 22-6—Transmitter block diagram for the VHT-SIG-B field of a 20MHz, 40MHz or 80MHz VHT SU PPDU
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Figure 22-7—Transmitter block diagram for the VHT-SIG-B field of a 20MHz, 40MHz or 80MHz VHT MU PPDU
TGac Editor: Pls insert the following two figures 22-x and 22-y after Figure 22-7:
Figure 22-x—Transmitter block diagram for the VHT-SIG-B field of a 160MHz VHT SU PPDU
Figure 22-y—Transmitter block diagram for the VHT-SIG-B field of a 80+80MHz VHT SU PPDU
(TGac Editor: pls allocate figure numbers for these two new figures, reorder the remaining figure numbers of clause 22, and put correct figure numbers in text,).
TGac Editor: Pls make the following changes on 23.3.4.8, page 249:
22.3.4.8 Construction of VHT-SIG-B
….
d) BCC encoder: Encode the VHT-SIG-B field using BCC at rate R=1/2 as described in 18.3.5.6 (Convolutional
encoder).
d1) Segment parser (if needed): For a contiguous 160 MHz or non-contiguous 80+80 MHz transmission, divide the output bits of the BCC encoder into two frequency subblocks as described in 22.3.10.7 (Segment parser). This block is bypassed for 20 MHz, 40 MHz and 80 MHz VHT PPDU transmissions.
(TGac Editor: pls also reorder the letters of each bullet in this subclause).
e) BCC interleaver: Interleave as described in 22.3.10.8 (BCC interleaver).
f) Constellation mapper: Map to a BPSK constellation as defined in 18.3.5.8 (Subcarrier modulation
mapping).
f1) Segment deparser (if needed): For a contiguous 160 MHz transmission, merge the two frequency subblocks into one frequency segment as described in 22.3.10.9.3 (Segment deparser). This block is bypassed for 20 MHz, 40 MHz, 80 MHz and 80+80 MHz VHT PPDU transmissions.
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Submissionpage 1Hongyuan Zhang, et. al.