Doc.: IEEE 802.11-12/0363r1 Submission Pilot Value Definitions March 2012 Seunghee Han, LG...
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doc.: IEEE 802.11-12/0363r1 Submission Pilot Value Definitions March 2012 Seunghee Han, LG Electronics Slide 1 Date: 2012-03-12 Authors: N am e A ffiliations A ddress Phone em ail Seunghee H an LG Electronics LG R& D Com plex A nyang-Shi, Kyungki-Do, Korea +82-31-450- 1852 seunghee.han@ lge.com Y ongho Seok LG Electronics Jinsoo Choi LG Electronics JeongkiKim LG Electronics Jin Sam K w ak LG Electronics Ron Porat Broadcom N iharJindal Broadcom V inko Erceg Broadcom Sam eerV erm ani Qualcom m Eugene Baik Qualcom m Lin Y ang Qualcom m H em anth Sam path Qualcom m V K Jones Qualcom m Richard V an N ee Qualcom m
Transcript of Doc.: IEEE 802.11-12/0363r1 Submission Pilot Value Definitions March 2012 Seunghee Han, LG...
doc.: IEEE 802.11-12/0363r1
Submission
Pilot Value Definitions
March 2012
Seunghee Han, LG ElectronicsSlide 1
Date: 2012-03-12Authors:Name Affiliations Address Phone email Seunghee Han LG Electronics LG R&D Complex
Anyang-Shi, Kyungki-Do, Korea
+82-31-450-1852
Yongho Seok LG Electronics
Jinsoo Choi LG Electronics
Jeongki Kim LG Electronics
Jin Sam Kwak LG Electronics
Ron Porat Broadcom
Nihar Jindal Broadcom
Vinko Erceg Broadcom
Sameer Vermani Qualcomm
Eugene Baik Qualcomm
Lin Yang Qualcomm
Hemanth Sampath Qualcomm
VK Jones Qualcomm
Richard Van Nee Qualcomm
doc.: IEEE 802.11-12/0363r1
Submission
March 2012
Seunghee Han, LG ElectronicsSlide 2
Name Affiliations Address Phone email Hongyuan Zhang Marvell Yong Liu Marvell Raja Banerjea Marvell Eldad Perahia Intel Tom Tetzlaff Intel Tom Kenney Intel Jianhan Liu MediaTek Vish Ponnampalam
MediaTek
ChaoChun Wang MediaTek James Wang MediaTek James Yee MediaTek
George Calcev Huawei
Bin Chen Huawei
Young Hoon Kwon
Huawei
Junghoon Suh Huawei
Tianyu Wu Huawei
doc.: IEEE 802.11-12/0363r1
Submission
March 2012
Seunghee Han, LG ElectronicsSlide 3
Name Affiliations Address Phone email Sun Bo ZTE Lv, Kaiying ZTE Huai-Rong Shao Samsung Chiu Ngo Samsung Minho Cheong ETRI Jae Seung Lee ETRI Heejung Yu ETRI
doc.: IEEE 802.11-12/0363r1
Submission
Motivation
• Pilot tones in data OFDM symbols can be used for the purpose of phase tracking and for compensation of residual frequency offset error after initial compensation.
• For >= 2MHz mode, it is straightforward to adopt pilot values and tone indices as in 11ac spec [2] applying down-clocking by a factor of 10.
• Since the Pilot tone indices and values for 1MHz mode cannot be obtained by down-clocking from 11ac, the specification is needed.
– We have pilot tone indices based on [3] stating “Define 1MHz tone allocation as: 24 Data tones, 2 Pilot tones at tone indices +/-7, 3 Guard tones on left and 2 guard tones on right, and 1 DC tone [11/1484r6]”.
– However, the pilot values need to be defined.
March 2012
Seunghee Han, LG ElectronicsSlide 4
doc.: IEEE 802.11-12/0363r1
Submission
Background (1/2)
• Design principle on pilot sequence in 11ac [1]– For fast phase tracking, identical pilot sequence values are used for all space-time
streams in data symbols in 11ac so that the receiver can track phase without MIMO channel estimation on pilot tones.
– For 20 and 40 MHz, the pilot sequence shall be the single spatial stream pilot sequence of 11n copied to the NSTS streams before the per-stream CSDs are applied.
– For 80 MHz, the pilot sequence shall be the following sequence (which is the 40 MHz pilot sequence for NSTS = 1 extended with a [1, 1] on the right, resulting in the lowest PAPR on the pilot tones after applying [1 -1 -1 -1] rotation on the 20 MHz subbands), copied to the NSTS streams before the per-stream CSDs are applied:
March 2012
Seunghee Han, LG ElectronicsSlide 5
0 1 2 3 4 5 6 7
1 1 1 -1 -1 1 1 1
20 MHz 1ss pilot sequence
40 MHz 1ss pilot sequence
doc.: IEEE 802.11-12/0363r1
Submission
Background (2/2)
• Further design principles on pilot sequence in 11ac– BPSK based (+1 or -1) pilot sequence values to avoid complex
multiplication by using sign converter.
– Both time and frequency domain varying pilot sequence values by means of• Modulo operation as a function of symbol index n in both time and
frequency domains
• Pseudo random sequence (ie. pn as defined in [5]) to prevent the generation of spectral line [4]
– The worst case would be that all elements have the same signs (eg. All ‘1’ or all ‘-1’).
March 2012
Seunghee Han, LG ElectronicsSlide 6
doc.: IEEE 802.11-12/0363r1
Submission
Proposed Design Criteria for Pilot Values
• For >= 2MHz mode,– Reuse the definitions as in 11ac
• For 1 MHz mode,– Succeed the design philosophy of 11ac with;
• Minimum impact on specification works– Single table for pilot values with nested property for all bandwidths
• BPSK based sequence value for low complexity• Provision of both time and frequency domain varying sign properties
with modular operation
• It is noted that pseudo random sequence pn is further applied to avoid spectral line [5]. Not part of our proposal
March 2012
Seunghee Han, LG ElectronicsSlide 7
doc.: IEEE 802.11-12/0363r1
Submission
Proposal on Pilot Values for 1 MHz Mode
• Based on slide 7,– For a 1MHz transmission, two pilot tones shall be inserted in
. The pilot mapping for subcarrier for symbol shall be as specified in the following equation.
where is given in the right table and where n is the DATA symbol index .
March 2012
Seunghee Han, LG ElectronicsSlide 8
0 1 2 3 4 5 6 7
1 1 1 -1 -1 1 1 1
2 MHz 1ss pilot sequence
4 MHz 1ss pilot sequence
1 MHz 1ss pilot sequence
8 MHz 1ss pilot sequence
7,7k k
nP k n
7,7
mod 2 2 1 mod 2 2,n n n
P
7,7 0knP
m
Table 22-20 in 11ac D2.0
doc.: IEEE 802.11-12/0363r1
Submission
Proposal on Pilot Values for >=2 MHz Modes
• Based on slide 7,– The pilot mapping and values for 2/4/8/16 MHz transmissions,
respectively, refer those for 20/40/80/160 MHz transmissions in section 22.3.10.10 (Pilot subcarriers) of IEEE P802.11ac™/D2.0 with the same pilot positions and values.
March 2012
Seunghee Han, LG ElectronicsSlide 9
knP
doc.: IEEE 802.11-12/0363r1
Submission
References
[1] Richard van Nee et al, “Pilot Sequence for VHT-DATA”, IEEE 802.11-10/0811r1
[2] Draft P802.11ac_D2.0
[3] Minyoung Park, “Proposed Specification Framework for TGah”, IEEE 802.11-11/1137r5
[4] Matthew S. Gast, “802.11 Wireless Networks – The Definitive Guide”, O’REILLY
[5] Draft P802.11REVmb_D12.0
March 2012
Seunghee Han, LG ElectronicsSlide 10
doc.: IEEE 802.11-12/0363r1
Submission
Motion 1
• Move to accept the insertion of following at R.3.2.3.2.A of the spec framework as pilot mapping and values for 1MHz mode for SIG and DATA?– For a 1MHz transmission, two pilot tones shall be inserted in
. The pilot mapping for subcarrier for symbol shall be as specified in the following equation.
where is given in the right table.
March 2012
Seunghee Han, LG ElectronicsSlide 11
0 1 2 3 4 5 6 7
1 1 1 -1 -1 1 1 1
2 MHz 1ss pilot sequence
4 MHz 1ss pilot sequence
1 MHz 1ss pilot sequence
8 MHz 1ss pilot sequence
7,7k k
nP k n
7,7
mod 2 2 1 mod 2 2,n n n
P
7,7 0knP
m
Table 22-20 in 11ac D2.0
doc.: IEEE 802.11-12/0363r1
Submission
Motion 2
• Move to accept the insertion of following at the spec framework as pilot mapping and values for 2/4/8/16 MHz modes for SIG and DATA?– The pilot mapping and values for 2/4/8/16 MHz transmissions,
respectively, are same as those for 20/40/80/160 MHz transmissions in section 22.3.10.10 (Pilot subcarriers) of IEEE P802.11ac™/D2.0.
March 2012
Seunghee Han, LG ElectronicsSlide 12
knP
