Post on 31-Dec-2015
doc.: IEEE 802.11-12/0825
Submission
July 2012
Smoothing Bit and Beam-Change Indication Bit for 2MHz Preamble
Date: 2012-07-10Authors:
Slide 1 Jianhan Liu, Mediatek Inc..
Name Affiliations Address Phone email
Jianhan Liu MediaTek jianhan.liu@mediatek.com
James Wang MediaTek james.wang@mediatek.com
Thomas Pare MediaTek thomas.pare@mediatek.com
ChaoChun Wang MediaTek chaochun.wang@mediatek.com
James Yee MediaTek james.yee@mediatek.com
Vish Ponnampalam MediaTek vish.ponnampalam@mediatek.com
Kiran Uln MediaTek kiran.uln@mediatek.com
Eldad Perahia Intel Corp. eldad.perahia@intel.com Shahrnaz Azizi Intel Corp. shahrnaz.azizi@intel.com Tom Tetzlaff Intel Corp. thomas.a.tetzlaff@intel.com Thomas Kenney Intel Corp. thomas.j.kenney@intel.com Hongyuan Zhang Marvell Hongyuan@marvell.com Sudhir Srinivasa Marvell sudhirs@marvell.com Yong Liu Marvell yongliu@marvell.com
Yongho Seok LG Electronics yongho.seok@lge.com
Jinsoo Choi LG Electronics Jeongki Kim LG Electronics Jin Sam Kwak LG Electronics
doc.: IEEE 802.11-12/0825
Submission Slide 2
May 2012
Name Affiliations Address Phone email Vinko Erceg Broadcom verceg@broadcom.com Ron Porat Broadcom rporat@broadcom.com Rojan Chitrakar Panasonic Rojan.Chitrakar@sg.panaso
nic.com Ken Mori Panasonic Mori.ken1@jp.panasonic.co
m Sameer Vermani Qualcomm Eugene Baik Qualcomm Lin Yang Qualcomm Hemanth Sampath Qualcomm Richard Van Nee Qualcomm Allert Van Zelst Qualcomm VK Jones Qualcomm Sun, Bo ZTE sun.bo1@zte.com.cn Lv, Kaiying ZTE lv.kaiying@zte.com.cn Huai-Rong Shao Samsung hr.shao@samsung.com Chiu Ngo Samsung chiu.ngo@samsung.com Minho Cheong ETRI minho@etri.re.kr Jae Seung Lee ETRI jasonlee@etri.re.kr Hyoungjin Kwon ETRI kwonjin@etri.re.kr Heejung Yu ETRI heejung@etri.re.kr Jaewoo Park ETRI parkjw@etri.re.kr Sok-kyu Lee ETRI Sk-lee@etri.re.kr Sayantan Choudhury Nokia Taejoon Kim Nokia Klaus Doppler Nokia Chittabrata Ghosh Nokia Esa Tuomaala Nokia
Jianhan Liu, Mediatek Inc..
doc.: IEEE 802.11-12/0825
Submission Slide 3
May 2012
Name Affiliations Address Phone email Zander Lei I2R Singapore +65-6408 2000 leizd@i2r.a-star.edu.sg Li Chia Choo I2R choolc@i2r.a-star.edu.sg Zhou Yuan I2R yzhou@i2r.a-star.edu.sg Sumei Sun I2R sunsm@i2r.a-star.edu.sg Ser Wah Oh I2R swoh@i2r.a-star.edu.sg George Calcev Huawei Rolling Meadows George.Calcev@huawei.com Osama Aboul Magd Huawei Osama.AboulMagd@huawei.com Young Hoon Kwon Huawei Younghoon.Kwon@huawei.com Betty Zhao Huawei Betty.Zhao@huawei.com David Yangxun Huawei David.Yangxun@huawei.com Bin Zhen Huawei ZhenBin@huawei.com
Jianhan Liu, Mediatek Inc..
doc.: IEEE 802.11-12/0825
Submission Slide 4
July 2012
Propose to Add Smoothing and Beam-change Indication Bit in SIG/SIGA Field
Short preamble Long preambleSU SU MU
Length / Duration 9 9 9MCS 4 4 -BW 2 2 2
Aggregation 1 1 -STBC 1 1 1
Coding 2 2 5SGI 1 1 1GID - - 6Nsts 2 2 8 PAID 9 9 -
Ack Indication 2 2 2 Smoothing 1 - -
Beam-change Indication - 1 -Reserved 4 4 4
CRC 4 4 4Tail 6 6 6Total 48 48 48
Jianhan Liu, Mediatek Inc..
doc.: IEEE 802.11-12/0825
Submission Slide 5
July 2012
Smoothing Indication in Short Preamble
• Channel smoothing can improve PER performance by 1~2dB– There is a smoothing bit in HT-SIG
• A value of 1 indicates that channel smoothing is recommended.• A value of 0 indicates that channel smoothing is not recommended.
• Smoothing bit can also partially serve as the beamforming indication– Beamformed channel generally can not be smoothed
Jianhan Liu, Mediatek Inc..
doc.: IEEE 802.11-12/0825
Submission Slide 6
July 2012
Beam-Change Indication in Long SU Preamble
• Beam-Change Indication: to tell if the pre-multiplied Q matrix is changed from Omni-portion to Data Portion– Channel Combination Gain
– Channel estimation from LTF1 and D-LTF1 can be combined if there is a beam-change indication
– 4.7dB gain on channel estimation MSE (3 CE symbols V.S. 1 CE symbol)
– Smoothing Gain• It could also serve as channel smoothing recommendation.
– Beam-change indication bit• A value of 1 indicates that Q matrix is changed; A value of 0 indicates that
Q matrix is un-changedJianhan Liu, Mediatek Inc..
doc.: IEEE 802.11-12/0825
Submission
Straw poll 1
Jan 2012
Slide 7
Short preamble Long preambleSU SU MU
Length / Duration 9 9 9
MCS 4 4 -
BW 2 2 2
Aggregation 1 1 -
STBC 1 1 1
Coding 2 2 5
SGI 1 1 1
GID - - 6
Nsts 2 2 8
PAID 9 9 -
Ack Indication 2 2 2
Smoothing 1 - -
Beam-change Indication - 1 -
Reserved 4 4 4
CRC 4 4 4
Tail 6 6 6Total 48 48 48
Do you agree to have a smoothing bit in short preamble SIG field and a beam-change indication bit in long SU preamble SIGA field?
Yes: No: Abstain:
Jianhan Liu, Mediatek Inc..
• Beam-change indication bit: • A value of 1 indicates that Q matrix is
changed;• A value of 0 indicates that Q matrix
is un-changed
doc.: IEEE 802.11-12/0825
Submission Slide 8
July 2012
• Do you agree to add the following paragraph in the Specification Framework for Tgah in section R.3.2.1.1.E?– Note: If the beam-change indication bit in long preamble is set to 0, the
receiver may do channel smoothing. Otherwise, smoothing is not recommended.
Yes: No: Abstain:
Straw poll 2
Jianhan Liu, Mediatek Inc..