Doc.: IEEE 802.11-12/0825 Submission July 2012 Smoothing Bit and Beam-Change Indication Bit for 2MHz...

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 [email protected]

James Wang MediaTek [email protected]

Thomas Pare MediaTek [email protected]

ChaoChun Wang MediaTek [email protected]

James Yee MediaTek [email protected]

Vish Ponnampalam MediaTek [email protected]

Kiran Uln MediaTek [email protected]

Eldad Perahia Intel Corp. [email protected] Shahrnaz Azizi Intel Corp. [email protected] Tom Tetzlaff Intel Corp. [email protected] Thomas Kenney Intel Corp. [email protected] Hongyuan Zhang Marvell [email protected] Sudhir Srinivasa Marvell [email protected] Yong Liu Marvell [email protected]

Yongho Seok LG Electronics [email protected]

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 [email protected] Ron Porat Broadcom [email protected] Rojan Chitrakar Panasonic [email protected]

nic.com Ken Mori Panasonic [email protected]

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 [email protected] Lv, Kaiying ZTE [email protected] Huai-Rong Shao Samsung [email protected] Chiu Ngo Samsung [email protected] Minho Cheong ETRI [email protected] Jae Seung Lee ETRI [email protected] Hyoungjin Kwon ETRI [email protected] Heejung Yu ETRI [email protected] Jaewoo Park ETRI [email protected] Sok-kyu Lee ETRI [email protected] 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 [email protected] Li Chia Choo I2R [email protected] Zhou Yuan I2R [email protected] Sumei Sun I2R [email protected] Ser Wah Oh I2R [email protected] George Calcev Huawei Rolling Meadows [email protected] Osama Aboul Magd Huawei [email protected] Young Hoon Kwon Huawei [email protected] Betty Zhao Huawei [email protected] David Yangxun Huawei [email protected] Bin Zhen Huawei [email protected]


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


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


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:


• 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


Doc.: IEEE 802.11-12/0825 Submission July 2012 Smoothing Bit and Beam-Change Indication Bit for 2MHz...

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