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Doc.: IEEE 802.11-12/0825 Submission July 2012 Smoothing Bit and Beam-Change Indication Bit for 2MHz Preamble Date: 2012-07-10 Authors: Slide 1Jianhan.

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Presentation on theme: "Doc.: IEEE 802.11-12/0825 Submission July 2012 Smoothing Bit and Beam-Change Indication Bit for 2MHz Preamble Date: 2012-07-10 Authors: Slide 1Jianhan."— Presentation transcript:

1 doc.: IEEE 802.11-12/0825 Submission July 2012 Smoothing Bit and Beam-Change Indication Bit for 2MHz Preamble Date: 2012-07-10 Authors: Slide 1Jianhan Liu, Mediatek Inc..

2 doc.: IEEE 802.11-12/0825 SubmissionSlide 2 May 2012 Jianhan Liu, Mediatek Inc..

3 doc.: IEEE 802.11-12/0825 SubmissionSlide 3 May 2012 Jianhan Liu, Mediatek Inc..

4 doc.: IEEE 802.11-12/0825 SubmissionSlide 4 July 2012 Propose to Add Smoothing and Beam-change Indication Bit in SIG/SIGA Field Short preambleLong preamble SU MU Length / Duration999 MCS44 - BW222 Aggregation11 - STBC111 Coding225 SGI111 GID -- 6 Nsts228 PAID99 - Ack Indication22 2 Smoothing1-- Beam-change Indication-1- Reserved444 CRC444 Tail666 Total48 Jianhan Liu, Mediatek Inc..

5 doc.: IEEE 802.11-12/0825 SubmissionSlide 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..

6 doc.: IEEE 802.11-12/0825 SubmissionSlide 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-changed Jianhan Liu, Mediatek Inc..

7 doc.: IEEE 802.11-12/0825 Submission Straw poll 1 Jan 2012 Slide 7 Short preambleLong preamble SU MU Length / Duration999 MCS44 - BW222 Aggregation11 - STBC111 Coding225 SGI111 GID -- 6 Nsts228 PAID99 - Ack Indication22 2 Smoothing1-- Beam-change Indication-1- Reserved444 CRC444 Tail666 Total48 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

8 doc.: IEEE 802.11-12/0825 SubmissionSlide 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..

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