Smoothing Bit and Beam-Change Indication Bit for 2MHz Preamble

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Presentation transcript:

Smoothing Bit and Beam-Change Indication Bit for 2MHz Preamble Month Year doc.: IEEE 802.11-yy/xxxxr0 July 2012 Smoothing Bit and Beam-Change Indication Bit for 2MHz Preamble Date: 2012-07-10 Authors: Jianhan Liu, Mediatek Inc.. John Doe, Some Company

May 2012 Jianhan Liu, Mediatek Inc..

May 2012 Jianhan Liu, Mediatek Inc..

Beam-change Indication July 2012 Propose to Add Smoothing and Beam-change Indication Bit in SIG/SIGA Field Short preamble Long preamble SU MU Length / Duration 9 MCS 4 - BW 2 Aggregation 1 STBC Coding 5 SGI GID 6 Nsts 8 PAID Ack Indication 2 Smoothing Beam-change Indication Reserved CRC Tail Total 48 Jianhan Liu, Mediatek Inc..

Smoothing Indication in Short Preamble 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 estimate smoothing is recommended. A value of 0 indicates that only per-carrier independent (unsmoothed) channel 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..

Beam-Change Indication in Long SU Preamble 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 MU-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..

Beam-change Indication Jan 2012 Straw poll 1 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? Short preamble Long preamble SU MU Length / Duration 9 MCS 4 - BW 2 Aggregation 1 STBC Coding 5 SGI GID 6 Nsts 8 PAID Ack Indication 2 Smoothing Beam-change Indication Reserved CRC Tail Total 48 Yes: No: Abstain: Jianhan Liu, Mediatek Inc..

July 2012 Straw poll 2 Do you agree to add the following paragraph in the Specification Framework for Tgah in section R.3.2.1.1.E? 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: Jianhan Liu, Mediatek Inc..