1. Sounding and P Matrix Proposal
Month Year
Month Year
doc.: IEEE yy/xxxxr0
doc.: IEEE yy/xxxxr0
Sounding and P Matrix Proposal
Date:
Authors:
Slide 1
Vinko Erceg et al.
Page 1
John Doe, Some Company
John Doe, Some Company

2. Introduction Sounding Format 6x6 and 8x8 P matrices
P matrices for Nsts<=4
Straw polls
Vinko Erceg et al.

3. Sounding Mechanism (1) In 11n, there are multiple sounding formats:
Staggered sounding
NDP sounding
It would be desirable in TGac to converge onto a single sounding format
Compatibility and interoperability complications with multiple formats
Our proposal is to converge onto a single sounding mechanism:
NDP sounding frame format
Slide 3
Vinko Erceg et al.

4. Sounding Mechanism (2) NDP sounding advantages
Defines a cleaner and simpler immediate feedback protocol
ACK is not required
Less latency in providing CSI feedback when to compared to staggered sounding
No Data present
May be important for MU feedback
Channel staleness problem
Only channel estimation for CSI feedback is performed after receiving an NDP packet
Potential parallel processing for data demodulation is avoided
Works well with MU sounding mechanism
Sounding for multiple users
Slide 4
Vinko Erceg et al.

5. P Matrix Definition (1)
In TGac, new P matrices for Nsts > 4 need to be defined
Proposal to define 6x6 DFT matrix P as follows
Slide 5
Vinko Erceg et al.

6. P Matrix Definition (2) Proposal to define 8x8 matrix P as follows:
where P4x4 is the 11n 4x4 P matrix
Slide 6
Vinko Erceg et al.

7. P Matrix Definition (3)
We propose the same P matrix as in 11n, when Nsts<=4 in 11ac packets
We propose not to include 5x5 and 7x7 P matrices in the draft Tgac standard due to implementation complexity reasons
Slide 7
Vinko Erceg et al.

8. Straw Polls
Vinko Erceg et al.

9. Straw Poll #1
Do you support adding the following item into the specification framework document, 11-09/0992?
R3.2.1.J: All VHT transmissions shall have a preamble which contains a single section of long training fields,  with each long training field multiplied by entries belonging to a single P matrix, to enable channel estimation at the receiver.
Yes:
No:
Abs:
Vinko Erceg et al.

10. Straw Poll #2
Do you support adding the following item into the specification framework document, 11-09/0992?
R3.2.2.C: The draft specification shall include null data packet (NDP) as the only preamble format for sounding PPDUs.
Yes:
No:
Abs:
Vinko Erceg et al.

11. Straw Poll #3
Do you support adding the following item into the specification framework document, 11-09/0992?
R3.2.1.K: The single section of long training fields consists of one, two, four, six or eight VHT long training fields (VHT-LTFs) that are necessary for demodulation of the VHT-Data portion of the PPDU or for channel estimation during an NDP packet.
Yes:
No:
Abs:
Vinko Erceg et al.

12. Straw Poll #4
Do you support adding the following item into the specification framework document, 11-09/0992?
R3.2.1.K: The VHT-LTF mapping matrix P for one, two or four VHT-LTFs shall be the same as defined in n standard specification (Section , Eq. (20-27)).
Yes:
No:
Abs:
Vinko Erceg et al.

13. Straw Poll #5
Do you support adding the following item into the specification framework document, 11-09/0992?
R3.2.1.L: The VHT-LTF mapping matrix P for six VHT-LTFs shall be as defined in slide 4 of 11-10/00xxr0.
Yes:
No:
Abs:
Vinko Erceg et al.

14. Straw Poll #6
Do you support adding the following item into the specification framework document, 11-09/0992?
R3.2.1.L: The VHT-LTF mapping matrix P for eight VHT-LTFs shall be as defined in slide 5 of 11-10/00xxr0.
Yes:
No:
Abs:
Vinko Erceg et al.