doc.:IEEE 802.11-10/0566r1 Submission May 2010 Vinko Erceg et al. Slide 1 Sounding and P Matrix Proposal Authors: Date: 2010-05-16 Slide 1 N am e C om pany A ddress Phone em ail V inko Erceg Broadcom San D iego,C A 858 521 5885 verceg@ broadcom.com Joseph Lauer Broadcom 67 South B edford Street, Suite 400 W Burlington,M A 01803 [email protected]CarlosA ldana Broadcom Sunnyvale,C A rtm@ broadcom.com H ongyuan Zhang M arvell R aja Banerjea M arvell Eldad Perahia Intel Sam eer V erm ani Qualcom m Richard V an N ee Qualcom m Y ouhan K im A theros Youngsoo K im Sam sung
Transcript
doc.:IEEE 802.11-10/0566r1
Submission
May 2010
Vinko Erceg et al.Slide 1
Sounding and P Matrix Proposal
Authors: Date: 2010-05-16
Slide 1
Name Company Address Phone email Vinko Erceg Broadcom San Diego, CA 858 521 5885 [email protected]
Joseph Lauer Broadcom 67 South Bedford Street, Suite 400 W Burlington, MA 01803
• 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.Slide 3
doc.:IEEE 802.11-10/0566r1
Submission
May 2010
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.Slide 4
doc.:IEEE 802.11-10/0566r1
Submission
May 2010
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
)6/2exp( where
1
1
1
1
1
111111
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20161284
1512963
108642
54321
x66
jw
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P
)6/)1)(1(2exp(, nmjP nm
Vinko Erceg et al.Slide 5
doc.:IEEE 802.11-10/0566r1
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P Matrix Definition (2)
• Proposal to define 8x8 matrix P as follows:
where P4x4 is the 11n 4x4 P matrix
Slide 6
x44x44
x44x44
PP
PP
Vinko Erceg et al.Slide 6
doc.:IEEE 802.11-10/0566r1
Submission
May 2010
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.Slide 7
doc.:IEEE 802.11-10/0566r1
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Straw Polls
Vinko Erceg et al.Slide 8
doc.:IEEE 802.11-10/0566r1
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May 2010
Vinko Erceg et al.
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:
Slide 9
doc.:IEEE 802.11-10/0566r1
Submission
May 2010
Vinko Erceg et al.
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:
Slide 10
doc.:IEEE 802.11-10/0566r1
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Vinko Erceg et al.
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:
Slide 11
doc.:IEEE 802.11-10/0566r1
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Vinko Erceg et al.
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 802.11n standard specification (Section 20.3.9.4.6, Eq. (20-27)).
– Yes:
– No:
– Abs:
Slide 12
doc.:IEEE 802.11-10/0566r1
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Vinko Erceg et al.
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:
Slide 13
doc.:IEEE 802.11-10/0566r1
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May 2010
Vinko Erceg et al.
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
