PROVISIONAL APPLICATION UNDER 37 C.F.R. §1.53(c)
`TRANSMITTAL FORM
`
`PTO
`05$_c:
`:3I‘\
`QC)
`Docket Number: TI-37032PS§‘°
`
`Hllllllllllllllllllllllllllllllllllllll
`
`09/05/03
`
`Mail Stop Provisional Patent Application
`Commissioner For Patents
`PO. Box 1450
`
`Alexandria, VA 22313-1450
`
`
`
`
`“EXPRESS MAIL ”
`
` Express Mailing Label Number: EV 333322956 US
`
`Date of Deposit: September 5l 2003
`
`
`I hereby certify that this paper or fee is being deposited with the United States
`
`
`Postal Service “Express Mail Post Office to Addressee" service under 37 CFR
`1.10 on the date indicated above and is addressed to the Commissioner For
`Patents as indicated.
`2.
`
`
`
`2'
`
`
`
`Spec w/Claims
`A Spec w/o Claims
`Formal drawings
`Informal drawings
`Other
`
`Number of Pages
`Number of Pages _5_
`Number of Sheets
`Number of Sheets
`Number of Pages
`
`Dear Sir:
`
`Enclosed application parts are:
`
`Inventors:
`
`
`
`
`m"-
`
`——_—
`_—
`
`
`
`
`CITY & FOREIGN COUNTRY)
`
`
`
`
`
`TITLE OF INVENTION:
`
`Scalable and Backwards Compatible Preamble for 11n
`
`CORRESPONDENCE ADDRESS: Wade James Brady III
`Customer Number 23494
`
`(972) 917-4418/4417
`
`Texas Instruments Incorporated
`P. O. Box 655474, WS 3999
`Dallas, Texas 75265
`
`PHONE: (972) 917-4371
`FAX:
`
`Was this invention made under a Government contract?
`
`x
`
`No
`
`Yes
`
`Identify contract and the Government agency:
`
`Please charge $160 to the deposit account of Texas Instruments Incorporated, Account No. 20-0668.
`An original and two copies are enclosed.
`
`Respectfully submitted,
`
`?VW
`
`3 Brady III
`Wade Ja
`Reg. No. 32,080
`
`62/5/03
`
`Date
`
`PROVISIONAL APPLICA TION ONLY
`
`
`
`
`
`
`
`
`
`
`HUAW41
`VS . SPH
`
`000001
`
`HUAWEI EXHIBIT 1015
`HUAWEI VS. SPH
`
`

`

`WLAN System Design
`
`"
`
`Rev. : 8/27/2003 5:02 PM
`
`DOCket N0 -
`Texas Instruments, Inc.
`T ‘ 3 7 0 3 2 PS
`Proprietary & Confidentic.
`Print:9/2/2003 11 :21 AM
`
`DRAFT
`
`Scalable and Backwards Compatible Preamble for IEEE 802.11n
`
`1
`
`Introduction
`
`The preamble for the lEEE 802.11n Standard involves a design that is backwards
`compatible, has low overhead and is scalable to multiple antennas. At the receiver,
`knowledge of the number of transmit antennas is not available ahead of time posing a
`unique problem for the design of the 802.11n preamble.
`
`In this document we present a novel invention which solves the aforementioned
`problems allowing for backwards compatibility and scalability to multiple transmit
`antennas.
`
`2
`
`Notation
`
`The following notation has been followed in the figures below.
`
`RECEIVED
`
`SEP 0 2 2003
`
`PATENT DEPT
`
`LS: OFDM symbol generated by the 53 subcarries given by L-26,26 = {1, 1, —1,—1, 1, 1, —
`1,1,—1,1,1,1,1,1,1,—1,—1,1,1,—1,1,-1,1,1,1,1,0,1,—1,—1,1,1,—1,1,—1,1,—
`1,—1,—1,—1,—1,1,1,—1,—1,1,—1,1,—1,1,1,1,1}.(identica/to11a)
`LS1: OFDM symbol generated by the 53 subcarries given by L1 -2526 = {1, -1, —1, 1, 1, -
`1,—1,-1,—1,—1,1,-1,1,-1,1,1,—1,-1,1,1,1,1,1,-1,1,-1,0,1,1,—1,-1,1,1,1,1,1,
`1,—1,1,—1,1,1,-1,-—1,1,1,1,1,1,1,-1,1,-1}.
`(odd tones ofnegative frequency of
`11a are negated and even tones of positive frequency are negated)
`-LS: OFDM symbol generated by the 53 subcarries given by L-26,26 = -1x{1, 1, —1, -1, 1,
`1,—1,1,—1,1,1,1,1,1,1,—1,—1,1,1,—1,1,—1,1,1,1,1,0,1,—1,—1,1,1,—1,1,—1,
`1,—1,—1,—1,—1,—1,1,1,—1,—1,1,—1,1,—1,1,1,1,1}.(a/Itonesof11aarenegated)
`-LS1: OFDM symbol generated by the 53 subcarries given by L1 .2616 = -1x{1, -1, —1, 1,
`1,—1,-—1,-1,—1,—1,1,-1,1,-1,1,1,~1,-1,1,1,1,1,1,-1,1,—1,0,1,1,—1,-1,1,1,1,1,
`1,1,—1,1,—1,1,1,-1,—1,1,1,1,1,1,1,-1,1,-1}.(eventonesofnegativefrequencyof
`11a are negated and odd tones of positive frequency are negated)
`
`SIG_L: Legacy signal field (modulated as in 802.11n standard)
`
`SIG_L1: SIG_L with odd tones of negative frequencies and even tones of positive
`frequencies negated
`
`SIG_N: 11n signal field (modulated as in Texas Instruments draft standard)
`
`SiG_N1: SIG_N with odd tones of negative frequencies and even tones of positive
`frequencies negated
`
`Gl2: Twice the appropriate cyclic prefix before the long sequences in pre-SIGNAL
`preamble
`
`GI: Appropriate cyclic prefix before each symbol
`
`DRAFT
`000002
`
`
`
`HUAW41
`«:Xi
`% T 1015
`
`
`
`
`
`
`
`
`HUAW 4'.
`VS .
`S PH
`
`000002
`
`HUAWEI EXHIBIT 1015
`HUAWEI VS. SPH
`
`

`

`WLAN System Design
`
`'
`
`Rev. : 8/27/2003 5:02 PM
`
`Texas Instruments, Inc.
`Proprietary & Confident.-.
`Print:9/2/2003 11:21 AM
`
`3
`
`Backwards Compatible Preamble
`
`DRAFT
`
`3.1
`
`1 TX Antenna
`
`
`
`Figure 1: Preamble for 1 transmit antenna
`
`0
`
`0
`
`Packet Detection, AGC, coarse frequency offset, and boundary detection are done during
`the short sequence.
`FFT placement, fine frequency offset, and Channel estimation are done during the long
`sequence.
`
`. The legacy Signal field sets the reserved bit to say that it is a HT mode.
`0 The new signal field gives more information (like new coding, new pilots, num Tx
`antennas, etc).
`
`3.2
`
`2 TX Antennas
`
`
`
`Figure 2: Preamble for 2 transmit antennas
`
`0 Channel estimation is done during the long sequence.
`. Channel Estimation is performed independently on the even and odd tones.
`o
`For the even tones, the channel estimated is (H1+H2)
`o
`For the odd tones it is (H1-H2).
`0 Assuming that the rank of channel is small (H1+H2) and (H1—H2) are estimated on
`all the tones and hence H1 and H2.
`
`3.3
`
`3 TX Antennas
`
`I
`
`2 of5
`
`PRELIMInggy DRAFT
`
`RECEIVED
`
`SEP 0 2 2003
`
`
`DEPT
`emit/5W; % T 1015
`
`
`
`
`
`
`
`
`
`
`HUAWA'. VS.
`
`SPI—I
`
`000003
`
`HUAWEI EXHIBIT 1015
`HUAWEI VS. SPH
`
`

`

`WLAN System Design
`
`Rev. : 8/27/2003 5:02 PM
`
`Texas Instruments, Inc.
`Proprietary & Confidenth
`Printz9/2/2003 11:21 AM
`
`
`
`Figure 3: Preamble for 3 transmit antennas
`
`. Channel estimation is done during the long sequence and new long seq.
`. Channel Estimation is performed as follows
`0 During the long seq
`-
`For the even tones, the channel estimated is (H1 + H2 + H3)
`-
`For the odd tones it is (H1 + H2 — H3).
`- Assuming that the rank of channel is small (H1 + H2 + H3) and (H1 + H2 —
`H3) are estimated on all the tones and hence (H1 + H2) and H3
`0 During the new long seq
`-
`For the even tones, the channel estimated is (H1 - H2 + H3)
`-
`For the odd tones it is (H1 - H2 — H3).
`- Assuming that the rank of channel is small (H1 - H2 + H3) and (H1 - H2 —
`H3) are estimated on all the tones and hence (H1 - H2) and H3
`From both the above steps we could estimate H1, H2, and H3
`
`0
`
`3.4
`
`4 TX Antennas
`
`
`
`Figure 4: Preamble for 4 transmit antennas
`
`RECENED
`
`SEP 0 2 2003
`
`3 of 5
`
`PRELIMINW DRAFT
`
`HUM?
`
`TENT DEPT
`
`a T 1015
`
`
`
`
`
`
`
`
`
`
`HUAWA'. VS.
`
`SPI—I
`
`000004
`
`HUAWEI EXHIBIT 1015
`HUAWEI VS. SPH
`
`

`

`WLAN System Design
`
`Rev. .' 8/27/2003 5:02 PM
`
`Texas Instruments, Inc.
`Proprietary 8. Confident.-.
`Print:9/2/2003 11:21 AM
`
`DRAFT
`
`. Channel Estimation is performed as follows
`0 During the long seq
`-
`For the even tones, the channel estimated is ((H1 + H2) + (H3 + H4))
`-
`For the odd tones it is ((H1 + H2) — (H3 + H4)).
`I Assuming that the rank of channel is small ((H1 + H2) + (H3 + H4)) and
`((H1 + H2) — (H3+H4)) are estimated on all the tones and hence (H1 + H2)
`and (H3 + H4)
`0 During the new long seq
`-
`For the even tones, the channel estimated is ((H1 - H2) + (H3 - H4))
`-
`For the odd tones it is ((H1 - H2) — (H3 - H4)).
`- Assuming that the rank of channel is small ((H1 - H2) + (H3 - H4)) and
`((H1 - H2) — (H3 — H4)) are estimated on all the tones and hence (H1 - H2)
`and (H3 — H4)
`From both the above steps we could estimate H1, H2, H3, and H4
`
`0
`
`3.5
`
`Some Fine Points
`
`0 The above preamble provides a nice upgrade to a 2x2 system with minimal overhead.
`The overhead for going to 3x3 and 4x4 is an addition of an extra long sequence (channel
`estimation sequence).
`In some sense it says that 2x2 is better than the rest and is clean.
`0 The new long seq is not the same as 11a, it is structured more like a couple of OFDM
`symbols. This helps in accommodating some of the delay of decoding SIGNAL fields.
`is not clear if we need two repeats.
`o The receiver always processes the odd and even tones of channel estimation sequence
`separately.
`lf it so happens to be a SISO system, one could just average the two
`individual estimates.
`
`It
`
`0 No issues with AGC or radio as all the TX chains are always on.
`
`RECElVED
`
`35p 0 2 2003
`
`PATENT DEPT
`
`4 of5
`PRELIMINARY DRAFT
`000005
`
`
`
`HUAW .1in a T 1015
`
`
`
`
`
`
`
`
`
`HUAW41
`VS .
`SPH
`
`000005
`
`HUAWEI EXHIBIT 1015
`HUAWEI VS. SPH
`
`

`

`We propose a family of preambles for MIMO systems which are backwards
`compatible with existing SISO systems and which enable the estimation all of
`tx/rx channel pairs. Estimation is facilitated by designing preambles which are
`orthogonal. At the receiver the orthogonality property is exploited to estimate
`linear combinations of tx/rx channel pairs. Linear processing applied to these
`linear combinations can then be employed to ascertain estimates of all tx/rx
`channel pairs.
`
`000006
`
`
`
`
`
`
`
` T 1015
`
`HUAW 4'.
`41X -1
`
`HUAWfl
`VS. SPH
`
`
`
`
`
`000006
`
`HUAWEI EXHIBIT 1015
`HUAWEI VS. SPH
`
`