January 2004
`
`doc.: IEEE 802.11-04/046r1
`
`New preamble structure for AGC
`in a MIMO-OFDM system
`
`Tsuguhide Aoki, Daisuke Takeda, Takahiro Kobayashi and Kazuaki Kawabata
`Corporate R&D center, TOSHIBA corporation
`
`tsuguhide.aoki@toshiba.co.jp
`
`Submission
`
`Slide 1
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000001
`
`
`
`doc.: IEEE 802.11-04/046r1
`
`New preamble structure for AGC
`in a MIMO-OFDM system
`
`Tsuguhide Aoki, Daisuke Takeda, Takahiro Kobayashi and Kazuaki Kawabata
`Corporate R&D center, TOSHIBA corporation
`
`tsuguhide.aoki@toshiba.co.jp
`
`Submission
`
`Slide 1
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000001
`
`
`
`January 2004
`
`doc.: IEEE 802.11-04/046r1
`
`Main scope of TGn
` “Achieve 100Mbps measured at MAC SAP” (PAR & FR)
`
`⇒MIMO-OFDM is one of the possible candidates.
`
` “Some of the modes shall be backwards compatible
`and interoperable with 802.11a and/or 802.11g” (PAR & FR)
`
` Backward compatibility between legacy 11a and
`MIMO-OFDM is one of the main issues.
` Preamble structure of 11a should be maintained
`in a MIMO-OFDM system.
`Alternatively, use protection mechanisms as defined in 11g (RTS-CTS, CTS self)
`
`Submission
`
`Slide 2
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000002
`
`
`
`January 2004
`
`Example of preamble structure for
`MIMO system
`
`doc.: IEEE 802.11-04/046r1
`
`Same as 11a
`→Backward compatibility
`
`Channel estimation for MIMO signals
`
`TX1
`TX2
`TX3
`TX4
`
`SP
`
`GI LP LP
`
`Sig
`
`Sig 2
`
`Indicate 11n preamble structure
`
`DATA
`
`DATA
`
`GI LP GI LP GI LP GI LP
`GI LP GI LP GI-LP GI-LP
`GI LP GI-LP GI-LP GI LP
`DATA
`GI LP
`GI-LP
`GI LP GI-LP
`DATA
`*Similar structure is presented in 03/714r0
` AGC for Tx1 could be performed by using the legacy SP.
` It is difficult to adjust the gain control for Tx2-Tx4 during
`MIMO signals because of the insufficient information for
`other antennas.
`→This causes a severe saturation or quantization error in
`ADC.
`
`Submission
`
`Slide 3
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000003
`
`
`
`January 2004
`
`doc.: IEEE 802.11-04/046r1
`
`New preamble structure with 2nd SPs
`for MIMO system
`2nd AGC
`2nd SP
`
`GI LP LP
`
`Sig
`
`Sig2
`
`GI LP GI LP GI LP GI LP
`GI LP GI LP GI-LP GI-LP
`GI LP GI-LP GI-LP GI LP
`
`2nd SP
`
`2nd SP
`
`1st AGC
`SP
`
`TX1
`TX2
`TX3
`TX4
`
`DATA
`
`DATA
`
`DATA
`DATA
`
`2nd SP
`
`GI LP GI-LP GI LP GI-LP
`
`2nd SP for MIMO-AGC
`
` The 1st AGC for Tx 1 could be performed by using legacy SP.
` The 2nd AGC for MIMO signals could be performed by using the 2nd SPs.
` The 2nd SP with same sequence for Tx1-Tx4 causes a Null (beamforming)
`effect.
`-->Different sequence should be used for the 2nd SP on each antenna.
`Submission
`Slide 4
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000004
`
`
`
`January 2004
`
`doc.: IEEE 802.11-04/046r1
`
`Simulated transmit signals with 2nd SP
`Total transmission power is always the same.
`MIMO DATA
`MIMO LP
`LP SIG1&2 2nd SP
`
`SP
`
`・・・
`
`Tx 1*
`
`Tx 2
`
`Tx 3
`
`Tx 4
`
`f f f f
`
`・・・
`
`・・・
`
`・・・
`
`*Tx 1 transmits same sequence of legacy SP.
`
`Base-band transmit signals (In-phase)
`
`Submission
`
`Slide 5
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000005
`
`
`
`January 2004
`
`doc.: IEEE 802.11-04/046r1
`
`Simulated receive signals with 2nd SP
`Target gain for the
`selected antenna is used
`for all RF/IF chains.
`
`Select an antenna
`with maximum
`power.
`
`1st SP
`
`2nd SP
`
`Rx 1
`
`Rx 2
`
`Rx 3
`
`Rx 4
`
`1st AGC
`
`2nd AGC
`Base-band transmit signals (In-phase)
`Slide 6
`
`Submission
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000006
`
`
`
`January 2004
`
`doc.: IEEE 802.11-04/046r1
`
`Distribution of the received power for data part and
`1st /2nd SP part in channel model C(NLOS)
`3 by 3 MIMO-system
`
`’bunnpu_sp2.data’
`
`Normalized received power for data
`
`1.5
`
`2
`
`1
`
`0.5
`
`3.5
`
`3
`
`2.5
`
`Saturation
`
`’bunnpu_sp0.data’
`
`Quantization error
`
`0.5
`
`1
`
`1.5
`
`2
`
`2.5
`
`3
`
`3.5
`
`Normalized received power of SP
`(conventional preamble)
`
`0
`
`0
`
`0.5
`
`1
`
`1.5
`
`2
`
`2.5
`
`3
`
`3.5
`
`Normalized received power of 2nd SP
`(new preamble)
`
`3.5
`
`3
`
`2.5
`
`2
`
`1.5
`
`1
`
`0.5
`
`Normalized received power for data
`
`0
`
`0
`
`Submission
`
`This figure shows the power of antenna with maximum power in SP(2nd SP)
`Slide 7
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000007
`
`
`
`January 2004
`
`doc.: IEEE 802.11-04/046r1
`
`Simulation parameters
`
`Architecture
`Antenna element
`Modulation and coding scheme
`Channel model
`IF/RF impairment
`Synchronization (Timing sync.
`Frequency sync.)
`Channel estimation
`MIMO detection algorithms
`DATA length
`ADC
`AGC
`
`IEEE802.11a-based MIMO-OFDM
`ULA (half a wavelength spacing)
`54Mbps(64QAM, R=3/4)
`TGn Channel model (03/940)
`Ignored
`Ideal
`
`Ideal
`MMSE-BLAST(MMSE-based OSIC)
`1000 Bytes for each stream
`10bit-ADC
`Common gain AGC
`(power measurement is ideal)
`
`Submission
`
`Slide 8
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000008
`
`
`
`January 2004
`doc.: IEEE 802.11-04/046r1
`BER/PER performance vs. average amplitude of SP in
`channel model B(NLOS)
`PSDU=1000bytes for each,10bit-ADC
`
`Submission
`
`Slide 9
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000009
`
`
`
`January 2004
`doc.: IEEE 802.11-04/046r1
`BER/PER performance vs. average amplitude of SP in
`channel model C(NLOS)
`PSDU=1000bytes for each,10bit-ADC
`
`Submission
`
`Slide 10
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000010
`
`
`
`January 2004
`doc.: IEEE 802.11-04/046r1
`BER/PER performance vs. average amplitude of SP in
`channel model D(NLOS)
`PSDU=1000bytes for each,10bit-ADC
`
`Submission
`
`Slide 11
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000011
`
`
`
`January 2004
`doc.: IEEE 802.11-04/046r1
`BER/PER performance vs. average amplitude of SP in
`channel model E(NLOS)
`PSDU=1000bytes for each,10bit-ADC
`
`Submission
`
`Slide 12
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000012
`
`
`
`January 2004
`
`doc.: IEEE 802.11-04/046r1
`
`Conclusions
`
`A new preamble structure with 2nd SP has
`been examined.
`
`The new SP is less demanding on the
`dynamic range of the AGC.
`
`For a given AGC dynamic range, BER
`/PER performance is improved.
`
`Submission
`
`Slide 13
`
`Tsuguhide Aoki, TOSHIBA
`
`HUAWEI EXHIBIT 1008
`HUAWEI VS. SPH
`
`000013
`
`
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