doc.: ieee 802.11-00/393 submission november 2000 paul chiuchiolo and mark webster, intersilslide 1...
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doc.: IEEE /393 Submission November 2000 Paul Chiuchiolo and Mark Webster, IntersilSlide 3 RAPP Power Amplifier (PA) Model (Amplitude out/in)TRANSCRIPT
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 1
doc.: IEEE 802.11-00/393
Submission
Power Amp Effects for HRb OFDMPaul Chiuchiolo and Mark Webster
Intersil Corporation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 2
doc.: IEEE 802.11-00/393
Submission
Non-Ideal PA Effects for OFDM• Spectral characteristics of PA input/output
– BPSK, QPSK, 16-QAM, 64-QAM– Over-sample rate of 4x– Pulse shaping requirements same as 802.11a
• PER with PA– PA Output Backoff
• Backoff from full saturation– RAPP model used with p=2 and 3
• Good approximation of existing amplifiers– 6.6, 13.2, 26.4 and 59.4 Mbps, 1000 bytes – Oversample rate of 4x– Estimate subcarrier amp/phz over packet (non-ideal)
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 3
doc.: IEEE 802.11-00/393
Submission
RAPP Power Amplifier (PA) Model (Amplitude out/in)
1
2 2
( )1 p p
Ag AA
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 4
doc.: IEEE 802.11-00/393
Submission
RAPP Power Amplifier (PA) Model (dB out/in)
1
2 2
( )1 p p
Ag AA
Output fromFull Saturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 5
doc.: IEEE 802.11-00/393
Submission
1 dB Compression Point 1 dB Compression Point vs. Full Saturationvs. Full Saturation
-10
-9
-8
-7
-6
-5
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-3
-2
-1
01 2 3 4 5 6 7 8 9 10
"p" parameter
Out
put P
ower
(dB
)
Output Power at 1dB CompressionPointSaturation Point
Where is 1 dB Compression Point?P=2: 2 dB from Full SaturationP=3: 1 dB from Full Saturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 6
doc.: IEEE 802.11-00/393
Submission
PA Back-off for 802.11b802.11 DSSS Barker
802.11b mask
PA: Rapp Modelp = 2
Must Back-off PA 3.7 dB from full saturation tomeet spectral mask.
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 7
doc.: IEEE 802.11-00/393
Submission
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-140
-120
-100
-80
-60
-40
-20
0
freq
dBPA Input 4x for BPSK
PSD for PA Input with BPSK Subcarriers
Equivalent802.11amask
11 MHz
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 8
doc.: IEEE 802.11-00/393
Submission
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
freq
dBPA Output 4x for BPSK with p=2
PSD for PA Output with BPSK Subcarriers
backoff=16.0dB
backoff=3.7dB
backoff=4.7dB
backoff=8.2dB
backoff=12.0dB
P = 2
Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 9
doc.: IEEE 802.11-00/393
Submission
PSD for PA Output with BPSK Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
freq
dBPA Output 4x for BPSK with p=3
backoff=16.0dB
backoff=3.4dB
backoff=4.6dB
backoff=8.1dB
backoff=12.0dB
P = 3
Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 10
doc.: IEEE 802.11-00/393
Submission
PSD for PA Input with QPSK Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-140
-120
-100
-80
-60
-40
-20
0
freq
dBPA Input 4x for QPSK
Equivalent802.11amask
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 11
doc.: IEEE 802.11-00/393
Submission
PSD for PA Output with QPSK Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
freq
dBPA Output 4x for QPSK with p=2
backoff=16.0dB
backoff=3.7dB
backoff=4.7dB
backoff=8.2dB
backoff=12.0dB
P = 2Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 12
doc.: IEEE 802.11-00/393
Submission
PSD for PA Output with QPSK Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
freq
dBPA Output 4x for QPSK with p=3
backoff=16.0dB
backoff=3.4dB
backoff=4.6dB
backoff=8.1dB
backoff=12.0dB
P = 3
Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 13
doc.: IEEE 802.11-00/393
Submission
PSD for PA Input with 16-QAM Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-140
-120
-100
-80
-60
-40
-20
0
freq
dBPA Input 4x for 16-QAM
Equivalent802.11amask
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 14
doc.: IEEE 802.11-00/393
Submission
PSD for PA Output with 16-QAM Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
freq
dBPA Output 4x for 16-QAM with p=2
backoff=16.0dB
backoff=3.7dB
backoff=4.7dB
backoff=8.2dB
backoff=12.0dB
P = 2
Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 15
doc.: IEEE 802.11-00/393
Submission
PSD for PA Output with 16-QAM Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
freq
dBPA Output 4x for 16-QAM with p=3
backoff=16.0dB
backoff=3.4dB
backoff=4.6dB
backoff=8.1dB
backoff=12.0dB
P = 3
Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 16
doc.: IEEE 802.11-00/393
Submission
PSD for PA Input with 64-QAM Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-140
-120
-100
-80
-60
-40
-20
0
freq
dBPA Input 4x for 64-QAM
Equivalent802.11amask
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 17
doc.: IEEE 802.11-00/393
Submission
PSD for PA Output with 64-QAM Subcarriers
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
freq
dBPA Output 4x for 64-QAM with p=2
backoff=16.0dB
backoff=3.7dB
backoff=4.7dB
backoff=8.2dB
backoff=12.0dB
P = 2
Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 18
doc.: IEEE 802.11-00/393
Submission
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
freq
dBPA Output 4x for 64-QAM with p=3
PSD for PA Output with 64-QAM Subcarriers
backoff=16.0dB
backoff=3.4dB
backoff=4.6dB
backoff=8.1dB
backoff=12.0dB
P = 3
Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 19
doc.: IEEE 802.11-00/393
Submission
3 3.5 4 4.5 5 5.5 6 6.5 710
-4
10-3
10-2
10-1
100PER vs. Eb/No for 6.6 Mbps using Rapp (p=2) model
Eb/No (dB)
PE
R
no PA backoff=3.7dBbackoff=4.7dBbackoff=6.4dB
PER for 6.6 Mbps with p=2
Backoff from full saturation.
1000 bytePackets
Backoff from FullSaturation
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 20
doc.: IEEE 802.11-00/393
Submission
3 3.5 4 4.5 5 5.5 6 6.5 710
-4
10-3
10-2
10-1
100PER vs. Eb/No for 6.6 Mbps using Rapp (p=3) model
Eb/No (dB)
PE
R
no PA backoff=3.4dBbackoff=4.6dBbackoff=6.3dB
PER for 6.6 Mbps with p=3
Backoff from full saturation.
Backoff from FullSaturation1000 byte
Packets
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 21
doc.: IEEE 802.11-00/393
Submission
PER for 13.2 Mbps with p=2
3 3.5 4 4.5 5 5.5 6 6.5 710
-4
10-3
10-2
10-1
100PER vs. Eb/No for 13.2 Mbps using Rapp (p=2) model
Eb/No (dB)
PE
R
no PA backoff=3.7dBbackoff=4.7dBbackoff=6.4dBbackoff=8.2dB
Backoff from FullSaturation1000 byte
Packets
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 22
doc.: IEEE 802.11-00/393
Submission
PER for 13.2 Mbps with p=3
2 3 4 5 6 710
-4
10-3
10-2
10-1
100PER vs. Eb/No for 13.2 Mbps using Rapp (p=3) model
Eb/No (dB)
PE
R
no PA backoff=3.4dBbackoff=4.6dBbackoff=6.3dBbackoff=8.1dB
Backoff from FullSaturation1000 byte
Packets
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 23
doc.: IEEE 802.11-00/393
Submission
PER for 26.4 Mbps with p=2
5 6 7 8 9 10 1110
-4
10-3
10-2
10-1
100PER vs. Eb/No for 26.4 Mbps using Rapp (p=2) model
Eb/No (dB)
PE
R
no PA backoff=3.7dB backoff=4.7dB backoff=6.4dB backoff=8.2dB backoff=10.1dBbackoff=12.0dB
Backoff from FullSaturation1000 byte
Packets
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 24
doc.: IEEE 802.11-00/393
Submission
PER for 26.4 Mbps with p=3
5 6 7 8 9 10 1110
-4
10-3
10-2
10-1
100PER vs. Eb/No for 26.4 Mbps using Rapp (p=3) model
Eb/No (dB)
PE
R
no PA backoff=3.4dB backoff=4.6dB backoff=6.3dB backoff=8.1dB backoff=10.0dBbackoff=12.0dB
Backoff from FullSaturation1000 byte
Packets
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 25
doc.: IEEE 802.11-00/393
Submission
PER for 59.4 Mbps with p=2
10 11 12 13 14 15 16 17 1810
-4
10-3
10-2
10-1
100PER vs. Eb/No for 59.4 Mbps using Rapp (p=2) model
Eb/No (dB)
PE
R
no PA backoff=4.7dB backoff=6.4dB backoff=8.2dB backoff=10.1dBbackoff=12.0dB
Backoff from FullSaturation1000 byte
Packets
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 26
doc.: IEEE 802.11-00/393
Submission
PER for 59.4 Mbps with p=3
10 11 12 13 14 15 16 17 1810
-4
10-3
10-2
10-1
100PER vs. Eb/No for 59.4 Mbps using Rapp (p=3) model
Eb/No (dB)
PE
R
no PA backoff=4.6dB backoff=6.3dB backoff=8.1dB backoff=10.0dBbackoff=12.0dB
Backoff from FullSaturation1000 byte
Packets
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 27
doc.: IEEE 802.11-00/393
Submission
SNR Degradation TableData Rate (Mbps)
6.613.226.459.4
Data Rate (Mbps)6.613.226.459.4
* Required to meet spectral mask.
0.5 0.2
3.4*3.4*6.38.1
Required Backoff (dB) 1% PER 10% PER0.5 0.4
0.5
0.2 0.1
SNR Degradation (dB) for p=3
0.4 0.3
0.40.2
0.90.30.5
1% PER
0.5
Required Backoff (dB)3.7*3.7*6.48.2
10% PER0.4
SNR Degradation (dB) for p=2
1000 bytePackets
November 2000
Paul Chiuchiolo and Mark Webster, IntersilSlide 28
doc.: IEEE 802.11-00/393
Submission
Conclusions
• At the lower data rates up to 13.2 Mbps, PA back-off is the same as 802.11b.
• Back-off PA more at higher data rates.• P=3 is slightly better than p=2.• OFDM is competitive