1. Requirements for Alternate Channelization in TGj
January 2003
doc.: IEEE /114r0
January 2003
Requirements for Alternate Channelization in TGj
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Sheung Li, Atheros
Sheung Li, Atheros

2. Channel Allocation January 2003 doc.: IEEE 802.11-03/114r0
20 MHz Example
Center Channels:
20MHz System: 4920MHz, 4940MHz, 4960MHz, 4980MHz, 5040MHz, 5060MHz, 5080MHz
10MHz System: 4915MHz, 4920MHz, 4925MHz, 4935MHz, 4940MHz, 4945MHz,
5035MHz, 5040MHz, 5045MHz, 5055MHz
5MHz System: MHz, Hz, MHz, MHz, MHz, MHz, MHz, MHz,
5032.5MHz, MHz, MHz, MHz, MHz, MHz
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Sheung Li, Atheros

3. Transmit Mask Issues (Inband)
January 2003
doc.: IEEE /114r0
January 2003
Transmit Mask Issues (Inband)
20 MHz Example
Inband (STA)
Inband (AP)
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Sheung Li, Atheros

4. Transmit Mask Issues (OOB)
January 2003
doc.: IEEE /114r0
January 2003
Transmit Mask Issues (OOB)
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Sheung Li, Atheros

5. Spurious Leakage January 2003 doc.: IEEE 802.11-03/114r0 January 2003
Sheung Li, Atheros
Sheung Li, Atheros

6. System Sharing January 2003 doc.: IEEE 802.11-03/114r0 January 2003
Sheung Li, Atheros
Sheung Li, Atheros

7. Receive Sensitivity Same as 802.11a for 20 MHz channelization
January 2003
doc.: IEEE /114r0
January 2003
Receive Sensitivity
Same as a for 20 MHz channelization
Same for 10 MHz and 5 MHz channelizations of same protocol
Doubling timing by halving or quartering clock increases by 3 dB
Halving or quartering carrier widths decreases by 3 dB
Sheung Li, Atheros
Sheung Li, Atheros

8. Blocker Performance Lesson from ASTM E17.51 Proceedings
January 2003
Blocker Performance
Lesson from ASTM E17.51 Proceedings
Different indoor and outdoor applications have different requirements
Tx Pwr from 1mW to 250mW or more
Tx Distance from 1m to 500m or more
Physical Separation varies from co-located arrays to many km’s.
Recommend provide for different levels of relative adjacent/alternate channel rejection from current
Type 1: -6dB, Type 2: -3dB
Type 3: +0dB
Type 4: +3dB, Type 5: + 6dB
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9. Timing Differences January 2003 (us) 20 MHz 10 MHz 5 MHz
IFFT/FFT Period
3.2
6.4
12.8
GI Duration
0.8
1.6
Training Symbol GI Duration
Duration, Interval of Symbol 4 8 16
PLCP Preamble,
Training Sequence Duration 32 64
SIFS Time
Slot Time 9 18 36
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10. Differences By Channelization
January 2003
Differences By Channelization
20 MHz
10 MHz
5 MHz
Data Rates
6,9,12,18, 24,36,48,54
3,4.5,6,9, 12,18,24,27
1.5,2.25,3,4.5, 6,9,12,13.5
Tx Constellation Error (dB)
-5 to -25
same
CCA Sensitivity Meas. Period (us) 4 8 16
MIB and PICs
as above
PWR Levels
as in TGh
Information Elements OK
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Use new IE to designate
Sheung Li, Atheros