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2.6.2
Spectral flatness
The transmit spectral flatness will conform the 802.11n draft as specified in section 20.3.20.2.
In a 20 MHz channel and in corresponding 20 MHz transmission in a 40 MHz channel, the average energy of the
constellations in each of the spectral lines –16 to –1 and +1 to +16 shall deviate no more than ± 2 dB from their
average energy. The average energy of the constellations in each of the spectral lines –28 to –17 and +17 to +28
shall deviate no more than +2/–4 dB from the average energy of spectral lines –16 to –1 and +1 to +16.
In a 40 MHz transmission (excluding HT duplicate format and non-HT duplicate format) the average energy of the
constellations in each of the spectral lines –42 to –2 and +2 to +42 shall deviate no more than ± 2 dB from their
average energy. The average energy of the constellations in each of the spectral lines –43 to –58 and +43 to +58
shall deviate no more than +2/–4 dB from the average energy of spectral lines –42 to –2 and +2 to +42.
2.6.3
Transmit power range and accuracy
This radio will have an adjustable output power range from +4dBm to +28dBm in 0.5 dB step. Per Atheros radio
calibration procedure as well as per base band chipset design, this radio shall be designed to maintain an average
transmit power accuracy of +/-2dB per antenna.
The method for determining the average transmitted power accuracy is calculated as follows:
When the ideal transmitted power is set by software, the output RF power of the radio is measured simultaneously
by the MIMO Litepoint Iqnxn test set (or equivalent) for a given data rate on all channels, all frequency bands. The
actual measured output power is subtracted from the ideal settings to obtain the errors for each level. The errors at
each level are then averaged over all channels in the given band. This calculation shall be performed for each
transmit chain.
2.6.4
Transmit center frequency tolerance
The transmitter center frequency tolerance shall be ±20 ppm maximum.
2.6.5
RX Symbol clock frequency tolerance
This table below lists the minimum requirements for the radio by the IEEE standard. The actual radio shall be able
to accommodate +/- 50ppm.
Mode Of Operation
802.11a
802.11b
802.11g
2.6.6
Modulation accuracy (EVM), DSSS rates
Modulation accuracy shall meet the minimum requirements by IEEE 802.11 draft 2.0.
The following table lists the EVM requirements for direct sequence spread spectrum data rates which use 802.11b
waveforms:
IEEE Stability Requirements
+/-20ppm frequency stability vs. temperature and aging.
+/-25ppm frequency stability vs. temperature and aging.
+/-25ppm frequency stability vs. temperature and aging.
Figure 8-Symbol clock frequency tolerance
Data rate (Mbps)
1
For Internal Use Only - Do Not Duplicate
Copyright (c) 2009 by Motorola
CONFIDENTIAL AND PROPRIETARY
EVM (minimum)
35%
Radio spec (min)
+/- 40ppm
+/-50ppm
+/-50ppm
10
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