R&S FSL WiMAX, WiBro Measurements (Options K92/K93)
1300.2519.12 2.149 E-11
2
1
00
)
0(
1
00
200
1
k
k
k
EVMEVM
%
&
=
=
(34)
is derived by averaging the squared
k
EVM versus k . Finally the average error vector magnitude
)(
2
_
1
_
1
counterEVMEVM
p
acketsnof
c
ounter
packetsnof
%
=
=
(35)
is calculated by averaging the packet
EVM
of all
packetsnof _
detected packets. This parameter is
equivalent to the so–called "RMS average of all errors
RMS
Error '' of the IEEE 802.16–2004
measurement commandment (see [6], Chapter 8.3.10.1.2).
Analysis Steps
Preamble related result Remark
Rough frequency estimation In case of subchannelization, a rough frequency estimation is obtained by
exploiting the cyclic prefix of the OFDM symbols.
Preamble power
Preamble EVM Uses payload channel estimation for equalization.
Frequency error vs. preamble
Phase error vs. preamble
Channel estimation Used for equalizing
Payload related result Remark
Fine frequency estimation Estimation on pilots used for phase correction if 'Phase Tracking' is
selected. Phase tracking needs at least one pilot.
In case of subchannelization, the value shown in the result summary table
is estimated on pilots and data.
Clock offset estimation Estimation on pilots used for timing correction if 'Timing Tracking' is
selected. Timing tracking needs at least two pilots.
In case of subchannelization, the value shown in the result summary table
is estimated on pilots and data.
IQ Offset Power at spectral line 0 normalized to the total transmitted power.
Gain Imbalance Estimation not available in case of subchannelization.
Quadrature Error Estimation not available in case of subchannelization.
Payload channel estimation Combined with the preamble channel estimation.
Burst related result Remark
EVM All carriers
EVM Data carriers
EVM Pilot carriers
According to standard normalized to the average power of all 200 used
carriers.
Burst Power
Crest Factor
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