Agilent Technologies N9010A - Manual (Page 270)

270 Chapter 30
LTE Measurement Application
Measurements
Description Specifications Supplemental Information
Modulation Analysis % and dB expressions
a
(Signal level within one range
step of overload)
OSTP/RSTP
Absolute accuracy
b ±0.30 dB (nominal)
EVM Floor
c
for Downlink
(OFDMA)
Signal Bandwidth
5 MHz 1.35% (
−37.3 dB) 0.56% (−45 dB) (nominal)
10 MHz 1.35% (
−37.3 dB) 0.63% (−44 dB) (nominal)
20 MHz
d
1.35% (
−37.3 dB) 0.63% (−44 dB) (nominal)
EVM Accuracy for Downlink
(OFDMA)
(EVM range: 0 to 8%)
e ±0.3% (nominal)
EVM Floor
c
for
Uplink (SC-FDMA)
Signal Bandwidth
5 MHz 1.35% (
−37.3 dB) 0.56% (−45 dB) (nominal)
10 MHz 1.35% (
−37.3 dB) 0.56% (−45 dB) (nominal)
20 MHz
d
1.35% (
−37.3 dB) 0.56% (−45 dB) (nominal)
Frequency Error
Lock range ±2.5
× subcarrier spacing = 37.5 kHz for
default 15 kHz subcarrier spacing (nominal)
Accuracy ±1 Hz + tfa
f
(nominal)
Time Offset
g
Absolute frame offset accuracy ±20 ns
Relative frame offset accuracy ±5 ns (nominal)
MIMO RS timing accuracy ±5 ns (nominal)
a. In these specifications, those values with % units are the specifications, while those with decibel units,
in parentheses, are conversions from the percentage units to decibels for reader convenience.
b. The accuracy specification applies when EVM is less than 1% and no boost applies for the ref-
erence signal.
c. Overall EVM and Data EVM using 3GPP standard-defined calculation. Phase Noise Optimization set
to Best Close-in (<20 kHz).
d. Requires Option B25 or B40 (IF bandwidth above 10 MHz, up to 40 MHz).
e. The accuracy specification applies when the EVM to be measured is well above the measurement floor.
When the EVM does not greatly exceed the floor, the errors due to the floor add to the accuracy errors.
The errors due to the floor are noise-like and add incoherently with the UUT EVM. The errors depend
on the EVM of the UUT and the floor as follows:
error = [sqrt(EVMUUT
2
+ EVMsa
2
)] –EVMUUT
where EVMUUT is the EVM of the UUT in percent, and EVMsa is the EVM floor of the analyzer in
percent.