Filter
Top Products
188 Chapter 15
TD-SCDMA Measurement Application
Measurements
Test signal with TS0 active and one
HS-PDSCH in TS0
±6 Hz + tfa (nominal)
a. ML (mixer level) is RF input power minus attenuation.
b. The EVM floor is derived for signal power −20 dBm. The signal has only 1 DPCH or HS-PDSCH in
TS0.
c. 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(EVMUUT2 + EVMsa2)] − EVMUUT,
where EVMUUT is the EVM of the UUT in percent, and EVMsa is the EVM floor of the analyzer in
percent. For example, if the EVM of the UUT is 7%, and the floor is 2.5%, the error due to the floor is
0.43%.
d. The accuracy is derived in the EVM range 0 ~ 18%. We choose the maximum EVM variance in the
results as the accuracy.
e. This specifies a synchronization range with Midamble.
f. tfa = transmitter frequency x frequency reference accuracy
Description Specification Supplemental Information