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13 Modulation Accuracy (Composite EVM) Measurement
Meas Setup
Key Path
Meas Setup, Sync Type
Mode
WCDMA
Remote Command
[:SENSe]:RHO:SYNC[:BTS] CPICh | SCH | SYMBol | STTD | A2CPich | A1SCh |
A2SCh
[:SENSe]:RHO:SYNC[:BTS]?
Example
RHO:SYNC SCH
RHO:SYNC?
Notes
This command is effective when [:SENSe]:RADio:DEVice is set to BTS.
Couplings
SYMBol synchronizes to the code symbol specified by [:SENSe]:RHO:SYNC:SYMBol:SRATe and the
[:SENSe]:RHO:SYNC:SYMBol:SPRead commands.
Preset
CPICh
State Saved
Saved in instrument state.
Range
CPICH | SCH | Symbol Based | STTD Diff | Antenna–2 CPICH | Antenna–1 TSTD SCH | Antenna–2 TSTD
SCH
Initial S/W Revision
Prior to A.02.00
Pilot-aided Timing Estimator (BTS only)
Enables additional symbol timing estimation to each detected code channel through the demod
calculation process by referring to the pilot channel (i.e. CPICH or Ant2 CPICH, accordingly) timing
correlation. It is expected to improve symbol reference vector estimation robustness for some specific
impairment conditions: for example, the signal under test is assumed to have asymmetric filter response.
Note that this function would not always be effective to any signal condition; on the contrary, turning the
key “on” may decrease the estimation robustness and measurement speed for some different cases. A
typical example it is worth to try this out is when you find that the peak EVM result is unexpectedly high
compared to the RMS EVM result.
Key Path
Meas Setup, Sync Type, CPICH
Meas Setup, Sync Type, Antenna–2 CPICH
Mode
WCDMA
Remote Command
[:SENSe]:RHO:SYNC:CPICh:ESTimator OFF|ON|0|1
[:SENSe]:RHO:SYNC:CPICh:ESTimator?
Example
RHO:SYNC:CPIC:EST 0
RHO:SYNC:CPIC:EST?
Dependencies
This command is effective when [:SENSe]:RADio:DEVice is set to BTS and [:SENSe]:RHO:SYNC[:BTS]
is set to CPICh or A2CPich.
Preset
Off
State Saved
Saved in instrument state.
Range
On|Off
Initial S/W Revision
A.03.00
2072
W-CDMA & HSPA Measurement Applications Reference
Summary of Contents for E6640A
Page 80: ...Table of Contents lxxx W CDMA HSPA Measurement Applications Reference ...
Page 188: ...3 Programming the Test Set Common Commands 188 W CDMA HSPA Measurement Applications Reference ...
Page 256: ...5 Mode Functions Mode Setup 256 W CDMA HSPA Measurement Applications Reference ...
Page 324: ...6 System Functions System 324 W CDMA HSPA Measurement Applications Reference ...
Page 369: ...8 Channel Power Measurement Auto Couple W CDMA HSPA Measurement Applications Reference 369 ...
Page 389: ...8 Channel Power Measurement Marker W CDMA HSPA Measurement Applications Reference 389 ...
Page 664: ...9 ACP Measurement Auto Couple 664 W CDMA HSPA Measurement Applications Reference ...
Page 669: ...9 ACP Measurement BW W CDMA HSPA Measurement Applications Reference 669 ...
Page 984: ...9 ACP Measurement View Display 984 W CDMA HSPA Measurement Applications Reference ...
Page 1001: ...10 Spectrum Emission Mask Measurement W CDMA HSPA Measurement Applications Reference 1001 ...
Page 1668: ...12 Code Domain Measurement Auto Couple 1668 W CDMA HSPA Measurement Applications Reference ...
Page 2354: ...14 QPSK EVM Measurement 2354 W CDMA HSPA Measurement Applications Reference ...
Page 2364: ...14 QPSK EVM Measurement Auto Couple 2364 W CDMA HSPA Measurement Applications Reference ...