CDMA2000 Measurements
R&S
®
CMW-KM8xx/-KS8xx
732
User Manual 1173.9511.02 ─ 12
Fig. 5-4: Modulation limit settings
5.2.6.2
Code Domain Limits
Whether or not a code channel is considered inactive and a limit check is performed
depends on the I/Q leakage check:
●
Leakage check not active (conform to 3GPP2): A code channel is considered inac-
tive if both I-branch and Q-branch of the channel are inactive. If at least one branch
is active, no limit check is performed.
●
Leakage check active: A code channel is considered inactive if at least one branch
(I or Q) is inactive. In that case a limit check is performed for the inactive branch /
branches.
The code domain power (CDP) is defined relative to the total power of the signal, so
none of the individual CDP contributions can be larger than 0 dB. Minimum require-
ments for the code domain power are defined in 3GPP2 C.S0011, section 4.3.5, "Code
Domain Power". The I and Q components of the code domain power of an inactive
channel shall be at least 23 dB below the total output power.
The EVM does not provide a measure of how error power is distributed among code
channels. A measure of the code domain distribution of error power is provided by the
CDP of the error signal. This gives rise to the concept of a code domain error (CDE)
limit, where the relative power in the error must not exceed a certain value in any of the
inactive code channels. See 3GPP2 C.S0011, section 6.4.2.2.6, "Power in Undesired
Channels".
Channel power limits are similar to code domain power limits, but apply to named
CDMA2000 channels only. Channel Phase/Time Offset is the phase/timing error
between the Reverse Pilot Channel and the other code channels radiated by the
mobile station.
The limits can be set in the configuration dialog. The checkboxes activate/deactivate
the limit checks. The leakage check can also be activated/deactivated.
General Description
深圳德标仪器
135-1095-0799
