WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
149
User Manual 1173.9657.02 ─ 11
If the dual carrier scenario is active, you can configure the output power per carrier.
The total power of both carriers is also displayed. If you modify it, both carrier powers
are increased/decreased by the same amount so that the new total power is reached.
Remote command:
AWGN Noise (Ioc) ← RF Power Downlink
Total level of the Additional White Gaussian Noise (AWGN) interferer in dBm (the
spectral density integrated across the bandwidth of 3.84 MHz). The signaling unit adds
the AWGN signal to the DL WCDMA signal unless AWGN is switched off. Like the out-
put channel power, the AWGN level is varied as a function of the external output
attenuation setting.
The range of values is sufficient for all tests specified in the conformance test specifi-
cation 3GPP TS 34.121. The properties of the AWGN interferer comply with the
requirements of 3GPP TS 34.121, section 7.1.2 (minimum bandwidth 5.76 MHz, flat-
ness less than ±0.5 dB, peak to average ratio at a probability of 0.001 % above 10 dB).
An AWGN signal source simulates realistic propagation conditions of the DL signal. It
is needed for many of the performance tests and support of RRM tests described in
3GPP TS 34.121.
The signal at the output connector is limited to the maximum level stated in the data
sheet. When the settings result in a signal exceeding this limit, the AWGN noise is
decreased automatically.
If the dual carrier scenario is active, the same settings apply to both carriers.
For fading scenarios this parameter is disabled, so that AWGN can not be added by
the signaling unit. Instead AWGN can be added by the fader (external or internal).
Option R&S CMW-KS410 required.
Remote command:
Geometric Factor (Ior/Ioc) ← RF Power Downlink
Displays the ratio of the Output Channel Power (Ior) to the AWGN Noise power (Ioc).
Together with the absolute output channel power, the geometric factor is a measure for
the signal quality. An external output attenuation has the same effect on Ior and Ioc, so
that the geometry factor corresponds to the received channel power spectral density
Ior divided by Ioc at the UE receiver (see 3GPP TS 34.121).
If the dual carrier scenario is active, the geometric factor is displayed per carrier.
Option R&S CMW-KS410 required.
Remote command:
Total Output Power (Ior+Ioc) ← RF Power Downlink
Sum of the Output Channel Power (Ior) and the AWGN Noise power (Ioc). This value
cannot be set but is displayed for information.
GUI Reference
深圳德标仪器
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