Rohde & Schwarz CMW-KM750, User Manual

Page: 20 / 152

General Description
R&S
®
CMW-KM750/-KM751
20 User Manual 1173.9670.02 ─ 05
3.5 Limit Settings and Conformance Requirements
Conformance requirements for TD-SCDMA transmitter tests are specified in 3GPP TS
34.122, section 5, "Transmitter Characteristics".
The following sections give an overview of the R&S CMW limit settings and the related
test requirements.
● Transmit Modulation Limits .....................................................................................20
● Power Templates ....................................................................................................21
● ACLR Limits ............................................................................................................22
● Spectrum Emission Mask ........................................................................................23
3.5.1 Transmit Modulation Limits
A poor modulation accuracy of the UE transmitter increases the transmission errors in
the uplink channel of the TD-SCDMA network. The Error Vector Magnitude (EVM) is the
critical quantity to assess the modulation accuracy of a TD-SCDMA UE.
According to 3GPP, the EVM measured at UE output powers
≥ −
20 dBm and under
normal operating conditions shall not exceed 17.5 %. In addition, the Peak Code Domain
Error, which is the maximum EVM of all code channels, shall not exceed –20 dB. The
frequency error shall not exceed ±0.1 ppm. These limits can be set in the configuration
dialog, along with limits for the other measured quantities.
Limit Settings and Conformance Requirements