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Design Notes


According to ETSI TS 125 141 V7.11.0 (2008-04) Technical Specification

- 6.6  Transmit Intermodulation

Results are displayed in Third Order Intermodulation Products and Fifth Order Intermodulation Products graphs.  WCDMA power and center frequency offsets are set through variables WCDMA_PwrLvlOff_dB and WCDMA_FcOffset_MHz in Global Definitions.  Power level offset should be set to 30 dB.  Center frequency offset should be set to 5 MHz and -5 MHz. 

For WCDMA center frequency offset of 5 MHz, the Adj. Ch. Offset parameter in the ACPR measurements should be set to:

            Third order:  10 MHz and -5 MHz

            Fifth order:  15 MHz and -10 MHz

For offset of -5 MHz, the Adj. Ch. Offset parameter should be set to:

            Third order:  5 MHz and -10 MHz

            Fifth order:  10 MHz and -15 MHz


WCDMA/HSDPA TX Conformance Testing

According to 3GPP TS 25.141 V6.10.0

Test Models for TX conformance testing are selected through TestModel parameter in Global Definitions.  Multiple channel configurations available for some of the tests are selected by the ChannelConfig parameter.  In case of invalid entries, these parameters are rounded to the nearest valid value.

The rated output power, PRAT, of the base station is set by OutPowerLevel_dBm.  The nominal values are specified as follows:

The center frequency is specified by CarrierFreq_MHz. Its value should be set according to the values specified in Section 3.4 of the specification document.

Test Model configurations are specified in the tables below:

System Diagram - WCDMA_HSDPA_TestModels

Graph - Third Order Intermodulation Products

Power (dBm) DB(ACPR(VSA.M2,1852.5,3,3.84,3,10,3,3.84,3,1,0,1,0,0,1000,0,10,0,-1,0,-1,1,0.22,0,1,0)) WCDMA_HSDPA_TestModels DB(ACPR(VSA.M2,1852.5,3,3.84,3,-5,3,3.84,3,1,0,1,0,0,1000,0,10,0,-1,0,-1,1,0.22,0,1,0)) WCDMA_HSDPA_TestModels
-0.132853 -62.6161 -43.7465

Graph - Fifth Order Intermodulation Products

Power (dBm) DB(ACPR(VSA.M2,1852.5,3,3.84,3,15,3,3.84,3,1,0,1,0,0,1000,0,10,0,-1,0,-1,1,0.22,0,1,0)) WCDMA_HSDPA_TestModels DB(ACPR(VSA.M2,1852.5,3,3.84,3,-10,3,3.84,3,1,0,1,0,0,1000,0,10,0,-1,0,-1,1,0.22,0,1,0)) WCDMA_HSDPA_TestModels
-0.132853 -72.8475 -62.9762

Graph - Spectrum