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Design Notes

WCDMA/HSDPA RX Intermodulation Test:

This project implements the RX Intermodulation Test according to ETSI TS 125 141 V6.11.0 (2005-09) Technical Specification, defined in Section 7.6. 

For this test, the TX transmits an uplink DPCH signal with 12.2 kbps data rate. Intermodulation signals are a WCDMA source offset by 20 MHz and a CW source offset by 10 MHz, with power levels defined below. For each base-station (BS) class, a bit-error-rate (BER) of 0.001 should be achieved for signal levels defined in Section 7.6.1 and shown below:

                                                Signal level           WCDMA level       CW level

Wide Area BS:                        -115 dBm             -48 dBm          -48 dBm

Medium Range BS:               -105 dBm             -44 dBm          -44 dBm

Local Area BS:                       -101 dBm             -38 dBm          -38 dBm

Two system diagrams are provided for the TX and RX DUT implementations.  User can implement their own designs inside these system diagrams.


When the measured BER is 0, no points will be displayed on the BER graph. The BER_EXT block in the RX Sensitivity Performance system diagram creates a pop-up window when simulation starts, where tral statistics are displayed. Sometime this window starts either minimized or very smal - in this case, increase the size of this window to monitor the trial statistics.

Test Configuration:

The test may be cofigured by setting appropriate parameters in the Global Definitions window.  These parameters, which are boxed for easy access, are:

CenterFrq_MHz:                  Center Frequency

SigLevel_relStart: Start Signal Level relative to nominal signal level

SigLevel_span:                    Span of Signal Levels

SigLevel_step:                     Step of Signal Levels

MinNumErrsCollect:            Minimum Number of Errors to collect for each signal level

MaxNumBlockRun:             Maximum number of blocks to run for each signal level

BS_Type:                              BS type (0 = Wide area, 1 = Medium range, 2 = Local area)

System Diagram - RX Sensitivity Performance

Graph - Spectrum

Graph - BER