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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.

Note:

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