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Design Notes

WCDMA/HSDPA RX Adjacent Channel Selectivity Test:

This project implements the RX Adjacent Channel Selectivity Test according to ETSI TS 125 141 V6.11.0 (2005-09) Technical Specification, defined in Section 7.4. 

For this test, the TX transmits an uplink 12.2 kbps DPCH signal. An adjacent channel WCDMA source, defined in Annex A and at a frequency offset by 5 MHz, is combined with the signal of interest. For each base-station (BS) class, a bit-error-rate (BER) of 0.001 should be achieved for signal and interference levels defined in Table 7.3 and shown below:

                                              Signal level                  Interference level

Wide Area BS:                        -115 dBm                          -52 dbm

Medium Range BS:               -105 dBm                          -42 dbm

Local Area BS:                       -101 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 - BER

Graph - Spectrum