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Design Notes

WCDMA/HSDPA RX Blocking Characteristics Test:

This project implements the RX Blocking Characteristics Test according to ETSI TS 125 141 V6.11.0 (2005-09) Technical Specification, defined in Section 7.5. 

For this test, the TX transmits an uplink DPCH signal with 12.2 kbps data rate. Blocking signal is generated as either a WCDMA source or a CW source and is combined with the signal of interest. Center frequency of the interfering signal depends on the operating frequency band and is defined in Tables 7.4x. For each base-station (BS) class, a bit-error-rate (BER) of 0.001 should be achieved for the signal and interference levels defined in Tables 7.4x. As an example, signal and interference parameters for Operating Band I are shown below:

                                                Signal level           WCDMA level       CW level

Wide Area BS:                        -115 dBm              -40 dBm        -15 dBm

Medium Range BS:               -105 dBm              -35 dBm        -15 dBm

Local Area BS:                       -101 dBm              -30 dBm        -15 dBm

The WCDMA interferer will have a 10 MHz minimum offset, while the CW interferer will have a 20 MHz minimum offset.

The frequency offset of the interferers may be modified through variables WCDMA_FcOffset_MHz and CW_FcOffset_MHz.

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)

WCDMA_FcOffset_MHz:   Carrier frequency offset of WCDMA interfering source

CW_FcOffset_MHz:            Carrier frequency offset of CW interfering source

CW_PwrLvl_dBm:               Power level of CW interfering source

System Diagram - RX Sensitivity Performance

Graph - Spectrum

Graph - BER