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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.

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 - BER

Graph - Spectrum