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Design Notes

WCDMA and GSM signals combined to cause interference in GPS frequency band

This project demonstrates:

1.   The use of the Change Sampling Frequency (CHANGE_FS) block. CHANGE_FS is used to combine two signals of different sampling frequencies. This block is useful to use when there is no common integer multiple of the data rates of interest.

2.   The use of the COMBINER’s PRIMINP parameter. Note that, in this case the PRIMINP parameter is set to node 1. This ensures that the center frequency used by the spectrum plot is set to that of the GSM/EDGE source. If this parameter is left blank or set to node 2, then the resulting spectrums will be centered on the frequency of the WCDMA source.

The TX antenna sends out a signal at a particular EIRP depending on its parameter settings. The RX antenna generates the RX signal power at the front end of the RX link depending on its parameter settings. The filter characteristics and/or AMP_B's parameters can be changed to increase or decrease the level of the interfering signal at 1576MHz.

System Diagram - WCDMA and GSM to create interfering signal in GPS frequency band

Graph - Spectrum