The Clause 7 characteristic tests vary in the number of signals used for each test. Each signal type requires the use of a separate signal generator (see W-CDMA Tests). This is shown in the setup figures contained in this topic. In a test setup where only one instrument is being used (one signal), ignore the instrument setup for second and third signal generator, and connect the first signal generator directly to the BTS receive port (a termination on the unused ports may be required). When using a multiple instrument setup (two or three instruments), refer to the 3GPP standard TS 25.141, Clause 7 tests to complete the connection from the signal generator RF Output to the BTS receive port.
After setting up the instruments, refer to the tutorial for configuring the test using the Test Case Manager software.
If a CW interferer is required, ensure that the CW interferer signal generator is the last instrument in the chain.
Ensure that the test signal amplitudes account for loss due to cables, connections, and combiner. To compensate for these losses, see the Configuring the Signal Generator tutorial.
The CW interferer can use the shown EXG/MXG or ESG signal generators for frequencies that are 6 GHz or less, or it can use the N5183A MXG or N8257D PSG microwave signal generators for all frequency ranges (less than and greater than 6 GHz). For more information, refer to the System Requirements.
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Signal Generator 1 |
Wanted signal |
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Signal Generator 2 |
Interferer (W-CDMA or GMSK ) or the CW interferer when it is the only remaining interferer |
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Signal Generator 3 |
CW interferer signal |
The PXB cannot generate a CW interferer. But if the software is running on the PXB, it can send the commands to the signal generator (MXG/EXG/ESG 3 in the figure) for it to generate the CW interferer.
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MXG/EXG/ESG 1 |
Wanted signal |
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MXG/EXG/ESG 2 |
Interferer (W-CDMA or GMSK ) |
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MXG/EXG/ESG 3 |
CW interferer signal—the figure assumes that the software is running on the PXB, but if it is running on a separate PC, then the LAN/GPIB connection would be to the same network as the PC The CW interferer is also supported using the N5183A MXG or E8257D PSG microwave signal generators for all frequency ranges (less than and greater than 6 GHz). For more information, refer to the System Requirements. |
