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Chapter 2, Making Measurements
Receiver Performance in Additive Noise
Steps 1 Make the equipment connections as shown in figure 21.
2 On the main menu screen, enter the Base Station Channel number.
3 Scroll to and select Setup CDMA Generator.
4 Set the Generator Mode to Eb/No. Note that a new field appears called
Eb/No Level.
5 Set the Eb/No Level as called for in the test standard or in your base station test
procedures (for example, 5.5 dB).
6 Scroll to and set the RX PN Offset, typically to 0.
7 Scroll to and set the Data Source to Random.
8 Set the RF Level as called for in your test procedure.
9 At this point, the CDMA signal generator is transmitting with random data and noise.
Read the resulting Frame Error Rate from the base station.
10 If desired, change the Eb/No Level according your test procedure and read the
resulting FER value.
11 When finished, return to the main menu by pressing the Main Menu (k5) USER key.
Figure 22
Notes The cable loss (including losses through splitters, couplers, and so forth) entered
into the Configuration Information Menu screen is taken into account
when signal generator RF level settings are made. The level at the PCS Interface
RF IN/OUT port is increased by the loss amount so the displayed RF level
indicates the true level delivered to the base station’s receiver test port(s).
The field
RX PN Offset is provided for you to change the offset for your
testing, if required. Normally, mobiles transmit on system time which
corresponds to an offset of 0 (the default value in the Software menu).