Filter
Top Products
40
Chapter 2, Making Measurements
Receiver Sensitivity
Receiver Sensitivity
Overview In this test, the CDMA generator sends a calibrated signal to the base station’s
receiver. For a given RF level, the resulting Frame Error Rate (FER) is measured.
Standards specify an FER of 1.0% or less at an RF level of
−119 dBm.
Figure 19
NOTE: The test procedures outlined in this section require that you have already configured the
Test System as outlined in chapter 1, "Getting Started".
Requirements • You will need a means of reading the Frame Error Rate (FER) from the base station.
The CDMA generator sends a random bit pattern which the base station decodes and
uses to calculate FER. Some means of reading the calculated value is required. Often
this is done via a laptop PC connected to the station equipment by serial or LAN port.
• This test requires synchronization between the Test System’s CDMA signal generator
and the base-station-under-test. This is achieved using the Even-Second clock signal
from the base station.
• The CDMA generator should be connected directly to the receiver’s input(s). This can
be achieved by connecting to only one input at a time or by using a splitter to connect
to both inputs at once (if there is more than one receiver test port).
• You must know the following about your base station and setup:
❒ The base station channel number setting.
❒ The Receiver PN Offset for the base-station-under-test (typically 0).
H
H
RF IN/OUT
SYNTH
REF IN
(Rear Panel)
Time Base
Receiver Port 1
EVEN SECOND/
SYNC IN
Even-second
Clock
Receiver Port 2