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Chapter 2, Making Measurements
Receiver Performance in Additive Noise
Receiver Performance in Additive Noise
Overview In this test, the CDMA signal generator is used with the Additive White Gaussian
Noise (AWGN) source to simulate an uplink signal to the base stations’s receiver.
Various levels of signal-to-noise (E
b
/N
o
) can be used and the resulting Frame
Error Rate (FER) is measured at each E
b
/N
o
level.
Figure 21
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