Atec Spirent-TAS5600 - Manual (Page 4)

4 TAS5600 Universal Interference Emulator
In order to have confidence in receiver
performance test results, the level of
uncertainty of the test system must be
TAS5600's high C/N (and C/I) ratio setting accuracy make it
ideal for receiver performance breakpoint characterization.
Unprecendented Performance
minimized. Further, parasitic signals
not associated with the test should not
be present.
Receiver Performance Characterization
Impact on BLER/FER
Measurement Accuracy
C/N Setting Accuracy
10 -1
10 -2
10 -3
I or /I oc
BLER/FER
Accuracy
When constructing a test setup for
receiver testing one of the most
important performance criteria is the
accuracy of signal-to-noise (SNR) ratios.
Unlike analog modulation schemes,
modern receivers use spread spectrum
in conjunction with convolutional or
turbo coding and have error rate
performance that degrades rapidly as
certain breakpoints are crossed. For
this reason, signal-to-noise ratio
accuracy is extremely important. Small
errors in SNR will show up as large differences in error rate. In order to
have confidence in the error rate results,
there must be a high degree of
confidence in the SNR setting.
By combining an instrument grade
power meter along with factory
calibrated signal paths, the 5600
provides:
■ Accurate ratio generation and
level setting
■ Excellent repeatability
■ Increased confidence in test
results
Measurement Performance
Challenge