Atec Spirent-TAS5600 - Manual (Page 8)

8 TAS5600 Universal Interference Emulator
In order to verify that CDMA2000
handsets and base stations conform to
the requirements of IS-97 or IS-98
standards, various co-channel and
adjacent channel interference tests are
performed. These tests verify a
minimum level of receiver or transmitter
performance in the presence of co-
Accuracy and Purity
channel and adjacent channel
interfering signals. The types of
interfering signals required can include
forward and reverse link CDMA2000
signals, single and dual tones, or
AWGN. The level accuracy and purity
required for these interfering signals is
demanding. Addressing IS-97 and IS-98 Test
Requirements
In order to accurately assess the Frame
Error Rate (FER) performance of a
CDMA2000 receiver it is critical to set
the Ior/Ioc ratio accurately. Highly
accurate level settings can be difficult
to achieve in custom built setups given
the implications of VSWR interaction,
power level requirements, and fading
conditions. A custom built setup will
also require calibration with each use
and consistency across different test
stations will be difficult to achieve.
Inaccurate ratio settings can invalidate
days of testing and cause
inconsistencies in performance
evaluations. Because of the nature of
CDMA, small errors in Ior/Ioc cause large changes in FER. The TAS5600 has
been designed specifically to address
this ratio accuracy challenge. Using an
internal instrument grade power meter,
factory calibration, and proprietary
techniques, the TAS5600 demonstrates
a level of performance that ensures
accurate and consistent results over
time and across different test setups.
The TAS5600 exceeds IS-97 and IS-
98 test specifications with:
■ Accurate Ratio and Level
Settings
■ Ultra-Low Phase Noise
■ Excellent ACLR Performance
CDMA2000 Receiver Testing
TAS5600 provides
accurate, repeatable
interference ratios.
Accurate, Repeatable Level Setting
TAS5600’s Performance
Competition’s Performance