Atec Spirent-TAS5600 - Manual (Page 9)

9 TAS5600 Universal Interference Emulator
The TAS5600 contains the necessary
modulated interferers for both forward
and reverse link receiver adjacent
channel interference testing. Low
Adjacent Channel Leakage Ratio (ACLR)
performance and long data sequence
length ensure the highest level of
confidence for Adjacent Channel
Selectivity tests.
For handset testing, the TAS5600
generates an interfering forward link
base station signal that includes the
pilot, paging, sync, and six traffic
channels. The reverse link modulated
interferer, used for base station testing,
contains a reverse link pilot only, as
required by CDMA2000 standards. An
important characteristic of the
CDMA2000 modulated interferer is its
data sequence repetition rate. To
produce accurate FER test case results,
the data contained in the paging, sync,
and traffic channels should not repeat
for the duration of the test. Unlike many
commercial signal generators that have
data sequences which repeat as often
as every frame, the TAS5600 uses real-
time signal generation techniques to
generate data sequences with very low
repetition rates. To maximize
confidence in FER test case results, the
data on each of the channels in the
forward link interferer is random and
has a minimum sequence length of one
hour. This significantly exceeds
industry test requirements.
The TAS5600 includes the following
CDMA2000 interference types:
■ Forward Link CDMA2000
■ Reverse Link CDMA2000
■ Single and Dual CW
■ AWGN
CDMA2000 Interference Types
TAS5600 provides all the
applicable CDMA2000
Uplink and Downlink
channels. This Code
Domain plot shows a
CDMA2000 channel.
Unlike most CDMA signal
generators, the sequence
length of the generators
in the TAS5600 results in
a test duration long
enough to give a high
degree of confidence in
the test results.
Generated Signal Sequence Length
Most
CDMA Signal
Generators
TAS5600
SEQ1 SEQ1 SEQ1 SEQ1 SEQ1 SEQ1 SEQ1 SEQ1 SEQ1 SEQ1 SEQ1
SEQ1
Typical Test Duration
Sequence Length of Generated Interferer Signal