Rohde & Schwarz EX-IQ-BOX, Руководство пользователя

Страница: 137 / 418

Protocol Settings
R&S
®
EX-IQ-BOX
122 User Manual 1409.5570.32 ─ 05
"PRBS" Generates a PRBS 16 ( P seudo R andom B inary S equence) sequence.
The output of this sequence complies to the "Protocol", "Data" and
"Clock" settings of the R&S
EX-IQ-BOX.
E.g. if the word size of the I / Q sample is 7 bits, the R&S EX-IQ-BOX
sends the PRBS 16 sequence in 7-bit parts.
The I and Q values always contain the same copy of one test sample.
The PRBS 16 sequence is defined by the generator polynomial G(x) =
1 + x
2 + x 3 + x 5 + x 16 .
Example:
The functional implementation of this PRBS generator is also defined
by the following linear feedback shift register (LFSR):
Fig. 7-39: User defined > Test PRBS linear feedback shift register (LFSR)
"Counter" Generates a counter test signal. The counter size is based on the word
size, set in the "Data" tab. Each output sample increases the counter
by 1.
"Sine" A complex sine signal is generated, following the formula below,
Fig. 7-40: User defined > sine signal formula
n = discrete time index
f = frequency of the test sine signal
f
s
= sampling frequency, based on the "protocol", "data" and "clock" settings.
with the real component,
Fig. 7-41: User defined > sine signal I component formula (real)
and the imaginary component:
Fig. 7-42: User defined > sine signal Q component formula (imaginary)
Remote command:
​
[:
​
SOURce<hw>]:
​
EBOX:
​
USER:
​
TEST:
​
TX:
​
SIGNal
​
on page 279
User Defined