Arb Files |
Interpreting the Binary Sequence
7
the sequence at the cursor location. You can also insert pseudo-noise sequences with the
Insert PN7
and
Insert PN9
buttons. You can manually set the seed for the pseudo random sequences to repeatability
tests.
Using the
Load Data
and
Save Data
buttons you can export and import text files containing binary
sequences. The file format for the binary sequences is simply a text file (.txt extension) and text zeros
and ones defining the sequence. There should be no other characters or whitespace (tabs, spaces, and
newlines) in the file.
INTERPRETING THE BINARY SEQUENCE
The binary sequence will be interpreted differently depending on modulation type selected. The
sequence will be split according to how many bits per symbol are required for the selected modulation.
The sequence is zero-padded at the end of the sequence if needed to create a sequence of an integer
number of symbols.
5
Arb Files
The software allows you to load custom I/Q arb files which fully define the device output. The files follow
a standard format which is described below.
The file should have the extension .csv. It can be easily edited in a spreadsheet application such as
Microsoft Excel or any basic text editor. The format is as follows:
Center frequency in Hz,
Amplitude in dBm,
Sample Rate in S/s,
Samples Count,
Period Count
I0, Q0,
I1, Q1,
…
Icount-1, Qcount-1
An example of this format is as follows:
1000000000,
-20,
200000,
2,
8,
1, 0,
0, 0,
The example shown above describes a signal output at 1GHz at -20dBm, and a pulse modulated signal
with a duty cycle of 1/8. The pulse width is 5 microseconds and pulse period is 40 microseconds.
Summary of Contents for VSG25
Page 1: ...VSG25 Software Manual...
