Agilent Technologies N5181A/82A manual Matlab Programming Examples, Creating and Storing I/Q Data

Creating and Downloading Waveform Files

Programming Examples

iwrite(id, iqbuffer, bytesToSend, 0, 0);

iwrite(id, “\n”, 1, 1, 0);

printf(“Loaded FILE2 using the E4438C, E8267C and E8267D format\n”);

return 0;

}

MATLAB Programming Examples

This section contains the following programming examples:

•“Creating and Storing I/Q Data” on page 255

•“Creating and Downloading a Pulse” on page 258

Creating and Storing I/Q Data

On the documentation CD, this programming example’s name is “offset_iq_ml.m.”

This MATLAB programming example follows the same coding algorithm as the C++ programming example “Creating and Storing Offset I/Q Data—Big and Little Endian Order” on page 232 and performs the following functions:

•error checking

•data creation

•data normalization

•data scaling

•I/Q signal offset from the carrier (single sideband suppressed carrier signal)

•byte swapping and interleaving for little endian order data

•I and Q interleaving for big endian order data

•binary data file storing to a PC or workstation

•reversal of the data formatting process (byte swapping, interleaving, and normalizing the data)

function main

%Using MatLab this example shows how to

%1.) Create a simple IQ waveform

%2.) Save the waveform into the Agilent MXG/ESG/PSG Internal Arb format

%This format is for the N5182A, E4438C, E8267C, and E8267D

%This format will not work with the earlier E443xB ESG

%3.) Load the internal Arb format file into a MatLab array

%1.) Create Simple IQ Signal *****************************************

%This signal is a single tone on the upper

%side of the carrier and is usually refered to as

%a Single Side Band Suppressed Carrier (SSBSC) signal.

%It is nothing more than a cosine wavefomm in I

%and a sine waveform in Q.

%

points = 1000; % Number of points in the waveform

cycles = 101; % Determines the frequency offset from the carrier

Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide 255