R&S waveform (.wv) files read and write!

Hello,

How would I read and create R&S waveform (.wv) files? I am not refering to wav sound files by the way. Thanks.

[Walter Roberson]

Related: https://www.mathworks.com/matlabcentral/fileexchange/5296-rohde-schwarz-fsp-spectrum-analyzers for communicating "live" with Rohde & Schwarz® FSP series of spectrum analyzers. But that FEX contribution was created a long time ago and might no longer be compatible..

[huachuca]

Thanks for telling me. I happen to have the proper tool boxes for instrument communication, and unfortunately they aren't capable of creating .wv files unless I am wrong. I can creatie my own IQ/complex values and all for a specified waveform, however, I need to save as .wv including the metadata which is required to upload to R&S signal generator.

[Cris LaPierre]

Can you share a sample file? You can zip it and attach it to your post using the paperclip icon.

You might find the approach taken in this Answers post helpful. It's a different file type, but I imagine the solution here would look very similar.

[Cris LaPierre]

I wouldn't expect it to work as is. You need to adapt it to your file type. That means using the correct bit order, data type and format of the *.wv file. This page may offer a starting point: https://www.rohde-schwarz.com/us/applications/converting-r-s-i-q-data-files-application-note_56280-35531.html

Answer 1

[Cris LaPierre]

Your file format is definitely different. Rather than being all binary, like the example I linked to, it captures the binary data in the waveform data field. The file format looks like this

It's going to take a mixed approach to extract the data.

Since you haven't provided the file format description, I did a quik look. The waveform data appears to be captured as int16 values stored in little endian format. This code can read the file you have shared.

unzip('BPSK.zip')

% Define the filename
filename = 'BPSK.wv';

% Open the file for reading
fileID = fopen(filename, 'r');
c = 2;
pos(1) = 0;
while ~feof(fileID)
    [data, pos(c)] = textscan(fileID,'%s',1,'Delimiter',{'{','}'},'MultipleDelimsAsOne',true);
    token = data{1};

    switch true
        case contains(token,'TYPE')
            str = split(token,':');
            type = str(2);
        case contains(token,'CLOCK')
            str = split(token,':');
            clock = str2double(str(2));
        case contains(token,'LEVEL OFFS')
            str = split(token,{':',','});
            leveloffs = str2double(str(2:end))';
        case contains(token,'WAVEFORM-')
            str = split(token,'#');
            L = str2double(extract(str{1},digitsPattern))-1;
            fseek(fileID,pos(c-1)+length(str{1})+1,'bof');
            wv = fread(fileID,[2,L/2],'int16','ieee-le');
            wv = wv.*(wv<0)./32768 + wv.*(wv>=0)./32767;
            I = wv(1,:);
            Q = wv(2,:);
    end
    c=c+1;
end
fclose(fileID);

t = 0:1/clock:(length(I)-1)/clock;
tiledlayout(2,1)
nexttile
plot(t,I)
nexttile
plot(t,Q)

[huachuca]

Thanks this works. As an alternative I used ConvertIQ_13 from R&S to convert the file to ASCII format and went from there.