R&S WinIQSIM2 Software Manual - Rohde & Schwarz

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R&S ® WinIQSIM2 Remote Control Commands R&S Signal Generator Waveform and List Format {CONTROL LIST WIDTH4–Length: #m0m1…mx…mM-1} (optional for waveforms and multi segment waveforms) The tag contains a binary marker element stream, which will be given out synchronously to the I/Q sample sequence. One marker element mx consists of 4 bit, which are assigned to the 4 possible marker lines of the instrument (one bit per marker line). One 4 bit marker elements is needed for every I/Q sample in the WAVEFORM tag - so the number of marker elements M should be equal to the number of I/Q samples. The CONTROL LENGTH tag has to contain the number of all marker elements M. Fig. 7-1: Marker element in 4-bit binary format bit order For standard waveforms the MARKER LIST x tags are a more compact way to define markers, but in prinziple this CONTROL LIST WIDTH4 format can also be used instead of the MARKER LIST x tags. For multi segment waveforms this CONTROL LIST WIDTH4 format is required for marker definition. The binary marker streams of the individual segments are directly concatenated (without any gap) to one collectively marker stream. Setting parameters: Length mx Defines the number of bytes in the CONTROL LIST WIDTH4 tag in ASCII Format and is calculated as follow: Length = Size of "#" (1 byte) + Number of marker elements m x * (4 bit) / (8 bits/byte) The value is rounded up for byte alignment. Marker element in 4-bit binary format. Example: {CONTROL LIST WIDTH4-51: #m 0 m 1 …m x …m 99 } 100 marker elements, each marker element with 4 bits Usage: Setting only 7.2.2 How to Create a Waveform Manually This section provides an example on how to create a waveform manually. The provided example uses a sine function in the I channel and a cosine function in the Q channel, each with 20 points. The sine and cosine values are calculated by a short program written in the programming language C (see example "C-program for creating a waveform file" on page 183). They are stored in the file SICO.txt. The decimal values in SICO.txt are normalized such that they are between –1.0 and +1.0. The data is consecuently converted into binary format. The appropriate manadtory tags are added and the data is packed into the WAVEFORM tag. As result, the waveform file SICO.wv is generated. Software Manual 1008.0858.42 ─ 10 180
R&S ® WinIQSIM2 Remote Control Commands R&S Signal Generator Waveform and List Format This example follows the general principle of creating of a waveform manually. The figure 7-2 illustrates this general workflow. Fig. 7-2: Principle of creating a wavefrom manually The following steps outline how to create the waveform file SICO.wv: 1. Calculate the sine and cosine values, e.g. use the SICO.cpp program. The result is stored in the file SICO.txt. Fig. 7-3: Contents of SICO.txt: first column Sine (I), second column Cosine (Q) 2. Convert the values from the file SICO.txt into binary format consisting of 16-bit signed integer numbers. The numeric range between –1.0 and +1.0 corresponds to the modulation range of the waveform 16-bit D/A converter of -32767 to +32767. Software Manual 1008.0858.42 ─ 10 181
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R&S WinIQSIM2 Software Manual - Rohde & Schwarz

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