Baseband File Reader

Read baseband signals from file

• Library:

• Communications Toolbox / Comm Sources

• 

Description

The Baseband File Reader block reads a signal from a baseband file. A baseband file is a specific type of binary file written by the Baseband File Writer block. Baseband signals are typically downconverted from a nonzero center frequency to 0 Hz. The block automatically reads the sample rate, center frequency, number of channels, and any descriptive data.

Ports

Output

Data — Baseband signal

scalar | vector | matrix

Baseband signal, returned as a scalar, vector, or matrix. The signal is read from the file specified by the Baseband file name parameter. The sample time is either inherited from the file or can be set by the Sample Time (s) parameter.

Data Types: double
Complex Number Support: Yes

EOF — End-of-file indicator

logical scalar

End-of-file indicator, returned as a logical scalar. The output is true when the Repeatedly read the file parameter is false and the entire file has been read. To enable this port, select the Output end-of-file indicator parameter.

Parameters

Baseband file name — Name of file from which data is read

example.bb (default) | character vector

Specify the name of the baseband file as a character vector.

Click Browse to locate the baseband file you want to read. Click File Info to display this information:

• File name

• Sample rate

• Center frequency

• Number of samples

• Number of channels

• Data type

• Any metadata fields

Data Types: char

Inherit sample time from file — Select source of sample time

on (default) | off

Select this check box to inherit the sample time from the file specified by Baseband file name.

Sample time (s) — Block sample time

1 (default) | positive scalar

Specify the block sample time in seconds as a positive scalar. To enable this parameter, clear the Inherit sample time from file check box.

Samples per frame — Number of samples in one frame

100 (default) | positive integer scalar

Specify the samples per frame as a positive integer scalar.

Repeatedly read the file — Continuously loop data from file

off (default) | on

Select this check box to repeatedly read the contents of the baseband file. When the end of the file is reached:

• The block outputs zeros, if the Repeatedly read the file parameter is not selected (off).

• The block outputs samples from the beginning of the file, if the Repeatedly read the file parameter is selected (on).

Simulate using — Type of simulation to run

Code generation (default) | Interpreted execution

Type of simulation to run, specified as Code generation or Interpreted execution.

• Code generation –– Simulate the model by using generated C code. The first time you run a simulation, Simulink^® generates C code for the block. The C code is reused for subsequent simulations unless the model changes. This option requires additional startup time, but the speed of the subsequent simulations is faster than Interpreted execution.

• Interpreted execution –– Simulate the model by using the MATLAB^® interpreter. This option requires less startup time than the Code generation method, but the speed of subsequent simulations is slower. In this mode, you can debug the source code of the block.

Model Examples

Read Baseband Signal from File in Simulink

Read the baseband signal from the saved file example.bb.

Write Baseband Signal to File in Simulink

Generate and write a QPSK-modulated signal to a file. Then, read the file and plot the constellation diagram of the signal.

Block Characteristics

Data Types	double | integer | single
Multidimensional Signals	no
Variable-Size Signals	no

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.