Baseband File Writer

Write baseband signals to file

• Library:

• Communications Toolbox / Comm Sinks

• 

Description

The Baseband File Writer block writes a baseband signal to a specific type of binary file. Baseband signals are typically down-converted from a nonzero center frequency to 0 Hz. Sample rate, which is determined by the input signal sample time and frame size, and center frequency are saved when the signal is written to a file.

Ports

Input

Port_1 — Baseband signal

scalar | vector | matrix

This port accepts a baseband signal to be saved under the filename specified by the Baseband file name parameter. The saved signal is always complex.

Data Types: single | double
Complex Number Support: Yes

Parameters

Baseband file name — Name of file in which data is saved

untitled.bb (default) | character vector

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

To specify the location where the file is saved, click Browse.

Center frequency (Hz) — Center frequency of the baseband signal

1e8 (default) | nonnegative scalar

Specify the center frequency in Hz as a nonnegative scalar.

Metadata in a structure — Data describing the baseband signal

struct() (default) | structure

Specify data describing the baseband signal as a structure. If the signal has no descriptive data, this parameter is an empty structure. The structure can contain any number of fields. Field names have no restrictions, but the field values must be numeric, logical, or character data types having any dimension.

Number of latest samples to write — Number of samples to write

inf (default) | positive scalar

Specify the number to write. If this parameter is inf, all samples are saved. Otherwise, only the last N samples are saved, where N is specified by this parameter.

Simulate using — Select simulation mode

Code generation (default) | Interpreted execution

Code generation

On the first model run, simulate and generate code for the block using only MATLAB^® functions supported for code generation. If the structure of the block does not change, subsequent model runs do not regenerate the code.

Interpreted execution

Simulate model using all supported MATLAB functions. Choosing this option can slow simulation performance.

Model Examples

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

Tips

• The Baseband File Writer block writes baseband signals to uncompressed binary files. To share these files, you can compress them to a zip file using the zip function. For more information, see Create and Extract from Zip Archives.

Extended Capabilities

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