Sources and Sinks

Input and output signals and sequences

Communications Toolbox™ contains System objects, blocks, and functions to produce generate signal source data and noise to simulate communication links. Communications Toolbox also provides System objects, blocks, and functions to display and analyze the performance of your communication system simulation.

Apps

Wireless Waveform Generator

Create, impair, visualize, and export modulated waveforms

Functions

expand all

Sources

`randi`	Uniformly distributed pseudorandom integers
`randerr`	Generate bit error patterns
`randsrc`	Generate random matrix using prescribed alphabet
`commsrc.combinedjitter`	Construct combined jitter generator object
`commsrc.pattern`	Construct pattern generator object
`commsrc.pn`	Create PN sequence generator object
`zadoffChuSeq`	Generate root Zadoff-Chu sequence
`mask2shift`	Convert mask vector to shift for shift register configuration
`shift2mask`	Convert shift to mask vector for shift register configuration
`wgn`	Generate white Gaussian noise samples

Sinks

`biterr`	Number of bit errors and bit error rate (BER)
`eyediagram`	Generate eye diagram
`scatterplot`	Generate scatter plot
`symerr`	Compute number of symbol errors and symbol error rate

Objects

expand all

Sources

`comm.BarkerCode`	Generate bipolar Barker code
`comm.BasebandFileReader`	Read baseband signals from file
`comm.GoldSequence`	Generate Gold sequence
`comm.HadamardCode`	Generate Hadamard code
`comm.KasamiSequence`	Generate Kasami sequence
`comm.OVSFCode`	Generate OVSF code
`comm.PNSequence`	Generate a pseudo-noise (PN) sequence
`comm.RBDSWaveformGenerator`	Generate RDS/RBDS waveform
`comm.WalshCode`	Generate Walsh code from orthogonal set of codes

Sinks

`comm.BasebandFileWriter`	Write baseband signals to file
`comm.ConstellationDiagram`	Display constellation diagram for input signals
`comm.EyeDiagram`	Display eye diagram of time-domain signals

Blocks

expand all

Sources

Barker Code Generator	Generate bipolar Barker Code
Baseband File Reader	Read baseband signals from file
Bernoulli Binary Generator	Generate Bernoulli-distributed random binary numbers
Gold Sequence Generator	Generate Gold sequence from set of sequences
Hadamard Code Generator	Generate Hadamard code from orthogonal set of codes
Kasami Sequence Generator	Generate Kasami sequence from set of Kasami sequences
OVSF Code Generator	Generate orthogonal variable spreading factor (OVSF) code from set of orthogonal codes
PN Sequence Generator	Generate pseudonoise sequence
Poisson Integer Generator	Generate Poisson-distributed random integers
Random Integer Generator	Generate integers randomly distributed in specified range
Walsh Code Generator	Generate Walsh code from orthogonal set of codes

Sinks

Baseband File Writer	Write baseband signals to file
Constellation Diagram	Display constellation diagram for input signals
Eye Diagram	Display eye diagram of time-domain signal

Topics

Signal Terminology

This section defines important Communications Toolbox terms related to matrices, vectors, and scalars, as well as frame-based and sample-based processing.

Sources and Sinks

Error statistics and plotting.

Random Noise Generators

You can generate noise for communication system modeling using the MATLAB Function block with a random number generator.

Spreading Sequences

Comparison of spreading sequences for single and multiuser scenarios in single path and multipath environments.

Using Wireless Waveform Generator App

Create, impair, visualize, and export modulated waveforms.

Read Signals From Hardware Devices

Communications Toolbox software can read a signal from external hardware devices using the Communications Toolbox support packages for software-defined radio (SDR).

Export Data to MATLAB

Sending the simulation results to the MATLAB workspace and using MATLAB to analyze the data.