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R2012a Documentation → Communications System Toolbox
View documentation for other releases	Learn more about Communications System Toolbox

Contents

Index

• Getting Started

Required Products

Expected Background

Configure the Simulink Environment for Communications Models

Demos in the Help Browser

Demos on the Web

Demos on MATLAB Central

Section Overview

Opening the Model

Overview of the Model

Quadrature Amplitude Modulation

Run a Simulation

Display the Error Rate

Set Block Parameters

Display a Phase Noise Plot

Section Overview

Modulate a Random Signal

Plot Signal Constellations

Pulse Shaping Using a Raised Cosine Filter

Use a Convolutional Code

Create a System Object

Define a New System Object

Change a System Object Property

Run a System Object

Display Available System Objects

Create a New System Object

Retrieve System Object Property Values

Set System Object Property Values

What are System Object Methods?

The Step Method

Advantages of Using Methods

Understand System Object Modes

Change Properties While Running System Objects

Change System Object Input Complexity or Dimensions

Considerations for Using System Objects in Generated Code

Use System Objects with codegen

Use System Objects with the MATLAB Function Block

Use System Objects with MATLAB Compiler

• User's Guide

• Signal Sources

• Performance Evaluation

• Source Coding

• Error-Control Coding

• Interleaving/Deinterleaving

• Analog Modulation/Demodulation

• Digital Modulation/Demodulation

• Pulse Shaping

doppler.bigaussian

doppler.gaussian

doppler.rounded

filter (channel)

legacychannelsim

reset (channel)

• Galois Field

• Galois Fields of Odd Characteristic

• GUI

• Block Library Functions

• System Objects

• Release Notes

legacychannelsim - Toggles random number generation mode for channel objects

Syntax

b = legacychannelsim legacychannelsim(true) legacychannelsim(false) oldmode = legacychannelsim(newmode)

Description

b = legacychannelsim returns FALSE if the R2009b and later versions of random number generator is used by rayleighchan, ricianchan, or mimochan functions are used, which is the default. It returns TRUE if pre-R2009b versions are used. See Version 4.4. (R2009b) Communications System Toolbox Release Notes for more information.

legacychannelsim(true) reverts the random number generation mode for channel objects to pre-2009b version.

Note legacychannelsim(true) will support the reset(chan,randstate) functionality.

legacychannelsim(false) sets the random number generation mode for channel objects to 2009b and later versions.

oldmode = legacychannelsim(newmode) sets the random number generation mode for channel objects to NEWMODE and returns the previous mode, OLDMODE.

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