Double click on the MATLAB Function Block and enter in the code below in the MATLAB block. Search for "MATLAB Function" and add it to your model subsystem. Enter into the subsystem and delete the "ADD" block. Copy your previously created FM modulator subsystem. Using MATLAB Code Within SIMULINK In this section we would like to modify the "ADD" block with a user provided MATLAB function. Take a snapshot of the output of the SCOPE. Run the simulation again confirm that the system still works. Ver.1 7Ĩ Condense the two FM modulation blocks into one FM modulation subsystem as shown below. The SCOPE should be able to be configured to show something similar to what is shown below: If the output is only a portion of the recorded waveform the "history" of samples record may need to be modified, or the waveform needs to be set to auto scale. Refer to the AM modulation solver configuration. The Discrete- Time Integrator should have a sample time of 0.01 (the same as the simulation sample time, previously set in the AM Modulation portion). Ver.1 1ħ Configure the blocks to suit the system. Configure the output either with outputs within SIMULINK or export data to the MATLAB workspace for more control over the plotting, or additional post processing. These are provided with MATLAB The time step and various differential equation boundary conditions should be defined. Set simulation Options/ Solver options: The type of solver to use ODE45, ODE3, etc. If it's a sine waveform: Amplitude, frequency, phase need to be defined. If it's a spring model, an appropriate "K" value needs to be defined. There are many resources to construct model topologies As previously mentioned each block needs to be defined with appropriate model parameters.
Define the blocks add details about sources, sinks, operators. Add blocks that correspond to model dynamics/functions: Sine waveforms, constants, filters, ramps, scopes, user functions etc. Create new model from the SIMULINK library browser menu pull downs: FILE- >New Model 3. A typical SIMULINK work flow session will consist of the following steps 1. While the suggested reading and activity will only scratch the surface of SIMULINK it is intended to bring the reader up to a basic understanding of SIMULINK and its interaction within MATLAB. SIMULINK enables quick evaluation of simple to complex systems and can shed insight into system behavior in a fraction of the time of physical prototypes. In addition to the model elements the equation solver that governs the simulation needs to be configured as well. These properties need to be configured to represent the system being modeled.
Each entity within the model contains properties that control the function and the characteristics of each block. To complex enigmatic entities like neural networks and image processing engines. These elements can be as basic as passive elements such as power supplies, sine waves, resistors, capacitors etc.
A model consists of sources and sinks and intermediate blocks that represent basic dynamical system elements. Background: SIMULINK is a model based difference or differential equation solver using simulation time/time steps as a fundamental basis for the simulation's construction and evaluation. Apply and investigate AM and FM modulation within SIMULINK. Utilize variables between the MATLAB workspace and the SIMULINK model space. Be able to create, configure and run a simple model. Understand the basics of SIMULINK and how it works within MATLAB. 1 ES442 Final Project AM & FM De/Modulation Using SIMULINK Goal: 1.
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