Skip to main content

How to use MATLAB Simulink



Introduction to MATLAB Simulink

MATLAB Simulink is a popular add-on of MATLAB. Here, you can use different blocks like modulator, demodulator, AWGN channel, etc. And you can do experiments on your own.

Simulink Interface

Steps to Get Started

  1. 1. Go to the 'Simulink' tab at the top navbar of MATLAB. If not found, click on the add-on tab, search 'Simulink,' and then click on it to add.
  2. 2. Once you installed the simulation, click the 'new' tap at the top left corner.
  3. 3. Then, search the required blocks in the 'Simulink library.' Then, drag it to the editor space.
  4. 4. You can double-click on the blocks to see the input parameters.
  5. 5. Then, connect the blocks by dragging a line from one block's output terminal to another block's input.
  6. 6. If the connection is complete, click the 'run' tab in the middle of the top navbar.
  7. 7. After clicking on the run button, your Simulink is ready. Then double-click on any block to see the output.

Example: QPSK Simulation

The following block diagram is an example of the MATLAB simulation of 'QPSK' or quadrature phase shift keying.

QPSK Modulation and Demodulation
Fig: QPSK Modulation and Demodulation

In the above figure, for QPSK modulation and demodulation, we've used blocks like Random Integer Generator to generate the random integers 0, 1, 2, and 3, which are the inputs of the QPSK modulators. Then, the signal passes thru the AWGN channel.

At the receiver side, we demodulate the signal using a QPSK demodulator. A scope is connected to the output terminal of the demodulator. Scopes are used to visualize the output signal.

Return to Home →

Want to try Simulation now?

Explore our advanced tools and interactive wireless communication simulators.

Launch Simulator →

Further Reading

📊 MATLAB & ONLINE SIMULATIONS (Web-Based)
🎓 GATE & UGC - NET SOLUTIONS
📡 WIRELESS & SIGNAL PROCESSING


Contact Us

Name

Email *

Message *

Popular Posts

UGC NET Electronic Science Previous Year Question Papers with Solutions

Download Papers and Solutions Exam Pattern Preparation Tips FAQs More Home / Engineering & Other Exams / UGC NET 2026 PYQ 📊 Exam Highlights: Electronic Science (88) Feature Details Junior Research Fellowship (JRF) ₹37,000 + HRA per month Eligibility M.Sc/M.Tech in Electronics (55%) Validity of Certificate JRF (3 Years) | Lectureship (Lifetime) 📥 Download UGC NET Electronics PDFs Complete collection of previous year question papers, answer keys and explanations for Subject Code 88. Start Downloading 📂 View All Question Papers June 2026 - Question Paper Download PDF June 202...
Read more

MATLAB Code for Constellation Diagram of QAM configurations such as 4, 8, 16, 32, 64, 128, and 256-QAM

📘 Overview of QAM 🧮 4-QAM MATLAB 🧮 16-QAM MATLAB 🚀 Online Simulator 📂 Other Topics on Constellation Diagrams... ▼ 🧮 MATLAB Code for 4-QAM 🧮 MATLAB Code for 16-QAM 🧮 MATLAB Code for m-ary QAM 🧮 Simulator for m-ary PSK 🧮 Simulator for m-ary QAM 🧮 Overview of Energy per Bit (Eb / N0) 🧮 Simulator for ASK, FSK, and PSK Overview of QAM One of the best-performing modulation techniques is QAM [↗] . Here, we modulate the symbols by varying the carrier signal's amplitude and phase in response to the variation in the message signal (or voltage variation). So, we may say that QAM is a combination of phase and amplitude modulation. Additionally, it performs better than ASK or PSK [↗] . In fact, any constellation for any type of modulatio...
Read more

Coherent vs. Non-Coherent Demodulation

  For demodulation In general: 1. Synchronous (coherent) demodulation Receiver generates a local carrier/oscillator . It combines/multiplies the received signal with that carrier. Then a filter extracts the message. Received signal ↓ × Local oscillator ↓ Low-pass filter ↓ Message So yes, carrier multiplication is a common implementation of synchronous demodulation . 2. Asynchronous (non-coherent) demodulation Receiver doesn't need a phase-synchronized local carrier . It uses properties of the received signal itself to recover the information. For ASK , an envelope detector is the classic example: ASK signal ↓ Diode + RC ↓ Envelope ↓ Comparator ↓ Data Modulation Synchronous demodulation Non-coherent/asynchronous demodulation ASK/OOK Local carrier + multiplier Envelope detector AM Product detector Envelope detector FSK Coherent correlator/mixer Frequency discriminator, filters, etc. PSK Local synchronized carrier + multiplier Differential/n...
Read more

(Filters) Free MATLAB alternative for signal analysis

Advanced Signal Filters Upload CSV (1st Col) or Audio (WAV, MP3, etc.) Generate Messy Signal (20Hz + 50Hz + 150Hz) No Operation FFT (Spectrum) Amplitude Modulation (AM) Double Sideband Supressed Carrier (DSBSC) Pulse Amplitude Modulation (PAM) Flat Top PAM Filters - LPF, HPF, BPF, Notch Principal Component Analysis (PCA) Cross Spectrum Filter Type: Signal Cleaner ...
Read more

CMOS Logic Gates: Inverter, NAND, and NOR

CMOS Logic Gates: Inverter, NAND, and NOR Complementary metal–oxide–semiconductor (CMOS) technology forms the backbone of modern digital IC design. Patented by Frank Wanlass in 1963 ( US patent 3,356,858 ), CMOS enables low-power, high-speed, and noise-immune logic circuits. CMOS gates, including inverters, NAND, and NOR, are widely used in both large-scale and small-scale integrated circuits due to their efficiency and versatility. CMOS Inverter A CMOS inverter consists of a complementary pair of PMOS and NMOS transistors. The PMOS transistor connects to the supply voltage V DD , while the NMOS connects to ground. The input voltage V IN controls both gates, and the output voltage V OUT is taken from the connected drains. CMOS inverters are highly energy-efficient and produce minimal heat due to their comple...
Read more

OFDM Symbols and Subcarriers Explained

This article explains how OFDM (Orthogonal Frequency Division Multiplexing) symbols and subcarriers work. It covers modulation, mapping symbols to subcarriers, subcarrier frequency spacing, IFFT synthesis, cyclic prefix, and transmission. Step 1: Modulation First, modulate the input bitstream. For example, with 16-QAM , each group of 4 bits maps to one QAM symbol. Suppose we generate a sequence of QAM symbols: s0, s1, s2, s3, s4, s5, …, s63 Step 2: Mapping Symbols to Subcarriers Assume N sub = 8 subcarriers. Each OFDM symbol in the frequency domain contains 8 QAM symbols (one per subcarrier): Mapping (example) OFDM symbol 1 → s0, s1, s2, s3, s4, s5, s6, s7 OFDM symbol 2 → s8, s9, s10, s11, s12, s13, s14, s15 … OFDM sym...
Read more

Interactive Sallen-Key filter Simulation (2nd order LPF)

  Sallen-Key Filter Explained: Why It’s the Most Popular Second-Order Low-Pass Filter Sallen-Key Filter Explained: Why It’s the Most Popular Second-Order Low-Pass Filter (With Math) If you're learning analog electronics, active filters, or preparing for engineering interviews and exams, you've probably come across the Sallen-Key filter . But what exactly is it, and why do engineers prefer it over simply cascading RC low-pass filters? Live Interactive Simulator Adjust the component values to see the real-time frequency response (Bode Plot). R1 (kΩ): 10 R2 (kΩ): 10 C1 (nF): 10 C2 (nF): 10 ...
Read more

ADC Conversion Time Comparison: Flash, SAR, Ramp & Dual-Slope ADC

ADC Conversion Time Comparison: Flash, SAR, Ramp & Dual-Slope ADC ADC Conversion Time: Flash, Digital Ramp, SAR and Dual-Slope ADC Analog-to-digital converters (ADCs) convert continuous analog signals into digital values. Different ADC architectures require different amounts of time to complete this conversion. This guide explains the working principles, conversion-time formulas, and differences between Flash, Digital Ramp, Successive Approximation, and Dual-Slope ADCs. Table of Contents Flash ADC conversion time Digital Ramp ADC conversion time Successive Approximation ADC conversion time Dual-Slope ADC conversion time ADC conv...
Read more