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JEE Main - Communication System Notes (Free PDF Download)

Last updated date: 21st May 2024
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Achieve Success in JEE Main 2024: Communication System Notes With Important Topics

Vedantu gives you special JEE Main Communication System Notes with important topics to help you score well in JEE Main 2024. Master Teachers at Vedantu make these notes to help you do well. You can easily get these Notes for FREE as a PDF from Vedantu’s website. The most important feature of these notes is that they make concepts simple and have important ideas and theories in a short form.


JEE Main Revision Notes


Text, Images, Videos and PDF


JEE Main

Chapter Name:

Communication System

Academic Session:



English Medium



Available Material:

Chapter-wise Notes with PDF

Communication System Notes PDF should be an essential material for students since this chapter explores the intricate web of transmitting and receiving information through various channels, encompassing principles of modulation, encoding, and decoding for efficient communication. You will get an idea of the importance of the Communication System in JEE Main by looking at the table below. 

Year Wise Weightage of Questions: JEE Main Communication System

Sl. No.


Average No. Of Questions Asked

Marks per Question

Total Marks





















Take advantage of the opportunity to boost your preparation with our Communication System Notes. These notes cover the entire JEE Main Physics syllabus; you can download them for FREE.

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Communication System JEE Main 2024: Important Topics

Here are a few Important topics students should consider when learning the Communication System chapter. These subjects are selected from previous years' JEE Main exams. Therefore, before you get the Revision notes, you can review this list of significant topics from Communication System.

  • Propagation of electromagnetic waves

  • Amplitude modulation

  • Frequency modulation

  • Bandwidth

  • Noise

  • Error detection and correction

  • Data communication

  • Digital modulation

JEE 2024 Physics Notes: Get Chapter-wise Links Here

Access organised JEE 2024 Physics Notes with convenient chapter-wise links. Dive into essential topics, grasp key concepts, and prepare effectively for your exams. Get the edge you need these focused notes.

Learn with Communication System Notes and Score High in JEE Main 2024

Communication System is the chapter that focuses on teaching the principles of signal modulation, demodulation, encoding, decoding, and transmission through various mediums, enabling efficient and reliable communication in modern technology. The weightage of Communication System in JEE Main is around The weightage of Communication System in JEE Main is 3.33%. This means that there is an expected 1 question from this chapter in the JEE Main exam. Students can also expect direct questions from this section, making it one of the scoring topics. Here are the few points that make the chapter high weightage. 

Understanding the Fundamentals of Communication Systems:

A. What is a Communication System?

A communication system is a network of interconnected devices and processes that facilitate the transmission and reception of information. It comprises several components, such as transmitters, receivers, channels, and protocols. By establishing connections, communication systems enable telecommunication and networking, allowing individuals and organizations to exchange information efficiently.

B. Key Elements of Communication Systems:

Information Sharing:

Information sharing is the backbone of communication systems. It involves transmitting and receiving data, voice, and multimedia content. Whether it's making a phone call, sending an email, or streaming a video, information sharing enables effective communication across various platforms.

Signal Processing:

Signal processing is crucial in communication systems. It involves encoding, modulation, and demodulation of signals to ensure efficient transmission and reception of data. By manipulating signals, communication systems can overcome noise and other interferences, delivering clear and reliable information.

Data Transmission:

Data transmission refers to the process of transmitting data from one point to another. Communication systems utilize various methods, including wired and wireless communication, to transmit data. Whether it's through fiber optics or wireless networks, data transmission plays a pivotal role in connecting individuals and organizations.

Advancements in Communication Systems:

A. Wireless Communication:

Wireless communication has revolutionized how we connect and communicate. It has evolved from basic radio systems to encompass technologies like Bluetooth, Wi-Fi, and cellular networks. Wireless communication offers advantages such as mobility, convenience, and flexibility, making it widely utilized in industries such as healthcare, transportation, and entertainment.

B. Optical Communication:

Optical communication relies on the use of optical fibers to transmit data through light signals. This method allows high-speed data transmission and is known for its reliability and security. Optical communication finds applications in telecommunications, internet connectivity, and data centers, catering to the increasing demand for faster and more efficient transmission.

C. Satellite Communication:

Satellite communication enables global connectivity, especially in remote areas. Satellites orbiting the Earth transmit and receive signals, allowing communication over vast distances. This technology plays a crucial role in disaster management, providing communication infrastructure when terrestrial networks are unavailable or disrupted.

Communication Networks:

A. Internet Protocol (IP):

The Internet Protocol (IP) serves as the foundation of communication networks. It assigns unique IP addresses to devices and facilitates packet routing, ensuring that data reaches its intended destination. IP is essential for the internet to function, enabling seamless communication between devices worldwide.

B. Types of Communication Networks:

Digital Communication:

Digital communication systems use discrete signals, represented by binary digits (0s and 1s). This method offers benefits such as error correction, encryption, and higher data capacity. Digital communication finds applications in telecommunications, computer networking, and data transmission, enabling efficient and secure communication.

Analog Communication:

Analog communication uses continuous signals, representing information using varying physical quantities such as voltage or frequency. Although digital communication has gained prominence, analog communication remains relevant in industries such as audio broadcasting and certain types of telephony.

C. Communication Channels:

Communication channels are the mediums through which data is transmitted. They can be either wired or wireless, providing pathways for information to travel. Wired communication channels, such as copper wires and fiber optics, offer reliability and high data rates. Wireless communication channels, including radio waves and microwaves, provide flexibility and mobility.

The Science Behind Communication Systems:

A. Electromagnetic Waves:

Communication systems rely on electromagnetic waves to transmit signals. Electromagnetic waves consist of electric and magnetic fields that oscillate perpendicular to each other. By manipulating the properties of these waves, communication systems can transmit and receive information over various frequencies, enabling wireless communication.

B. Radio Waves:

Radio waves are a type of electromagnetic waves used for wireless communication and broadcasting. They have long wavelengths and are suitable for long-distance transmission. Radio waves find applications in radio broadcasting, wireless networking, and satellite communication, playing a crucial role in our daily lives.

Power of Equations: How Formulas Amplify Revision Note Learning

Equations aren't just symbols; They're your key to solving problems in Physics. By grasping formulas, you'll tackle complex concepts effortlessly and boost your confidence. Dive into the world of equations along with JEE Main Physics Revision notes and amplify your study sessions. Explore our Physics formula pages to start your preparation journey of JEE Main today!

Most Important Formulas of Communication System

  1. Frequency (f), Wavelength (λ), and Speed of Light (c): 

$c = f \lambda$

  1. Bandwidth (B):

  • $\text{For amplitude modulation (AM): } B = 2 \cdot f_m$

  • $\text{For frequency modulation (FM): } B = \Delta f$

  1. Modulation Index (m) for Amplitude Modulation (AM): 

$m = \frac{\text{Amplitude of modulating signal}}{\text{Amplitude of carrier signal}}$

  1. Power in Amplitude Modulation (PAM): 

$P_{AM} = \frac{A_m^2}{2}$

  1. Power in Frequency Modulation (PFM): 

$P_{FM} = P_c \left( \frac{\Delta f}{f_m} \right)^2$

  1. Noise Figure (NF):

$NF = \frac{\text{SNR}_{\text{input}}}{\text{SNR}_{\text{output}}}$

  1. Channel Capacity (C): 

$C = B \log_2(1 + \text{SNR})$

  1. Nyquist Bit Rate (R): 

$R = 2B \log_2(L)$

  1. Shannon-Hartley Theorem: 

$C = B \log_2(1 + \text{SNR})$

  1. Decibel (dB) Calculation: 

$\text{dB} = 10 \log_{10}\left(\frac{P_1}{P_0}\right)$

  1. Link Budget Equation: 

$P_t = P_r + L + G_t + G_r$

Check Other Important Links for JEE Main 2024 Communication System 

Explore additional resources beyond JEE Main 2024 Communication System notes. Check out these other useful links that provide access to learning materials, practice papers, mock tests, and valuable insights. Enhance your preparation, overcome difficulties, and welcome achievement with these resources designed specifically for JEE Main 2024.

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In the journey to excel in your exams, Vedantu’s JEE Main Notes stand as your steadfast companions. These notes simplify complex topics, reinforce your understanding, and prepare you comprehensively. With Vedantu’s guidance, you will confidently navigate exams and achieve success. Embrace The power of JEE Main Notes – download them today to elevate your preparation and reach new heights of accomplishment in your exams. Your path to excellence starts here, with Vedantu’s JEE Main Notes. Get your FREE notes now and seize success!

FAQs on JEE Main - Communication System Notes (Free PDF Download)

1. What are the most important topics included in Communication System Notes for JEE Main 2024?

Most Important Topics of Communication System are:

  1. Signal modulation: AM, FM, PM, PWM, basics of pulse modulation (PAM, PCM)

  2. Demodulation: Techniques for recovering information from modulated signals

  3. Channel bandwidth: Calculation and significance for different types of modulation

  4. Noise & its impact: Different types of noise, signal-to-noise ratio (SNR)

  5. Pulse code modulation (PCM): Quantization, sampling, quantization error, digital transmission basics

  6. Digital modulation techniques: BPSK, QPSK, etc., error correction codes

  7. Communication networks: Network topologies, protocols, data transmission techniques

2. What is the weightage of Communication System Notes for JEE Main 2024?

The weightage of Communication Systems in JEE Main is around 3.33%, translating to roughly 1 question in the actual exam. Despite the seemingly low percentage, this section can be scoring due to the presence of direct and conceptual questions.

3. Which is the easiest JEE Main 2024 Communication System Notes topic?

While difficulty perception can be subjective, topics like analog modulation principles (AM, FM) and basic network types are often considered easier to grasp, especially with clear diagrams and examples.

4. What is the Communication System in the context of JEE Main 2024?

In JEE Main 2024, the Communication System delves into the principles of sending and receiving information efficiently over various channels. You'll learn about converting information into signals, transmitting them through channels like air or cables, and recovering the original information at the receiving end.

5. How can I apply the Communication System to solve JEE Main problems?

Apply Communication System principles to solve JEE Main problems by:

  • Understand the problem type: Is it related to modulation, noise, network analysis, etc.?

  • Identify relevant formulas and concepts: Recall key equations for SNR, bandwidth, signal characteristics, etc.

  • Apply the formulas and concepts to the specific problem: Plug in values, solve equations, and interpret the results.

  • Practice with diverse problems: Expose yourself to various question types to build expertise.

6. Are there any common mistakes students make in Communication System problems?

The common mistakes students make in Communication System problems are:

  • Confusing different modulation techniques

  • Misinterpreting noise and its impact

  • Applying formulas incorrectly or forgetting units

  • Ignoring the limitations of specific communication systems

  • Lack of clarity in network diagrams and analysis

7. Are JEE Main 2024 Communication System  Notes recommended for last-minute revision?

Communication System Notes can be valuable for last-minute revision, but prioritize topics based on their weightage and your understanding. Focus on key concepts, formulas, and problem-solving strategies instead of trying to cram everything.

8. What is modulation, and why is it used?

Modulation is the process of altering a high-frequency carrier signal (sine wave) with the information from the message signal. This allows efficient transmission of the message over the channel, overcoming limitations like bandwidth constraints and noise interference. Different modulation techniques exist, each with its own advantages and applications.

10. Is the concept of communication systems a hard topic in JEE Main 2023?

Students must feel positive about every topic that comes in the exam. They shouldn’t think about it easy or hard. The subjective capabilities of the students define the toughness of the subject for the student appearing in JEE Main. Therefore, a student should have a very balanced option and must focus more on evaluating their performance through question papers. They should build themselves up through reading the revision notes available on the Vedantu’s website. Moreover, one must stay motivated, and positive in spirit throughout the exam.