Digital communications

By : Vandana Tanwar

Updated : Feb 4, 2021, 13:01

Digital communications topics for GATE ECE covers communication techniques, digital transmission, digital radio, transmission circuits, and lines, all of which are essential elements that one needs to know about in detail. It is an important topic for a number of competitive examinations such as GATE, ECE, ECS, ISRO, and other such entrance tests.

In a rapidly getting digitalised world, would-be computer and software engineers must have an in-depth fundamental knowledge of Digital communications for computer science to clear the entrance examination with high marks and get their preferred stream of engineering to study further. Today we will talk about how it is important to refer to relevant Digital communications notes for ECE to prepare properly for the examination.

Important Digital communications topics for GATE 



Elements of Digital Communication

Digital communication elements include the source of information, source, encoder, channel encoder, modulator, channel, demodulator, Binary Stream, Channel Decoder, Source Decoder, and Use of Information.


Quantifying is about using a finite set of amplitude levels. There are two types – a uniform and a non-uniform quantizer.

Digital Modulation Schemes

Using these schemes, analog audio and video signals can be transmitted in digital format. The commonly used digital modulation schemes include ASK, FSK, and PSK.


Any unwanted energy that interferes with the correct reception and reproduction of signals. There are two types of noise – external and internal.


It is a technique where multiple signals are combined to form a composite signal and transmitted over a common channel.

Introduction to Coding Techniques

Error-detecting codes are codes that can detect errors, and ones that can correct the errors are called error-detecting codes.

Random process and variables

A random process is the extension of a random variable that is not entirely predictable. The Random process is the outcome mapped to a random waveform, while a random variable is an outcome mapped to a number.

Tips to Solve Digital communications GATE questions

  • The first tip is to find the right online platform that can offer excellent Digital communications notes for GATE in PDF. With the right notes, you can prepare exhaustively and acquire complete know-how of the topic.
  • The second tip is to revise through the previous year's Digital communications GATE questions and answers in PDF. As they say, practice makes a man perfect – you need to follow this phrase with sincerity and dedication.
  • The third tip is to attempt and participate in the Digital communications quiz as many times as possible. It helps the candidate brush-up their knowledge because these Digital communications online tests are prepared by subject-matter experts. You also get to understand clearly the status of your preparation for the topic.
  • Ensure that you download the Digital communications study material for GATE ECE and reference books from a leading online education platform to reinforce your knowledge with each revision.

 Importance of Digital communications for GATE ECE

  • Digital Communication has a lot of weightage, just like any other topic in the GATE ECE Paper.
  • Topics like Boolean algebra, K-Map, CMOS implementation, Combinational and Sequential Circuits, and Counters are significant for studying other advanced topics in this domain. That is why it is imperative to study from Digital communications GATE notes.
  • Questions in GATE from the topics mentioned above feature every year. The other important topics include – counters, ADC, DAC. Memories, Data Conversion Circuits.
  • Digital Communication is a subject that is growing in importance every day with the latest digital technology advancements. That is why computer engineers need to have their basics clear, making this topic so important.

Most Recommended Digital Communications Books

These are the books that you must refer to for preparing this topic for the GATE examination.

Name of the book and author


Digital Communication

John G. Proakis, Masoud Salehi

Digital Communication

P Rao

Digital Communication

Simon S. Haykin

Why prepare Digital Communication from BYJU'S Exam Prep?

BYJU'S Exam Prep is a cutting-edge and innovative digital platform that enables students to prepare for competitive exams like GATE. It facilitates better preparation with its online resources in the form of Digital communications notes for GATE in PDF, Digital communications MCQ questions, tests and assessments, previous year questions, and Digital communications MCQ in pdf, Digital communications online quiz, and more. The study material, quizzes, tests, and assignments are all created by experts from the field with sound engineering knowledge. GATE subject-matter experts also address the previous year's questions and solved answers.


Q. How can the SQNR be improved?

SQNR can be improved by enhancing the sampling rate.

Q.How is shot noise produced?

Shot noise is produced due to the behaviour of electrons and photons.

Q. What are the advantages of digital circuits?

Digital circuits have minimal noise and distortion and less interference.

Q. What is the code rate?

The code rate is the ratio of k bits to total bits in a sequence, n.

Q. What does a modulation channel consist of?

Modulation channels consist of amplifiers and signal processing units.