About

Hello and welcome to Wireless Pi.

I am Qasim Chaudhari from Melbourne, Australia. I have a PhD in Electrical Engineering from Texas A&M University, USA.

My favorite subject at school was geometry. It really came alive to me – above and beyond what can be captured by the language of mathematics.

Later, I found the same love in signals. Playing with them in order to transmit information from point A to point B could be rooted in mathematics but should be transcended to an instinctive level. This is my attempt to achieve that purpose.

——–There are two main purposes of my writing:

  1. To explain technical concepts through beautiful figures and without complicated mathematical details.
  2. To bring a human touch to the reader, as opposed to the traditional approach that technical writing must be boring and mechanical.

On this website, you will find articles on wireless communications starting from a very basic level.

Today with the proliferation of IoT, connected cars and machine-to-machine communications, there is a greater interest than ever to understand the physical layer design of digital communication systems in general and wireless communication systems in particular. The following two parts of Wireless Communications – From the Ground Up help accomplish this goal.

Volume 1 – Fundamentals of Digital Communication Systems

—————-If you are a technical person, student in communications or computing areas, amateur-radio enthusiast or a hobbyist, you would have found that the mainstream textbooks on this topic are filled with heavy mathematical details. That makes the field of wireless communication an exclusive membership club for those who can understand

  • Several types of frequency variables and their corresponding Fourier transforms as well as different types of Fourier series, not to mention numerous connections among all of them
  • Probability and random processes
  • Detection and estimation theories

and so on.

In my opinion, understanding wireless systems can be made simpler than that. Here, you can bypass the mathematical rigor that creates difficulty for non-specialists. This text is a simple way for you to enter at the beginner level and make your way up to the advanced wireless system design. Mathematics is included at a school level. I rely more on visualizing equations through beautiful figures. Therefore, you will encounter numerous figures throughout the text with logical and intuitive explanations.

But you will NOT encounter any integrals, probability theory and detection/estimation theory. You will NOT even find any e or j of complex numbers either. The most complicated notation I have used is \sum _{n=N1} ^{N2} which basically means “sum everything from N1 to N2 (basically, I have taken the liberty to explain simply what is backed by rigorous formalism elsewhere).

Can digital and wireless communications still be understood? Read the book to find out.

Volume 2 – Synchronization, Equalization and Receiver DSP Design

—————-If you are a practicing engineer, there is a lot of information to help in understanding signal processing aspects of the system design about areas not covered in traditional texts such as

  • Synchronization (timing, carrier frequency and phase, frame)
  • Equalization
  • Overall receiver signal processing algorithms design and partition

which form the core of the actual system.

You can enter your email address below to receive a notification when Volume 2 is complete.


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