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Overview
Hello and a warm welcome to Wireless Pi by Qasim Chaudhari. For any topic, true understanding begins with the fundamentals. Like real numbers–just when we think we understand 0 and 1, we discover 0.5 in between, then 0.25, and so on.
News
Demodulating P25 CQPSK Signals Using a C4FM Receiver
Usually a modulation of one species can only be demodulated with the radio signal processing chain of the same species. But P25 has a very interesting and unusual concept of demodulating a signal from one modulation species using the receiver of another s
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An Intuitive View of Time-Bandwidth Product (TBP)
Time-Bandwidth Product (TBP) of a waveform is a foundational term frequently used in communications and radar community. However, I have never seen any book or online resource explain the core idea in an intuitive manner. Even though I understood the conc
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DSP Recipes
For the past few years, I have been writing articles on digital signal processing, wireless communications, and software-defined radios on this website that reach hundreds of thousands of readers across the globe every year. Over time, many suggested that
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Two Birds with One Tone: I/Q Signals and Fourier Transform - Part 2
In Part 1 of I/Q signals series, we saw the implications of orthogonality in amplitude and phase shift. This led to our treatment of signals as two dimensional complex numbers in time I/Q plane. Now we talk about orthogonality in frequency, how it gives r
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Two Birds with One Tone: I/Q Signals and Fourier Transform - Part 1
When a new member arrives at the Signal Processing Club, this is what they find at the club gate: I/Q signals. Perhaps a secret plot to keep most people out of the party? Some return from here to try another area (e.g., machine learning, which pays more a
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