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Qasim Chaudhari

Qasim Chaudhari is an independent consultant and trainer with expertise in wireless communications, Software Defined Radio (SDR) and Digital Signal Processing (DSP). He obtained a PhD in Electrical Engineering from Texas A&M University and worked at various organizations including Qualcomm, Renzym and Center for Energy Efficient Telecommunications. He has developed and implemented DSP algorithms for real world demonstrations of many wireless systems such as a MIMO-OFDM testbed, low-SNR receivers and phase of arrival based localization. As the founder of https://wirelesspi.com, his focus is on explaining concepts through beautiful figures, simple mathematics and intuitive reasoning. He is an author of two books, Wireless Communications from the Ground Up - An SDR Perspective (along with a video course with practical exercises to implement the concepts) and 5G Physical Layer - An Easy Guide to Key Technologies. You can reach him at info@wirelesspi.com.

Signal Processing in FMCW Radars

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FMCW radars are widely used in short range applications such as autonomous vehicles, heartbeat monitoring, vibration measurement in residential and industrial products, drones ranging and intrusion detection. Building the main concepts from the ground up, I will describe in detail FMCW waveform design, FFT processing and the utility of radar date cube that covers all three dimensions, namely range, Doppler and angle. The talk will conclude with practical tips for designing an FMCW radar system.

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Beamforming in 5G Cellular Systems: A Tutorial

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Cellular networks have to minimize the interference among network users in addition to maximizing their individual data rates. From this perspective, beamforming is the core technology behind the design of the 5G physical layer. In this tutorial, we start from the basic signals and build the fundamental ideas on which physical and virtual beamforming methodologies are based. We will explore how its integration with massive MIMO leads to a simple yet efficient system. No prior DSP knowledge is required to understand the concepts.

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Live Q&A with Qasim Chaudhari - Beamforming in 5G Cellular Systems: A Tutorial

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Live Q&A with Qasim Chaudhari about his talk titled "Beamforming in 5G Cellular Systems: A Tutorial"

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Timing Synchronization in Software Defined Radios (SDR) (2020)

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A Software Defined Radio (SDR) merges the two fields of digital communication and digital signal processing into an efficient implementation of transmitters and receivers. One outcome of this combination is an interesting perspective on how timing synchronization is performed in digital communication receivers. This session will explain the timing synchronization problem in both time and frequency domains and then discuss in detail a timing locked loop consisting of timing error detectors, loop filter, interpolation and interpolation control. Insights into the relation of timing synchronization with general receiver design will also be presented.

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