Qasim Chaudhari Blog on DSPRelated.com
https://www.dsprelated.com/blogs-1/nf/Qasim_Chaudhari.php
Qasim Chaudhari Blog on DSPRelated.com
https://www.dsprelated.com/blogs-1/nf/Qasim_Chaudhari.php
https://d23s79tivgl8me.cloudfront.net/user/profilepictures/56837.jpgen-USMon, 25 Sep 2017 22:19:38 +00001506377978A Beginner's Guide to OFDM
https://www.dsprelated.com/showarticle/1046.php
In the recent past, high data rate wireless communications is often considered synonymous to an Orthogonal Frequency Division Multiplexing (OFDM) system. OFDM is a special case of multi-carrier communication as opposed to a conventional single-carrier system.

The concepts on which OFDM is based are so simple that almost everyone in the wireless community is a technical expert in this...]]>
Mon, 01 May 2017 07:02:27 +0000Qasim ChaudhariMinimum Shift Keying (MSK) - A Tutorial
https://www.dsprelated.com/showarticle/1016.php
Minimum Shift Keying (MSK) is one of the most spectrally efficient modulation schemes available. Due to its constant envelope, it is resilient to non-linear distortion and was therefore chosen as the modulation technique for the GSM cell phone standard.

MSK is a special case of Continuous-Phase Frequency Shift Keying (CPFSK) which is a special case of a general class of modulation schemes...]]>
Wed, 25 Jan 2017 06:38:24 +0000Qasim ChaudhariSome Thoughts on Sampling
https://www.dsprelated.com/showarticle/1014.php
Some time ago, I came across an interesting problem. In the explanation of sampling process, a representation of impulse sampling shown in Figure 1 below is illustrated in almost every textbook on DSP and communications. The question is: how is it possible that during sampling, the frequency axis gets scaled by $1/T_s$ -- a very large number? For an ADC operating at 10 MHz for example, the...]]>Tue, 15 Nov 2016 11:48:56 +0000Qasim Chaudhari