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MATLAB : Fourier transform

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By Nuno Nogueira, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=3912826 MATLAB has been  crucial programming language across worldwide that let us express matrix and array mathematics directly. In signal processing and communication it plays vital role in analysing and exploring time series data in time domain or frequency domain. For analysing non periodic signals in frequency domain we use Fourier transform instead of Fourier series ,which is used to express periodic signals in terms of infinite sum of sinusoidal terms .   Fourier transform can exist for :      1. Energy signals      2. Power signals       3. Impulse signals  That means absolutely integrable signals can have their Fourier transform only.  Formula for Fourier transform;   Then its come to use Fourier transform in MATLAB. So here is the code for Fourier transform of sinusoidal wave , for any other signal we ...
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How contact tracing can be potential weapon against COVID-19?

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How contact tracing can be potential weapon against COVID-19?

 Currently, the entire world is struggling with pandemic COVID-19 and looking for some majors to curb it's spreading and it's treatment. Contacts tracing is one of the major to stop it's spreading. Contact tracing is a simple concept that is vital to stopping the spread of deadly infectious diseases like COVID-19. It follows three steps in order to prevent the spread of the virus:
    1. Contact Identification
    2. Contact Listing
    3. Contact follow-up

  Firstly, it identifies the infected person and recognises the symptoms of diseases and then list out the all the contacts to whom infected person meet in their past daily routine and contact them in order to know whether they are infected or not. And if necessary the exposed contacts are self quarantined or diagnosed. In fact, digital contact tracing has already been implemented by millions of users apparently to good effects.

Bluetooth Beacons:-

All mobile phones have Bluetooth technology which is a wireless system that uses radio waves for communication purposes. Bluetooth has a short range of 30 feet by design for good reception. Bluetooth can pair with other Bluetooth enabled devices to share data. This way it is helpful in sharing the unique code in order to track COVID-19.

Working:-

This system records another phone that has been nearby. As long as this system is running our phone will periodically send out a small unique piece of code derived from that phone's unique I'd. Another phone in range receive that code and remember it. When a person using the system receives a +ve diagnosis they can choose to submit their I'd to a central database. When we get close enough to get infected our phones scan the database to find the match of IDs. If there's a match they will send us an alert signal.

 Giant companies like Apple and Google already collaborated for working on this system and can prove as a major potential against COVID 19. Countries like Singapore and South Korea took control over this pandemic through contact tracing and we are looking hopefully towards this system for India also.

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