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The spiritual journey is a journey towards clarity, but never towards certainty. When you draw conclusions about beginnings and endings, you are a believer. When you accept that you really do not know anything, you become a seeker. To be enlightened is not a condition of certainty. It is to move from limited knowing to boundless unknowing, from gravitas to grace.

Yogic science is a realm where science turns subjective, where fact and fable, poetry and profundity, magic and logic become inextricable.

An identified intellect leaves you with a completely distorted experience of reality. The human struggle is just this: you are unwilling to shake off the bits and pieces of knowledge you have acquired because these give you some sense of security and identity. For a tiny bit of knowledge, you are giving up the cosmos!

To know the life in its entirety, one has to become one with it — not cerebrally, but experientially. Through only knowing, not knowledge. Knowledge is intellectual accumulation; it is information gathered and processed in bits and pieces. Knowing, on the other hand, is neither intellectual nor accumulative.

Being that which is not is the most auspicious thing, this is because you can find fault ‘that which is ‘. You can like it or dislike it; you can agree with it or disagree with it; but ‘that which is not’ is perfect. ‘That which is not’ is the most auspicious, because nobody can find fault with it.

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One day a bull was grazing in the field  and a pheasant was picking out the ticks off the bull’s body. They are used to each other; they are sort of friends, so it’s going on.  Then the pheasant became nostalgic and said, “when I was young, I could fly and sit on the topmost branch of the big tree out there, but now I can’t even get to the first branch”.  The bull said nonchalantly, “Oh! what’s the problem? Just eat my dung, and it will give you all the nourishment that you need to go to the topmost branch”.  The pheasant said, “Really? You mean just eating your droppings will get me to the top of the tree?” “Yes, try and see!” he replied.  So the pheasant hesitantly ate some of the dung, and that very day he flew up to the first branch! Every day, he started eating more and more of the dung. In about a fortnight’s time, it reached the topmost branch, and went and sat there. The pheasant was so thrilled, having eaten this dung and being able to sit on the topmost branch. Now when the farmer, who was sitting on his balcony, saw this fat pheasant sitting on the topmost branch of the tree, he just pulled out his shotgun and shot the pheasant off the tree!

The moral of the story is: bullshit may get you to the top but it will never let you stay there…!
Source: Mystic Musings – Sadhguru!

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Data rate is same as single carrier modulation. But when the coherence bandwidth is less than the bandwidth of the signal (in case of wide-band channels), single carrier modulation suffers from inter symbol interference (ISI).  Whereas in multi-carrier modulation the bandwidth is divided into sub-carriers with bandwidth less than the coherence bandwidth; it’s more like converting wide-band into narrow band channels.

Thus OFDM converts frequency selective fading channel into flat fading channel.

Since multi-carrier modulation requires many modulators/demodulators for the transmission of the data, OFDM comes with IDFT (done by IFFT) which maps the data onto the respective sub-carrier, and can be transmitted.

A ZP–OFDM system has lower transmission power and a simpler transmitter structure. Unfortunately, the ZP–OFDM scheme introduces ICI, as the orthogonality among subcarriers is destroyed when multiple
copies of the time-shifted ZP–OFDM waveform are received. To remove ICI, cyclic
prefixing (CP) transmission is preferred.

Cyclic prefix converts the linear convolution into circular convolution, thus DFT can be invoked on the received signal.

In MIMO-OFDM each transmit antenna implements OFDM and transmit.  Say, we have 4 antennas and 256*4 symbols to transmit, divide the 256 into 4 sets; and implement OFDM using the 256 sub-carriers at each antenna and transmit.

OFDM has high PAPR, which results in the non-linear region of the amplifier (in IFFT block).  Thus high PAPR makes OFDM loses its properties such as orthogonality of the carriers.

Equalization at the receiver is done to mitigate the ISI, equalizers such as ZF equalizer, MMSE, decision feedback equalizer (check Goldsmith’s book) are used.

[draft]

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This is the day when I met Ramachandra Guha, a historian and biographer, at IISc Bangalore.  I was completely enthralled and engrossed in reading his most acclaimed book India After Gandhi; it was first historical, non-fiction and a colossal book that I read.  Below is the autographed copy of the book by Guha.

Book autographed by Guha.
Book autographed by Guha.

 

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I recently picked up interest in reading books, mostly non-fiction, biographies ,and some philosophical stuff.  I found the following interesting fable on quora on why reading is so important, and hence, sharing it here on my blog!

An old farmer lived on a farm in the mountains with his young grandson. Each morning Grandpa was up early sitting at the kitchen table reading his book. One day the grandson asked, “Grandpa! I try to read the book just like you but I don’t understand it, and what I do understand I forget as soon
as I close the book. What good does reading the book do?”

The grandfather quietly turned from putting coal in the stove and replied, “Take this coal basket down to the river and bring me back a basket of water.”

The boy did as he was told, but all the water leaked out before he got back to the house. The grandfather laughed and said, “You’ll have to move a little faster next time,” and sent him back to the river with the basket to try again. This time the boy ran faster, but again the basket was empty before he returned home. Out of breath, he told his grandfather that it was impossible to carry water in a basket, and he went to get a bucket instead.  The old man said, “I don’t want a bucket of water; I want a basket of water. You’re just not trying hard enough,” and he went out the door to watch the boy try
again. At this point, the boy knew it was impossible, but he wanted to show his grandfather that even if he ran as fast as he could, the water would leak out before he got back to the house.  The boy again dipped the basket into the river and ran hard, but when he reached his grandfather the basket was
again empty. Out of breath, he said, “See Grandpa, it’s  useless!”

“So you think it is useless?” the old man said, “Look at the basket.” The boy looked at the basket and for the first time realized that the basket was different. It had been transformed from a dirty old coal basket and was now clean, inside and out.

Son, that’s what happens when you read the book. You might not understand or remember everything, but when you read it, you will be changed, inside and out!

demotivation.us_Books-That-is-exactly-how-they-work_130580980657

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2014 Batch
2014 Batch

Batch of 2014 IIT Madras Electrical Sciences.

Btech
2014-Batch of IIT Madras, Electrical B.Tech

 

Electrical Batch of 2014 IIT Madras.
Batch of Electrical Sciences, 2014 IIT Madras.

Wing mates of Narmada Hostel, IIT Madras.

 

Wingmates of Narmada Hostel, IIT Madras.
Wingmates of Narmada Hostel, IIT Madras.

Hostel night…

Hostel night with wingmates
Hostel night with wingmates
A selfie...
A selfie…

Another selfie…

20140416_151418

Finally,

Myself...
Myself…

 

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Presented my paper titled “Recent Trends in Future Proof Access Passive Networks: GPON and WDM PON” in 4th International Conference on Recent Trends in Information Technology on April 10th 2014, along with my friend Abhinov in Chennai at MIT.

It was an experience which I never had before.  Finally, savored the poster presentation at ICRTIT.

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There are whopping number of papers (technical papers) getting published each day.  Gazillion conferences each day.  I really wonder how people get their work published.  Is it not so ridiculous publishing material which lacks quality and genuinity.  Let’s forget the quality for the time being..how about publishing a material which is a replica or plagiarized from other papers (of course they too are meagre)….?

More often than not, I see people going bananas for getting the paper published.  I do not really understand this, it is astounding to see the professors doing the same…what do they aim at while publishing? fame? reputation of the institute?…?

There are people who see  only the number of publications…and get things done…don’t they know how things work?

There are people who negotiates that more number of publications implies good research..and there are people who argues more number of Ph.D implies high quality research…is it not so ridiculous…This is highly pathetic…anyway, all I could do is to just wear a smile….

But, there are people who really do good quality work and get their work published in a reputed journals….they don’t unless there is a significant amount of work…..

Reputed journals,  there are journals where one can get their work published if the corresponding or co-author is a reputed/elevated person, no matter what the recent publishing work it is….

or if one does not belong to anyone of the aforementioned authors…still you can get your work published by volunteering the organization in the form of money.  I really wonder why those journals ask for volunteering (money of course) while submission of the manuscript but why not after getting it accepted/rejected? what does this imply….?

Anyway, so why am I writing all this and why today….? well, because today, my paper has been accepted for a conference xyz…and will be published in xxxxxx.  🙂

Satya.

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If life is not what all think it is but it is of lot more wise, then perhaps I am having my life.  In the recent times, it is highly difficult to live ones life according to the way he/she wants.

But, in my case, I am pretty much living the way I want. Though, I am not very certain of what I want ;).. at times the surrounding environment influences my thinking which further leads to huge mess, chaos.

So much of unfounded speculations have been taking place in my life.

Since many days, I have been thinking of doing a doctoral program in Taiwan.  Thinking that it is highly impossible for me to get into a university at Taiwan, I aimed at it.

I realized that I have been living in an utopian world, and I lived my life through illusion. The real world now is much more intricate than it actually looks…and I am enjoying every bit of it. Knowing the reality is the ultimate thing and one must embrace it.

There are many decisions taken hastily in recent times..sometimes like Ph.D in Taiwan, sometimes work as an RA…..woaah..chaos everywhere.  Anyway the former is ruled out considering many factors.  So, I finally decided no matter what happens I shall try to avoid knee-jerk reactions and must face the stumbling blocks, and fight with fortitude.

And whatever the work I do, do the good work…and try to be a good human being, after all that is what I am in the very first place..

While in this altercation, I must thank my adviser M Suneel sir and friend Abhinov for being supportive and sharing their opinions.

Finally, Happy Holi…..let’s have a colorful life…..

Satya.