Software Defined Radio

SOFTWARE DEFINED RADIO [SDR]

[Here is an article on SDR compiled by my students Shijesh, Sibil, Shyju and John by browsing the internet, books and journals]

The rapid growth of technology and changing trends in the Communication techniques has paved way for the introduction of many telecommunication devices, many of which are not feasible to modify cost effectively due to lack of flexibility in their implementation. Software Defined Radio (SDR) technology mitigates this problem by providing the flexibility through software.

Software-Defined Radio (SDR) is a rapidly evolving technology that is receiving enormous recognition and generating widespread interest in the telecommunication industry. Over the last few years, analog radio systems are being replaced by digital radio systems and programmable hardware modules are increasingly being used in digital radio systems at different functional levels. SDR technology aims to take advantage of these programmable hardware modules to build open-architecture based radio system software.

An SDR system is a radio communication system where components that have typically been implemented in hardware are instead implemented using software on embedded computing devices. In other words SDR is a Radio in which some or all of the physical layer functions are software defined.

A Radio is any kind of device that wirelessly transmits or receives signals in the radio frequency (RF) part of the electromagnetic spectrum to facilitate the transfer of information.

In today's world, radios exist in a multitude of items such as cell phones, computers, car door openers, vehicles, and televisions.

While the concept of SDR is not new, the rapidly evolving capabilities of digital electronics are practical enabling many processes that were once only theoretically possible.

In the past, radio systems were designed to communicate using one or two waveforms [waveform here refers to any specific standard like Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), and Time Division Multiple Access (TDMA) or it can be as simple as Frequency or Amplitude Modulation (FM or AM)].

As a result, two groups of people with different types of traditional radio were not able to communicate due to incompatibility problems. The need to communicate with people using different types of equipment can only be solved using software programmable radios because of its flexible architecture.

Traditional hardware based radio devices limit cross-functionality and can only be modified through physical intervention. This results in higher production costs and minimal flexibility in supporting multiple waveform standards. By contrast, software defined radio technology provides an efficient and comparatively inexpensive solution to this problem, allowing multi-mode, multi-band and/or multi-functional wireless devices that can be enhanced using software upgrades

The primary goal of SDR is to replace as many analog components and hardwired digital VLSI devices of the transceiver (radio) as possible with programmable devices.

Some of the advantages of SDR are:

1. Multifunctionality. The same piece of hardware i.e. the radio set can be used to transmit, receive and process different communication signals that adhere to different air interface standards. This can be done simply by reconfiguring the software.
2. Global Mobility. The same piece of hardware i.e. the radio set can be used in different parts of the world that endorse different air interface standards. This can again be done simply by reconfiguring the software.
3. Compactness and power efficient design. Unlike traditional non-SDR systems, which require multiple hardware sets for multi-functional communication, the same piece of SDR hardware can be reduced for such a purpose. This results in compact and power –efficient design, especially as the number of systems increases.
4. Ease of manufacture. A SDR comprises of fewer hardware parts than a traditional radio since most processing is done in software within a general-purpose microprocessors or special purpose microprocessors like the DSP, or in reconfigurable hardware including FPGAs. This eases the production cycle for the manufacturer with lesser parts to standardize and produce.
5. Ease of upgrades. Any service upgrade can be easily introduced through the release of new software versions without the expense of recalling or replacing the hardware units. A user can simply download the software off the internet and load it into the SDR.

The most significant asset of SDR is versatility. Wireless systems employ protocols that vary from one service to another. Even in the same type of service, for example wireless fax, the protocol often differs from country to country. A single SDR set with an all-inclusive software repertoire can be used in any mode, anywhere in the world. Changing the service type, the mode, and/or the modulation protocol involves simply selecting and launching the requisite program, and making sure the batteries are adequately charged if portable operation is contemplated.

The ultimate goal of SDR engineers is to provide a single radio transceiver capable of playing the roles of GSM phone, CDMA phone, Wimax terminal, wireless fax, wireless Web browser, Global Positioning System (GPS) unit, and other functions still in the realm of science fiction.

VIKRAM KARVE

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© vikram karve., all rights reserved.

ART OF DISSERTATION

ART OF DISSERTATION

By

VIKRAM KARVE



I wrote a dissertation to earn my Masters Degree in Technology [M.Tech.] from IIT Delhi in 1983, and one more for my Post Graduation in Management in 1985. Since then I have supervised and guided dissertations, more than 40, maybe 50, chiefly for Masters Degrees in Engineering and Technology [ME / M. Tech.]. Some students of mine, who I am guiding at the moment, thought it apt than I pen down a few tips on the art of dissertation, so here are I am, writing a few lines, on The Art of Dissertation.


In a nutshell, the Art of Dissertation comprises the following simple steps:

1. Select a dissertation topic in a subject that you are knowledgeable about.

2. Compose a thesis statement that only asks a single question.

3. Employ a research methodology process that is compatible with your dissertation study.

4. Present your data evaluation, analysis and interpretation in an accurate, succinct, logical, well-reasoned and lucid manner and write your dissertation report in a simple, coherent manner conforming to the prescribed style.

5. Conclude your dissertation by answering the thesis statement and, if pertinent, mention corollaries and consequences and possibilities and scope for future research work on the subject.

6. Impart the finishing touches to your dissertation report – definitions, references, bibliography, abstract, summary, acknowledgement, certificate, contents and title pages.


WHAT IS A DISSERTATION?

A thesis is a hypothesis or conjecture. The word "thesis" is coined from the Greek derivative of the word meaning "position", and refers to an intellectual proposition. A thesis may be an unproved statement, a hypothetical proposition, put forward as a premise.

A dissertation is a lengthy, formal document that argues in defence of a particular thesis. The term "Dissertation" is derived from the Latin word dissertātiō, meaning "discourse" and is a document that presents the author's research and findings and, in most cases, is submitted in support of candidature for a degree or professional qualification. The research performed to support a thesis must be original and substantial. The dissertation must illustrate this aspect and highlight original contributions.

Your dissertation is your research which demonstrates your understanding of the subject in a clear manner. Therefore, it is imperative you find a topic that gives a clear picture of what you should write. Always ignore ambiguous and vague ideas. And, most importantly, choose an apt title – in fact, the title of your dissertation must fascinate you and entice your audience.


CHOOSE THE TYPE OF YOUR DISSERTATION

Dissertations are of two types - Empirical and Analytical.

Empirical dissertations make propositions resulting from experiments, involving laboratory or field research.

Analytical dissertations reflect propositions resulting from meticulous, pioneering and innovative analysis of previously published work.


WRITING YOUR DISSERTATION REPORT

A dissertation report may comprise the following main chapters:

1. Introduction- An overview of the problem; why it is important; a summary of extant work and, most important, the thesis statement.

2. Literature Review-the chapter that summarizes another work related to your topic.

3. Methodology-the part of the paper that introduces the procedures utilized for the research study and the conceptual model.

4. Data Presentation, Evaluation, Analysis and Interpretation -the chapter involves the presentation of computation values using statistical tools to support the claim.

5. Conclusion-the complete summary of the research findings.

Of course, you must include suitable pages for definitions, illustrations and graphs, footnotes and references, bibliography, abstract, summary, acknowledgement, certificates, contents and title pages.


Introduction

Dissertation writing chiefly involves the introduction, literature review, methodology and analysis chapters, and the others mentioned above. Having selected your dissertation topic, before you begin your dissertation you need to establish your thesis statement first.

A thesis statement is simply a single sentence that provides the main intention of the research. The thesis statement will epitomize the scope of your study, give you an idea of what you want to prove and will pilot your research.

A good thesis statement must satisfy the following four criteria:

1. The thesis statement must state your position.

2. The thesis statement must be able to support a discussion.

3. The thesis statement must be specific about its position.

4. The thesis statement should only have one single idea of discussion.

You must ponder over the following points while writing the introduction to your dissertation:

Is there any need to this dissertation study?
Why do it now? Why here? Why me?
Is the dissertation topic in my “comfort zone” and am I thirsty for knowledge and passionate about it?
Is there a problem? What is it? Why does it need to be solved? Should I approach it empirically or analytically?
What is my hypothesis? Is it original, novel, new, innovative?
Who will benefit from my dissertation work? In what sense will they benefit?
How will my contribution add to “commons”?
What is going to be my methodology? [modalities of data collection, evaluation, analysis, interpretation]
Are there any constraints or limitations in conduct of my proposed dissertation studies and research?


Dear Reader, I am feeling tired now, and will end this first part of my article here, but before I sign off, here is an interesting quote I read somewhere:

“The average Ph.D. thesis is nothing but the transference of bones from one graveyard to another.” – Frank J. Dobie.


[to be continued]


VIKRAM KARVE

Copyright © Vikram Karve 2008
Vikram Karve has asserted his right under the Copyright, Designs and Patents Act 1988 to be identified as the author of this work.


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happiness and pleasure

IT IS SIMPLE TO BE HAPPY

by

VIKRAM KARVE



The primary aim of philosophy and spirituality is to help ordinary people live a life of happiness, fulfillment and tranquility. Every day you ask yourself - How do I live a happy life? Is it simple to be happy? What is the art of happiness? Let us see what the Taoist philosopher Mingliaotse has to say: " The art of attaining happiness consists in keeping your pleasures mild."

You know that whenever pleasure is present you are happy - this is a fact that cannot be denied - for a pleasure is an enjoyable event or delightful emotion which is bound to make you happy, at least for that moment.

Highfalutin philosophers and spiritual gurus may prescribe various impracticable esoteric paths of renunciation, asceticism or sectarian precepts eschewing enjoyment and pleasure as the sine qua non of happiness, but the fact of the matter is that to the ordinary person happiness and pleasure are inextricably intertwined.

Discovering simple enduring pleasures which you can easily and regularly achieve, realize and enjoy in your day-to-day life will produce contentment, fulfillment and happiness.

No pleasure is a bad thing in itself, but wanton pursuit of pleasures is counterproductive as it leads to over-indulgence and excesses which bring with them disturbances which are detrimental to our happiness and well-being.

In your search for happiness you indulge in extravagant parties, unrestrained consumption, thoughtless shopping, limitless spending, expensive entertainments and try to enjoy everything at once, instant gratification by over-indulgence in wining, dining and dancing, stretching yourself to the maximum limits possible; at first you enjoy yourself and feel happy but when you come to the point of satiety you begin to feel a sense of repulsion, and if you overdo yourself, next morning wake up sick and feeling miserable with a sense of sadness rather than happiness.

Grandiose, complicated, ostentatious, lavish, unrestrained and intemperate indulgences which you think will ostensibly make you happy , in actual fact, render you stressed-out, unhappy and cause you harm and misery in the long run.

There is no need to overdo things in order to be happy. Just keep your pleasures mild. Enjoying a simple, tasty and healthy meal with your loved one's and friends, or just sitting quietly and leisurely reading a good book, taking a walk enjoying melodious music, enjoying your work, leisure, hobbies are some mild pleasures which will make you happy and keep you healthy too.

It is simple to be happy. The first thing you must do is to introspect and list your most pleasurable activities - things that give you true joy, happiness and satisfaction - in all aspects of your life. Make your list as exhaustive as possible and from this list select those "mild" pleasures that you can enjoy every day or often. And then fit them into your daily routine.

See what happens. Experiment. Delete those "pleasures" that you thought would give you happiness but actually made you stressed-out - things you think would be satisfying but turn out to be unrewarding. Do not be hesitant to add new items to your list - you can always remove them if they fail to produce the desired results. Fine tune and religiously practice your list - and experience happiness every day.

This prescription of keeping your pleasures mild will enable you to structure your life in way where your happiness will be in your control and you will find greater joy in your life. It will be feasible and within your control to ensure that you enjoy these mild pleasures daily or at least fairly regularly and, with only so many hours during the day, these enjoyable events will begin to crowd out the neutral, unpleasant, and irrelevant activities in your daily life and make you feel fulfilled and happy.

Dear reader, start today and discover the art of happiness, the art of living.

And do let me know your experience - did keeping your pleasures mild make you happier?

Try to discover which are those mild pleasures that make you truly happy and joyful.

It is simple to be happy, isn't it?


VIKRAM KARVE


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vikramkarve@hotmail.com

Telecom and IT Reference Book

Book Review by Vikram Waman Karve

TECH TERMS – What every Telecommunications and Digital Media Professional Should Know


Tell me, what is a zombie? No, no! It’s not the witchcraft zombie I’m talking about, nor am I referring to those automaton nerds, lost cases, you see around you. Okay, I’ll give you a hint – this zombie has got something to do with IT. Still clueless?

Did you know that Zombie refers to hackers’ use of other people’s personal computers to either conceal their online activities or to launch attacks on other computers? Once a computer has been turned into a “zombie” it can be used as a repository for illegal software, become a clandestine meeting place for hackers to conduct secret meetings, be used to send pornographic or other undesirable e-mail or spam, serve as the launching point for a denial of service attack, and so on – all without the knowledge of the zombie computer’s owner. So don’t let your PC become a zombie.

Did you know all this? Well, I didn’t – till I read a marvellous book, a splendid Technical Thesaurus, called TECH TERMS. This book is packed with a wealth of knowledge comprising must-know terms and concepts for every Telecom and IT professionals worth her salt. This book encapsulates an essential list of Internet, IT, Telecom, Digital, Broadcasting, and Computing terms one needs to master to remain current through thorough understanding of state-of-the-art technology and concepts – a sine qua non for survival and success in the rapidly advancing world of Telecommunications and Information Technology.

Title: TECH TERMS – What every Telecommunications and Digital Media Professional Should Know

Author: Jeff Rutenbeck

Elsevier (2006) 280 pp

ISBN 13: 978-0-240-80757-7

The “tech terms” are arranged alphabetically and each term is assigned a “level” of 1, 2, or 3 indicating the degree to which a term or concept can be considered fundamental or foundational to a particular technological domain [level 1], those which require some understanding [level 2], and highly specialized or complicated concepts [level 3].

Cyberspace, Blog, Hacker, Byte, Broadband, iPod, Database are level 1 terms; Technobabble, TCP/IP, GPS, GSM, ADSL, ISDN, Cybersquatting, Wiki, Bluetooth, Blu-Ray, Ethernet, URL, Router, Zombie, Honeypot, WYSIWYG, Nanotechnology are level 2 terms, and terms and concepts like CDMA, NICAM, CPDP, XSS, DLL, ColdFusion are level 3 terms.

Hey, do you know the full form of URL? Or USB? Or FIFO? Or ISDN?

Why don’t you just go down to your nearest bookstore or library and get a copy of this book? TECH TERMS is an excellent reference book, a must-have for all IT Pros in today’s techno-centric world.


[Reviewed by VIKRAM WAMAN KARVE]


http://vikramkarve.sulekha.com

http://www.linkedin.com/in/karve

http://www.ryze.com/go/karve


vikramkarve@sify.com

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Book Review by Vikram Karve - Tech Terms

http://vikramkarve.sulekha.com/blog/post/2008/02/a-must-read-reference-for-all-techies.htm

Tech Terms

Book Review by Vikram Waman Karve



TECH TERMS – What every Telecommunications and Digital Media Professional Should Know





Tell me, what is a zombie? No, no! It’s not the witchcraft zombie I’m talking about, nor am I referring to those automaton nerds, lost cases, you see around you. Okay, I’ll give you a hint – this zombie has got something to do with IT. Still clueless?


Did you know that Zombie refers to hackers’ use of other people’s personal computers to either conceal their online activities or to launch attacks on other computers? Once a computer has been turned into a “zombie” it can be used as a repository for illegal software, become a clandestine meeting place for hackers to conduct secret meetings, be used to send pornographic or other undesirable e-mail or spam, serve as the launching point for a denial of service attack, and so on – all without the knowledge of the zombie computer’s owner. So don’t let your PC become a zombie.



Did you know all this? Well, I didn’t – till I read a marvellous book, a splendid Technical Thesaurus, called TECH TERMS. This book is packed with a wealth of knowledge comprising must-know terms and concepts for every Telecom and IT professionals worth her salt. This book encapsulates an essential list of Internet, IT, Telecom, Digital, Broadcasting, and Computing terms one needs to master to remain current through thorough understanding of state-of-the-art technology and concepts – a sine qua non for survival and success in the rapidly advancing world of Telecommunications and Information Technology.



Title: TECH TERMS – What every Telecommunications and Digital Media Professional Should Know



Author: Jeff Rutenbeck



Elsevier (2006) 280 pp



ISBN 13: 978-0-240-80757-7



The “tech terms” are arranged alphabetically and each term is assigned a “level” of 1, 2, or 3 indicating the degree to which a term or concept can be considered fundamental or foundational to a particular technological domain [level 1], those which require some understanding [level 2], and highly specialized or complicated concepts [level 3].



Cyberspace, Blog, Hacker, Byte, Broadband, iPod, Database are level 1 terms; Technobabble, TCP/IP, GPS, GSM, ADSL, ISDN, Cybersquatting, Wiki, Bluetooth, Blu-Ray, Ethernet, URL, Router, Zombie, Honeypot, WYSIWYG, Nanotechnology are level 2 terms, and terms and concepts like CDMA, NICAM, CPDP, XSS, DLL, ColdFusion are level 3 terms.



Hey, do you know the full form of URL? Or USB? Or FIFO? Or ISDN?



Why don’t you just go down to your nearest bookstore or library and get a copy of this book?

TECH TERMS is an excellent reference book, a must-have for all IT Pros in today’s techno-centric world.




[Reviewed by VIKRAM WAMAN KARVE]





http://vikramkarve.sulekha.com



http://www.linkedin.com/in/karve



http://www.ryze.com/go/karve





vikramkarve@sify.com



vikramkarve@hotmail.com