Different techniques of spread spectrum

Different techniques of spread spectrum CHAPTER 1 INTRODUCTION: The idea of this project is to study different techniques of spread spectrum. These techniques include the two processes of direct-sequence spread spectrum and frequency hopping spread spectrum. Both these techniques will be simulated in software called MATLAB. Also a brief mention will be there about the multiple access property of spread spectrum. This project deals with the implementation of spread spectrum using the techniques- direct sequence spread spectrum and frequency hopping spread spectrum. Spread spectrum is a new method of communication. It provides a jam-free network and prevents any kind on interference. It helps to provide immunity to channels by not allowing any kind of interference or disturbance. We will be discussing more about spread spectrum and its technique in the following chapters. The project has been divided into six chapters. The second chapter deals with spread spectrum. It starts of with the history of spread spectrum followed by a basic definition of spread spectrum. Certain characteristics of spread spectrum are discussed along with a mathematical explanation of advantage of spread spectrum over narrow band communication. It then describes the working of a spread spectrum and finally mentions how a spread spectrum can be demodulated. Chapter three describes different techniques of spread spectrum. There are four techniques of spread spectrum namely direct sequence spread spectrum (DSSS), frequency hopping spread spectrum (FHSS), chirp spread spectrum (CSSS) and time hopping spread spectrum (THSS). Each of these techniques is described, with a brief mention about its basic mechanism.A brief comparison is drawn between FHSS AND DHSS. A mathematical explanation is given for DSSS under the conditions of noise (jammer). Chapter four discusses different multiple accesses of spread spectrum. These are frequency domain multiple access (FDMA), time division multiple access(TDMA) and code division multiple access(CDMA). CDMA is dealt with in a more detail manner and is presented with a mathematical explanation. Chapter five presents a MATLAB simulation of direct sequence spread spectrum (DSSS), Frequency hopping spread spectrum (FHSS) and Code division multiple access (CDMA). It discusses how a signal when multiplied with a pseudo random noise and put on a frequency wave gets spread. This technique is called direct sequence spread spectrum. Also this chapter presents the MATLAB simulation of Frequency Hopping Spread Spectrum where four randomly carrier frequency waves are generated to form a spread spectrum and multiplied with pseudo random generator to determine the frequencies where the information has to be hopped. The information is sent in the form of a BPSK modulated signal. Also a MATLAB simulation on CDMA is presented .It basically shows how CDMA works. Three stations are taken and how they send codes through a single channel by using the property the CDMA. Finally, chapter six winds up the project with the conclusion from each chapter. It mentions in short what has been realized from this project. CHAPTER 2 SPREAD SPECTRUM 2.1 HISTORY OF SPREAD SPECTRUM This chapter talks about spread spectrum. It begins with a brief history behind spread spectrum. It also mentions about the various fields where spread spectrum is being effectively used. Certain characteristics of spread spectrum are also discussed.A basic definition of spread spectrum is discussed in this chapter which basically explains what actually spread spectrum and why is preferred over conventional wireless communication. A brief mechanism of how spread spectrum works is discussed. It also mentions the mathematical reason behind why a spread signal is an effective way to communicate. A comparison is drawn between spread spectrum transmission and fixed frequency transmission. Finally a demodulation technique is discussed mentioning about how demodulation can be achieved. Spread spectrum has become a new commercial communication technique over the past 8-9 years. However the first intentional use of Spread Spectrum came during the period of 1921-1930 by Armstrong. He had used wideband Frequency Modulation. The real use for Spread Spectrum how ever came in World War II. Both the allies and the Axis powers experimented with simple Spread Spectrum systems. The first publically patent on Spread Spectrum came from Hedy Lamarr, the Hollywood movie actress, and George Antheil, an avant gard composer. Lamarr had mentioned to Antheil about her idea for a Secret Communications System that could guide torpedoes to their target without being intercepted by the enemy. This could be done by sending messages between transmitter and receiver over multiple radio frequencies in a varied random pattern. The message would be transmitted at such a high rate that no one would be able to decode it. They sent their invention to National Inventors Council. Instead of developing the patent commercially, they gave it away to the government for the war effort. As a result of which the commercial use of Spread spectrum came many years later [1, 3, 19]. Spread Spectrum was first used for commercial purposes in the 1980s when Equatorial Communications of Mountain View used Direct Sequence for multiple access communications over synchronous satellite transponders [1]. Today, spread spectrum is being used to provide communications in a variety of commercial applications, including mobile communications and interoffice wireless communications. In the coming years hardly anyone will prevent themselves from being involved in one way or the other with spread spectrum communications as it will become an integral part of the communication world. [1, 4]. 2.2 DEFINITION OF SPREAD SPECTRUM Spread-spectrum is a technique by which electromagnetic energy produced over a particular bandwidth is spread in the frequency domain on purpose. Spread spectrum signals are used for transmission of digital information which are characterized by the fact that their bandwidth W is much greater than the information rate R in bits/sec. Hence the bandwidth expansion factor is always greater than unity. This results to provide a signal with a wider bandwidth and a lower power density. These techniques are used for a variety of reasons which include the establishment of secure communications, increasing resistance to natural interference and to limit the power flux density on satellite downlinks. Narrow band signal and spread spectrum use the same amount of power to transmit the same data. However the power density of the spread spectrum is lower as compared to narrow band and it is this property that makes spread spectrum achieve secure and jam free communication. Spread spectrum is a type of wireless communication in which the frequency of the transmitted signal is intentionally varied and changed to achieve a higher bandwidth. This results to provide a much greater bandwidth than that of the signal if its frequency was not altered [2, 5]. A spread spectrum should full fill the following requirements: 1) The message signal should undergo two modulations that produce the wideband spectrum having bandwidth much in excess of the minimum bandwidth needed to send the message. 2) The spreading ,that is the second modulation is caused by means of a spreading signal 3) The receiver should recover the message by the method of de-spreading the signal that is received by using the same spreading signal [23]. Spread spectrum is preferred over conventional wireless communication for many reasons; however there are at least a couple of problems associated with conventional wireless communication. First, a signal whose frequency is constant and not changing is subject to interference. This condition occurs when another signal is sent on, or very near to the frequency of the desired signal. Interference can be accidental (as in the case of amateur-radio communications) or it can be deliberate like during war time. Second, a constant-frequency signal is very easy to intercept or lock and reveal the information it is carrying and hence is not well preferred to applications where the information must remain confidential between the transmitter and receiver. [2]. To minimize troubles and to maintain the confidentiality of the information, transmitted signals frequency can be deliberately varied and changed over the large segment of the electromagnetic radiation spectrum. This variation is done by using a specific and complicated mathematical function. This function is the most important part of the spread spectrum for maintaining the confidentiality. For intercepting the signal, the receiver must be tuned to frequencies that vary exactly to this function. The receiver must have the knowledge of the frequency-versus-time function employed by the transmitter, and must also be provided with the information about the starting-time point of the function. If someone wants to hack or intercept the spread-spectrum signal, that person must possess a transmitter that contains the information about the function and its starting-time point. The spread-spectrum function hence must be well protected for confidential information communication and it this feature of spread spectrum that helps maintaining the secrecy of information. If this function comes in the wrong hands, it can lead to the invasion of secrecy of the information [2]. 2.3 HOW SPREAD SPECTRUM WORKS Spread Spectrum uses wide band which is a noise-like signals and hence are hard to detect. These signals are also hard to lock on to or be tracked by any intruder. Spread signals are made in such a manner that their bandwidth is larger than the information they are transmitting to give them a noise like appearance, hence protecting the information it is carrying and maintain its secrecy and confidentiality [4]. Spread Spectrum signals use fast codes that have a high data rate. These codes are called Pseudo Random or Pseudo Noise codes. These are called Pseudo for the reason being that they are not real Gaussian noise [4]. Spread Spectrum transmitters possess similar transmits power levels to that of narrow band transmitters. Spread Spectrum signals are so wide hence they transmit at a much lower spectral power density which is measured in Watts per Hertz as compared to narrowband transmitters. This characteristic (lower spectral power density)gives spread signals a huge advantage in digital communication and it is this capability that is responsible for the rapid use of Spread Spectrum today [4]. The numerical advantage of wider bandwidth is obtained from the Claude Shannons equation describing channel capacity [4]. (2.1) Where; C=channel capacity of the signal, B=Bandwidth of the signal, S=signal power, and N=noise power. = (2.2) On Applying the MacLaurin series development for (2.3) is usually low for spread-spectrum applications. Assuming a noise level such that

Free Catcher in the Rye Essays: Keeping It Real :: Catcher Rye Essays

Keeping It Real in The Catcher in the Rye The Catcher in the Rye is a story about a kid named Holden Caulfield who experiences some interesting things and people. From having breakfast with a couple of nuns, to being with a prostitute, to getting kicked out of school, Holden handles each situation the best way he can. Some of the people Holden meets, he likes, but the type of people Holden cannot stand are the ‘phonies.’ Holden had met a lot of phonies in his lifetime. Holden lived in a dorm that was named after a phony, he heard a phony playing a piano, and he met his date’s phony friend. Holden went to a boarding school called Pencey Prep. There, Holden lived in the Ossenburger Memorial Wing. This hall was only for juniors and seniors. The dorms were named after a man named Ossenburger who also went to Pencey a long time ago. After Ossenburger got out of Pencey, he made a lot of money in the undertaking business and gave some of it to Pencey and that is why the new wing of the dorms are named after him. The morning after, Ossenburger gave a speech to the students of Pencey Prep regarding how he was never ashamed when he was in some kind of trouble. He stated that if so, he would get right down on his knees and pray to God. Ossenburger kept on rambling about how one should always pray to God and to talk to God wherever they were. Ossenburger said to think of him as your buddy. Holden was amused by his speech, and he could â€Å"just see the big phony bastard... asking Jesus to send him a few more stiffs.†   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Holder next went to a nightclub called Ernie’s for a few drinks. Even though it was so late, the club was packed. Ernie, the piano player, was playing some tune that Holden could not recognize. Ernie was putting in many high notes, showing off with ripples in the high notes, and doing a lot of other tricky things that Holden thought were dumb. However, the crowd was going crazy for Ernie, clapping and such. â€Å"Old Ernie turned around on his stool and gave this very phony, humble bow.† Though Holden thought Ernie’s snobbish attitude was so phony , he felt kind of sorry for Ernie.

AP language rhetorical terms list Essay

Look up the words and fill in the chart as best as you can. Some of the terms are review and some are new. We will use this list throughout the year so keep an updated copy with you in class. You may choose to make note cards for study but they are not required for a grade. Periodically, you will be quizzed on how well you know the terms by using in your writing and recognizing in text. Terms When do I use it? Define it Can I recognize it? Can I use it in my writing? ad hominen argument appealing to feelings or prejudices rather than intellect ad populum fallacious argument that concludes a proposition to be true because many or most people believe it. allegory literary device The representation of abstract ideas or principles by characters, figures, or events in narrative, dramatic, or pictorial form. alliteration style The repetition of the same sounds or of the same kinds of sounds at the beginning of words or in stressed syllables allusion rhetoric device reference ambiguity tone Doubtfulness or uncertainty as regards interpretation analogy Similarity of functions or properties; likeness antecedent grammar A preceding occurrence, cause, or event. antithesis opposite aphorism A tersely phrased statement of a truth or opinion; an adage apostrophe The direct address of an absent or imaginary person or of a personified abstraction, especially as a digression in the course of a speech or composition. attitude essay A state of mind or a feeling; disposition atmosphere A dominant intellectual or emotional environment or attitude begging the question type of informal fallacy in which an implicit premise would directly entail the conclusion; in other words, basing a conclusion on an assumption that is as much in need of proof or demonstration as the conclusion itself chiasmus A rhetorical inversion of the second of two parallel structures clause A group of words containing a subject and a predicate and forming part of a compound or complex sentence. colloquialism Characteristic of or appropriate to the spoken language or to writing that seeks the effect of speech; informal. conceit A favorable and especially unduly high opinion of one’s own abilities or worth. concrete detail Specific details that form the backbone or core of the body paragraphs. Synonyms for concrete details include facts, specifics, examples, descriptions, illustrations, support, proof, evidence, quotations, paraphrases, or plot references. connotation An idea or feeling that a word invokes person in addition to its literal or primary meaning denotation The action or process of indicating or referring to something by means of a word, symbol, etc descriptive detail devices A turn of phrase intended to produce a particular effect in speech or a literary work diction Word choice didactic ntended to teach, particularly in having moral instruction as an ulterior motive euphemism Mild expression in place of a severe one extended metaphor An extended metaphor, also called a conceit, is a metaphor that continues into the sentences that follow. It is often developed at great length, occurring frequently in or throughout a work, and are especially effective in poems and fiction. false analogy An informal fallacy applying to inductive arguments, in which the similarity in one respect of two concepts, objects, or events is taken as sufficient to establish that they are similar in another respect in which they actually are dissimilar figurative language Language that communicates ideas beyond the ordinary or literal meaning of the words. figure of speech A figure of speech is a use of a word that diverges from its normal meaning, or a phrase with a specialized meaning not based on the literal meaning of the words in it such as a metaphor, simile, or personification. genre A category of artistic composition, as in music or literature, characterized by similarities in form, style, or subject matter hasty- over/ generalization A general statement or concept obtained by inference from specific cases homily genre type of sermon, serious talk, speech or lecture hyperbole exaggeration imagery Visually descriptive or figurative language, esp. in a literary work inference/ infer A conclusion reached on the basis of evidence and reasoning invective diction Strong use of language used to attack irony/ironic The expression of one’s meaning by using language that normally signifies the opposite, typically for humorous or emphatic effect verbal Relating to or in the form of words situational A term denoting a tactic or combo that can only be used under certain circumstances and cannot be done in a neutral state where both characters are on the ground. dramatic Sudden or striking juxtaposition The fact of two things being seen or placed close together with contrasting effect language The method of human communication, either spoken or written, consisting of the use of words in a structured and conventional way loose sentence A loose sentence is a type of sentence in which the main idea is elaborated by the successive addition of modifying clauses or phrases. metaphor in literature and rhetoric, an analogy between two objects or ideas, conveyed by using a word instead of another word metonymy Metonymy is a figure of speech in which a thing or concept is called not by its own name but rather by the name of something associated with that thing or concept. mood the affective setting of a piece of literature narrative A narrative (or story) is any account of connected events, presented to a reader or listener in a sequence of written or spoken words, or in a sequence of (moving) pictures. narrative devices Methods to help convey the message in the story narrative technique The methods involved in telling a story; the procedures used by a writer of stories or accounts. Narrative technique is a general term (like â€Å"devices,† or â€Å"resources of language†) that asks you to discuss the procedures used in the telling of a story. onomatopoeia the use of imitative and naturally suggestive words for rhetorical, dramatic, or poeticeffect. oxymoron a figure of speech by which a locution produces an incongruous, seemingly self-contradictoryeffect, as in â€Å"cruel kindness† or â€Å"to make haste slowly. † paradox a statement or proposition that seems self-contradictory or absurd but in realityexpresses a possible truth. parallelism Parallel comparison parody Mocking imitation pedantic tone Overly scholarly, academic, or bookish periodic sentence A periodic sentence is a sentence that is not grammatically complete until the final clause or phrase. Personification the attribution of human nature or character to animals, inanimate objects, or abstractnotions, especially as a rhetorical figure. persuasive devices Techniques the author uses to influence the way you feel persuasive essay Persuasive writing, known as creative writing or an argument, is a piece of writing in which the writer uses words to convince the reader that the writer’s opinion is correct with regard to an issue. point of view(know all) narrative mode, the perspective of the narrative voice; the pronoun used in narration post hoc fallacy Post hoc ergo propter hoc, Latin for â€Å"after this, therefore because of this†, is a logical fallacy (of the questionable cause variety) that states â€Å"Since that event followed this one, that event must have been caused by this one. prose Prose is a form of language which applies ordinary grammatical structure and natural flow of speech rather than rhythmic structure (as in traditional poetry). red herring Red herring is an English-language idiom, a logical fallacy that misleads or detracts from the issue. It is also a literary device that leads readers or characters towards a false conclusion, often used in mystery or detective fiction. repetition Repetition is the simple repeating of a word, within a sentence or a poetical line, with no particular placement of the words, in order to provide emphasis. rhetoric Rhetoric is the art of discourse, an art that aims to improve the capability of writers or speakers that attempt to inform, persuade, or motivate particular audiences in specific situations. rhetorical appeal Ethos, pathos, logos logos Originally a word meaning â€Å"a ground†, â€Å"a plea†, â€Å"an opinion†, â€Å"an expectation†, â€Å"word,† â€Å"speech,† â€Å"account,† â€Å"reason, ethos Cultures guiding ideals pathos Appealing to the audience’s emotions rhetorical features his may involve the use of elaborate words or phrases that create a particular set of sounds. Perhaps puns, double meanings,alliteration, assonance or unusual grammatical forms may be used. rhetorical modes describe the variety, conventions, and purposes of the major kinds of writing. compare/ contrast Evaluate differences and similarities definition Expressing the nature of something cause/effect Cause is why something happens and effect is what happens division/ classification Organize into category example/illustration or type of composition intended to give information about (or an explanation of) an issue, subject, method, or idea. exposition type of composition intended to give information about (or an explanation of) an issue, subject, method, or idea. process analysis A method of paragraph or essay development by which a writer explains step by step how something is done or how to do something. argumentation/persuasive Social influence description a statement, picture in words, or account that describes; descriptive representation. rhetorical question A rhetorical question is a figure of speech in the form of a question that is asked in order to make a point. rhetorical situation The Rhetorical Situation is the context of a rhetorical event that consists of an issue, an audience, and a set of constraints. sarcasm harsh or bitter derision or irony. satire a literary composition, in verse or prose, in which human folly and vice are held up toscorn, derision, or ridicule. simile a figure of speech in which two unlike things are explicitly compared sentence structures Grammatical arrangement of words in sentences simple Easy to understand compound combinations of two or more elements complex In general usage, complexity tends to be used to characterize something with many parts in intricate arrangement. inverted word order style variation in language use to which social meanings are attributed stylistic devices In literature and writing, a stylistic device is the use of any of a variety of techniques to give an auxiliary meaning, idea, or feeling to the literal or written. syllogism a piece of deductive reasoning from the general to the particular symbol/ symbolism something used for or regarded as representing something else; a material object representingsomething, often something immaterial; emblem, token, or sign. synecdoche a figure of speech in which a part is used for the whole or the whole for a part, the special for thegeneral or the general for the special syntax the study of the rules for the formation of grammatical sentences in a language. theme the unifying subject or idea of a story thesis Central argument tone a literary technique which encompasses the attitudes toward the subject and toward the audience implied in a literary work that is compatible with the other drive transition general aspects of writing style that signal changes in a story understatement Understatement is a form of speech which contains an expression of less strength than what would be expected. litotes In rhetoric, litotes (or) is a figure of speech in which understatement is employed for rhetorical effect, principally via double negatives. meiosis reproduction wit Wit is a form of intelligent humour, the ability to say or write things that are clever and usually funny.

Good to Great Book Review - 1596 Words

Good to Great Book Review Throughout the book Collins examines what differentiates a good company from a great company. This first chapter addresses the process of evaluating information and finding characteristics that differentiates the two types of companies. After finding these characteristics Collins’s team compared the data to a variety of companies and discovered what a great company had that a good company didn’t. â€Å"We came to think of our research effort as akin to looking inside a black box. Each step along the way was like installing another light bulb to shed light on the inner workings of the good to great process.† All great companies have a Level 5 leader calling the shots. A level 5 leader is an individual who has a†¦show more content†¦The hedgehog principle is based around three essential questions. 1. What are you deeply passionate about? 2. At what can you be the best in the world? 3. What drives your economic engine? According to Collins, a great company should answer all three questions, take whatever answers all three of them, and build their hedgehog strategy around that answer. However, it should be noted here, that the hedgehog concept is not universally accepted as the best strategy to take. Philip Tetlock contends that the fox, the thinker who knows many little things, drawing from an eclectic array of traditions, is better able to improvise in response to changing events, and is more successful in predicting the future than the hedgehog, which knows one big thing, toils devotedly within one tradition, and imposes formulaic solutions on ill-defined problems. The fox as well as the hedgehog idea seem to be extremities on the acceptable strategy spectrum. The best manager should try to find a middle ground, for example concentrating on one big thing during the early stages and then many little projects once the flywheel has taken off. 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