OFDM (Orthogonal frequency-division multiplexing) is a method of coding digital signals by orthogonal frequency division as multiple subcarriers. This technique allows to fight against frequency-selective channels allowing equalization of low complexity. These channels are particularly apparent in the presence of multipath and are particularly disadvantageous when the transmission rate is high. This technique is widely adopted in most applications with very high speed.
There exist several variants of OFDM. DMT (Discrete Multi Tone) refers to a system for transmitting OFDM baseband. The COFDM (Coded Orthogonal Frequency Division Multiplexing) introduces error correcting code. WCP-OFDM (Cyclic Prefix Weighted Orthogonal Frequency-Division Multiplexing) includes the addition of a cyclic prefix and the weighting of the output signal of the transmitter to adapt the mobile multipath channels. Continue reading
Example research paper about Lucid Dreaming:
Lucid dream is a dream in which a person realizes that he or she sleeps. In such a dream, people can control their actions, affect the world around them, and define further development of the dream plot.
Most lucid dreams occur during REM sleep. Acquisition of consciousness can be spontaneous or as a result of special techniques. Lucid Dreams can vary the intensity of feelings, the degree of control the length of duration, and many other parameters.
Do not confuse this term with hypnotic condition.
The first mention of the lucid dream phenomenon belongs to Aristotle: “Sometimes when a person is asleep, something in his mind allows him understand that everything that happens is just a dream.” Continue reading
The American dream is a term used in a lot of ways. However, it revolves around the thought that anyone living in the US can achieve something coupled with the possibility of lead a happy and successful life. The dream has been an aim for the majority of the individuals who reside in the land of America that gives them hope of the future. The definition of the term has expanded to incorporate freedom, achievement and meaningful relationships.
People who manage to achieve their respective are deemed to have achieved the American dream. Part of the dream involves controlling one’s own fate, becoming successful, and having good living conditions. Example of this dream has included being in possession of things like television, automobiles, supermarkets and having access to the Internet.
In this perspective, the American dream revolves around making better living conditions for individuals and their children. It’s about having the chance to achieve what elsewhere may have not been possible. The outline of the dream is different for each person. For those who come from unstable countries, where death is always there because of various factors like the drug lords who have taken power of their countries and cause insecurity, the American dream is attaining peace. For a successful middle class individual, happiness would never be possible until he owned a yacht h to travel to Europe on an annual basis. Continue reading
Free Research Paper on Tourism:
Tourism is the act of traveling for pleasure to a place other than where a person usually lives, which may involve a night at a hotel and possibly booking the transport.
Initially related to leisure and health, now tourism also includes all economic activities, which the person uses during his voyage (transport, hotels, restaurants, bars, etc.)
It may be, for example, a business trip (it is called “business tourism”) or a religious pilgrimage (“cultural tourism”) or to travel in order to have sex with locals (“sex tourism”).
Medical treatment can also be the reason for the travel to another country; in this case, it is considered a medical tourism. Continue reading
Globalization is the process of the global political, cultural and economical integration. Today processes of globalization are very active, because the whole world is involved into the international trade and a country can not exist separately from the rest of the world, because the economics and politics of the world spread upon every country. The process of globalization has already begun in the 12th century, when the countries of Europe started trading and build political relations between one another. With the run of time more and more countries became involved in the process and now the whole world is the one global community. There are international corporations which open their branches all over the world conquering new and new markets, international banks which serve in every country crediting people all over the world and in such a way connect them. Continue reading
American History X is an American drama filmed in 1998 and telling a story about American neo-Nazism in the 1990s. The movie is a debut for Tony Kaye, as a filmmaker and David McKenna, as a writer. Among other advantages of the movie, critics noted the talented acting of the lead actor Edward Norton, who was nominated for several awards, including the Oscar. Among the disadvantages of “American History X,” critics noted the scenes of excessive violence. However, most critics felt that these scenes give more credence to what is happening on the screen. The American History X is ranked 311th in the list of “500 greatest movies of all time” by Empire magazine and the 35th in the list of top 250 movies according to IMDb.
The film has the same title as the school essay, which black director Bob Sweeney gives his student Danny Vinyard, a member of the National Assembly of skinhead, to write, wishing to change the attitude of the latter. The phrase «American History» comes from the name of a school subject “American History” (similar to “recent history”), and can be interpreted as “the history of America” (similar to the “history of the state”). Continue reading
Example Bacteria Research Paper:
Bacteria are one of the major groups of microorganisms. By the late 1970s, the word “bacteria” was synonymous with prokaryotes, but in 1977, on the basis of molecular phylogenetics, prokaryotes were divided into kingdoms of Archeobacteria and Eubacteria.
Then, to emphasize the differences between them, they were renamed into the domains of Archaea and Bacteria, respectively. Science that studies bacteria is bacteriology, microbiology department. Continue reading
Amelia Earhart Research Paper:
Amelia Mary Earhart was born on 24 July 1897 in Atchison, Kansas, the daughter of a lawyer Edwin Earhart. Edwin’s wife, Amy, was the daughter of a local judge. Amelia was the oldest child in the family. The second daughter, Muriel, was born two and a half years later.
From an early age, Earhart sisters enjoyed extraordinary, for that time, freedom of choice of interests, friends, and entertainment. From her young years, Amelia was a great rider, swimmer, tennis player, and shooter – she did her targetpractice with a .22 caliber rifle – her father’s present. She learned to read, when she was four years old and since then read many various books, but was especially attracted by the books of the great discoveries and adventures. As a result, despite their belonging to the “weaker sex,” Amelia has become a recognized leader and instigator among children from the neighborhood. Continue reading
RMS Titanic was a British steamship built by the White Star Line company. It was the second of the three twin liners, such as Olympic, then the largest passenger ocean liner in the world. During her first voyage at night April 14, 1912, Titanic collided with an iceberg and sank within 2 hours and 40 minutes. There were 1,316 passengers and 908 crew members on board. Only 711 of them were rescued. This disaster has become one of the biggest disasters of the last century occurred in peacetime.
Titanic was laid March 31, 1909 at the shipyards of the Harland and Wolff shipbuilding company in Queens Island (Belfast, Northern Ireland). It was an expensive shipyard, but performed almost all of the work independently and was famous for its excellent quality. Continue reading