Radio telephones have been used for decades, but have not been widely available due to limited system capacity. The breakthrough that addressed this capacity problem was the development of the cellular concept, which allows frequency reuse. Needless to say, the use of wireless communications has increased exponentially since that breakthrough. The discovery of electromagnetic waves by the German physicist Heinrich Hertz in 1887 is generally considered to be the take-off date for wireless communication. This is understandable, because all kinds of wireless communication nowadays work with Hertzian waves, wireless telephony, radio, live television, or wireless computing in its various technical appearances, e.g. Bluetooth or the wireless local area networks (WLAN or "WiFi"). .
The textbook version of the history of "the wireless" usually continues with the Italian engineer and businessman Guglielmo Marconi, who introduced wireless telegraphy in large scale in the British Empire and who was the first to transmit wireless signals across the Atlantic Ocean. Wireless telephony was developed and, shortly before and during World War I, the success story of radio broadcasting began. The idea of wireless television also was in the air from the very beginning of TV-history, but technical difficulties were enormous and so it was not before 1960 when "Echo", the first communication satellite was launched by the NASA. Wireless computing, finally, took off somewhat late at the end of the 20th century and is right now in its crucial phase of development.
Retrospectively, all this sounds pretty straight forward. At the times, it was not always very straight forward, though. The target of this work is to take a closer look at some of the crucial moments or years during the history of wireless communication and to try and find out, why and when certain technological decisions were made that gave the whole wireless enterprise new directions.
1. What is the difference between Mesh, Bus, Ring and Star topologies? Bus topology advantages are the cable is inexpensive, simple to understand and easily to extend. Bus disadvantages are difficult to troubleshoot, increase network traffic decrease network performance and limited physical length. ...
What is History? So, what is History? When I told someone I was giving a talk on History and what it is, they said, "and you only have an hour?" No doubt everyone in this room has some idea of what History is, or isn't. So let's get started and see how far we can get with my highly selective ...
What is World History? World history is the study of the ways in which the world changes over time. ... This examination of interactions between these distant regions is what is meant by the term World History. ... One reason is that the United States has supported numerous nations throughout history in times of trouble. ... By studying World History one can find the origins of the Muslim religion with Muhammad. ...
Introduction: A global wireless protocol specification to work across heterogeneous wireless network technologies and is a communications standard for digital mobile phones, supported by over 1,200 companies is defined by Wireless application Protocol (WAP). WAP makes it possible for mobile phones...
Abstract This essay contains a few reasons of how history as a discipline is beneficial to society and the purpose history overall. Also how a journal I so important especially for a subject like history. As well as using History of California journal as an example on how a history journal works and the contents. ... There is a sense of Identity that comes with learning history. ... The saying "knowledge is power " really comes into play with history. ...
Sacred history can be defined as a history that is spread by the word of mouth, by oral teachings as opposed to written works. ... Sacred history can be defined as a history that is spread and kept by the word of mouth, by oral teachings. ... This would make the text then sacred history as well. ... Sacred history is different from scientific history for two main reasons. ... The second reason why sacred history differs from Thucydides theories of scientific history and ˜historical recurrence' is that Thucydides didn't believe in a divine intervention while sacred history usua...
The Oral Tradition:Sundiata: An Epic of Old Mali How Can A Historian Use Oral Tradition When Writing History Oral tradition is a history or a story passed down from generation to generation through word of mouth. The story is usually the history of a civilization or culture. ... Male griots tell the family history of the male side and females tell the female side. ... Writing traditions do consist in ancient history in Africa, but most Africans prefer the traditions of African storytelling and oral history. ... "Listen to my word, you who want to know; by my mouth you will learn the his...
One of the first recorded Bigfoot sightings was made by Leif Erikson when he discovered the New World nearly 500 years before Columbus. Erikson and his crew were the first Europeans to settle in North America and witness the creature that is now called Bigfoot. It was said that he saw more than one ...
"American History X" is undeniably one of the most poignant and potent movies I have ever seen. ... In "American History X" however, hate destroys the bond between two brothers. ... "American History X" gives us more closure. ... "American History X" has much stronger actors. ... In "American History X" however, we go beyond pity. ...
