Wireless communication plays a significant role in day to day life. Besides communication, wireless technology has become an integral part of our daily activities. The transmission of data or information from one place to another wirelessly is referred as wireless communication.
This provides an exchange of data without any conductor through RF and radio signals. The information is transmitted across the devices over some meters to hundreds of kilometres through well-defined channels. Different types of signals are used in communication between the devices for wireless transmission of data.
The following are the different electromagnetic signals are used depending on their wavelength and frequency. Radio frequency is a form of electromagnetic transmission used in wireless communication. RF signals are easily generated, ranging 3kHz to GHz. These are used in wireless communication because of their property to penetrate through objects and travel long distances.
Radio communication depends on the wavelength, transmitter power, receiver quality, type, size and height of the antenna. Infrared radiations are electromagnetic radiations with longer wavelengths than visible light.
These are usually used for short-range communications. These signals do not pass through solid objects. Microwaves are the form of electromagnetic transmission used in wireless communication systems.
The wavelength of microwave ranges from one meter to one millimetre. The frequency varies from MHz to GHz. These are widely used for long distance communications and are relatively less expensive.
Light is an electromagnetic radiation with a wavelength ranging between infrared radiations and ultraviolet radiations. The wavelength ranges from to THz. These are unguided optical signals such as laser and are unidirectional. Wireless communication technology is categorized into different types depending on the distance of communication, the range of data and type of devices used. The following are the different types of wireless communication technologies.
Radio communication was one of the first wireless technology developed and it is still in use. The portable multi-channel radios allow the user to communicate over short distances whereas citizen band and maritime radios provide communication services over long distances for truckers and sailors.
Mostly radio broadcasts sound through the air as radio waves. Radio has a transmitter which transmits the data in the form of radio signals to the receiver antenna. To broadcast common programming stations are associated with the radio networks.
The broadcast happens either in simulcast or syndication or both the forms. A cellular networkElect uses encrypted radio links, modulated to allow many users to communicate across the single frequency band.
As the individual handsets lack significant broadcasting power, the system depends on a network of cellular towers which are capable of triangulating the source of any signal and handing reception duties off to the most suitable antenna. The data transmission over cellular networks is possible with modern 4G systems capable of speeds reaching that of wired DSL. Cellular companies charge their customers by a minute of their voice and by the kilobytes for data. Satellite communication is a wireless technology having significant importance across the globe.
They have found widespread use in specialized situations. The devices using satellite technology to communicate directly with the orbiting satellite through radio signals.
This allows users to stay connected virtually from anywhere on the earth. Portable satellite phones and modems have powerful broadcast feature and reception hardware than the cellular devices due to the increased range. The satellite communication consists of a space segment and a ground segment.Wireless communications is a type of data communication that is performed and delivered wirelessly.
This is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices.
Wireless communication generally works through electromagnetic signals that are broadcast by an enabled device within the air, physical environment or atmosphere. The sending device can be a sender or an intermediate device with the ability to propagate wireless signals. The communication between two devices occurs when the destination or receiving intermediate device captures these signals, creating a wireless communication bridge between the sender and receiver device.
Wireless communication has various forms, technology and delivery methods including:. Toggle navigation Menu. Wireless Communications Last Updated: December 5, Definition - What does Wireless Communications mean? Techopedia explains Wireless Communications Wireless communication generally works through electromagnetic signals that are broadcast by an enabled device within the air, physical environment or atmosphere.
Wireless communication has various forms, technology and delivery methods including: Satellite communication Mobile communication Wireless network communication Infrared communication Bluetooth communication Although all of these communication technologies have different underlying architecture, they all lack a physical or wired connection between their respective devices to initiate and execute communication.
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Wireless Communication is a method of transmitting information from one point to other, without using any connection like wires, cables or any physical medium. Generally, in a communication system, information is transmitted from transmitter to receiver that are placed over a limited distance. With the help of Wireless Communication, the transmitter and receiver can be placed anywhere between few meters like a T.
Remote Control to few thousand kilometres Satellite Communication. We live in a World of communication and Wireless Communication, in particular is a key part of our lives. Communication Systems can be Wired or Wireless and the medium used for communication can be Guided or Unguided. Such type of medium is called Guided Medium. Since, space only allows for signal transmission without any guidance, the medium used in Wireless Communication is called Unguided Medium. If there is no physical medium, then how does wireless communication transmit signals?
Even though there are no cables used in wireless communication, the transmission and reception of signals is accomplished with Antennas.
Antennas are electrical devices that transform the electrical signals to radio signals in the form of Electromagnetic EM Waves and vice versa. These Electromagnetic Waves propagates through space.
Hence, both transmitter and receiver consists of an antenna. Electromagnetic Waves carry the electromagnetic energy of electromagnetic field through space. Electromagnetic Waves usually Radio Waves are used in wireless communication to carry the signals.
An Electromagnetic Wave consists of both electric and magnetic fields in the form of time varying sinusoidal waves. Both these fields are oscillating perpendicular to each other and the direction of propagation of the Electromagnetic Wave is again perpendicular to both these fields.
Pictorial representation of an Electromagnetic Wave is shown below where the Electric Field is acting in the Y — axis, magnetic field is acting in the Z — axis and the Electromagnetic Wave propagates in X — axis. Since the use of smoke signals, flags and flashing mirrors in the pre — historic period, Wireless communication has been a part of human life and is continuously evolving.
Modern Wireless Communication i. In the yearGuglielmo Marconi successfully demonstrated the Wireless Telegraphy by sending EM Waves for a short distance of meters. This demonstration paved way for Radio Communication and the term Radio is derived from Radiant Energy.
Since then, the technology related to wireless communication and wireless system has advanced rapidly and thus enabling transmissions over longer distances at low cost with cheaper devices. Throughout the development of wireless communication, there are many wireless systems and methods that flourished and many got disappeared. The best example for this is Telephone Communication and Television Transmission. Initially, all telephone related communication was carried out and still is using wired network.
But the rapid growth of Mobile Communication started to replace the complex wired telephone system. In this scenario, the wired technology became outdated and got replaced by wireless communication.Radio owes its development to two other inventions: the telegraph and the telephone. All three technologies are closely related, and radio technology actually began as "wireless telegraphy.
The term "radio" can refer to either the electronic appliance that we listen with or to the content that plays from it. In any case, it all started with the discovery of radio waves—electromagnetic waves that have the capacity to transmit music, speech, pictures, and other data invisibly through the air.
Many devices work by using electromagnetic waves, including radios, microwaves, cordless phones, remote controlled toys, televisions, and more. InMahlon Loomis, an American dentist, successfully demonstrated "wireless telegraphy. But it was Guglielmo Marconi, an Italian inventor, who proved the feasibility of radio communication.
He sent and received his first radio signal in Italy in Inhe flashed the first wireless signal across the English Channel, and two years later received the letter "S," which was telegraphed from England to Newfoundland now part of Canada. This was the first successful transatlantic radiotelegraph message.
Nikola Tesla is now credited with being the first person to patent radio technology. The Supreme Court overturned Marconi's patent in in favor of Tesla's.
Radiotelegraphy is the sending by radio waves of the same dot-dash message Morse code used by telegraphs. Transmitters, at the turn of the century, were known as spark-gap machines. They were developed mainly for ship-to-shore and ship-to-ship communication. This form of radiotelegraphy allowed for simple communication between two points. However, it was not public radio broadcasting as we know it today. The use of wireless signaling increased after it was proved to be effective in communication for rescue work at sea.
Soon a number of ocean liners even installed wireless equipment. Two years later, the Navy adopted a wireless system.
Introduction to Wireless Communication.Radio Communication.ppt
Inradiotelegraph service was established between five Hawaiian Islands. Inthe naval battle of Port Arthur in the Russo-Japanese war was reported by wireless.
And inthe U. Weather Bureau experimented with radiotelegraphy to speed up notice of weather conditions. Robert E. A year later, Marconi established regular American-European radiotelegraph service, which several months later enabled an escaped British murderer to be apprehended on the high seas. Meanwhile, overseas radiotelegraph service developed slowly, primarily because the initial radiotelegraph transmitter was unstable and caused a high amount of interference.
The Alexanderson high-frequency alternator and the De Forest tube eventually resolved many of these early technical problems. Lee de Forest was the inventor of space telegraphy, the triode amplifier, and the Audion, an amplifying vacuum tube.
In the early s, the development of radio was hampered by the lack of an efficient detector of electromagnetic radiation. It was De Forest who provided that detector.
His invention made it possible to amplify the radio frequency signal picked up by antennae. This allowed for the use of much weaker signals than had previously been possible. De Forest was also the first person to use the word "radio.Communication by encoding alphanumeric characters in analog signal Sent telegraphic signals across the Atlantic Ocean. Transmitting voice and data using electromagnetic waves in open space atmosphere Electromagnetic waves.
Higher frequency means higher energy photons The higher the energy photon the more penetrating is the radiation. TV box and a remote control infrared waves are used for long range distances between sender and receiver e.
Wireless Communication PDF | Notes, Syllabus, Book | B Tech 2020
TV broadcasting and cellular service both microwaves and radio waves are used. The information from sender to receiver is carrier over a well defined frequency band. This is called a channel Each channel has a fixed frequency bandwidth in KHz and Capacity bit-rate Different frequency bands channels can be used to transmit information in parallel and independently.
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Wireless Communication study material includes wireless communication notes, wireless communication book, courses, case study, syllabus, question paper, MCQ, questions and answers and available in wireless communication pdf form.
Wireless Communication subject is included in B. Wireless Communication Notes can be downloaded in wireless communication pdf from the below article. A detailed wireless communication syllabus as prescribed by various Universities and colleges in India are as under.
You can download the syllabus in wireless communication pdf form. Communication Systems can be Wired or Wireless and the medium used for communication can be Guided or Unguided.
Some of the wireless communication questions and answers are mentioned below.
The History of Radio Technology
You can download the QnA in wireless communication pdf form. It will help you to understand question paper pattern and type of wireless communication question and answer asked in bba, bcom, mba wireless communication exam. Below is the list of wireless communication book recommended by the top university in India.
In the above article, a student can download wireless communication notes for b.
Wireless Communication study material includes wireless communication noteswireless communication bookswireless communication syllabuswireless communication question paperwireless communication case study, wireless communication questions and answerswireless communication courses in wireless communication pdf form.
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