wi fi telephones This is a topic that many people are looking for. star-trek-voyager.net is a channel providing useful information about learning, life, digital marketing and online courses …. it will help you have an overview and solid multi-faceted knowledge . Today, star-trek-voyager.net would like to introduce to you How WiFi and Cell Phones Work Wireless Communication Explained. Following along are instructions in the video below:
“Many of us really understand what goes non when you text your friend across the the ocean and they get the ping almost instantaneously allow me to entertain you with little thought nexperiment when you press send on your favourite nmessaging app. Where s your message really going into the air you d say like radio nwaves. But let s back up a bit when you press send on whatsapp you re nessentially sending instructions to your mobile processor via tiny copper wires on a printed ncircuit board in your smartphone. Now these instructions are essentially electrical nimpulses right and electrical impulses are just electrons nflowing along the potential difference how exactly does your message jump into nthin air from being electron flows in copper wires.
At one stage you had a circuit board that nyou could touch and feel and even smell. And then suddenly you have radio waves in nthe invisible. Part of the spectrum flying away into thin air at light speed. What s in between what s in between is this odd looking device nit s an antenna which translates to a pole in latin.
An antenna is a metal tongued voodoo device nthat swallows electrical impulses and spits out radio waves. It is silent as the dead but its screams ncan be heard for miles specifically a wi fi antenna like in the npicture. Screams at 24 ghz 2 billion beats. Per second and spits out waves of length.
N125 centimeters unlike visible light these waves can pass nthrough walls and even bend around the corners..
How does an antenna produce radio waves. Before we answer this question let s take na small detour do you remember the recent buzz in pop science nabout gravitational waves they re basically fluctuations in gravitational nfield propagating as radiant energy einstein s general relativity. Predicted ntheir existence a hundred years ago. And we ve only recently discovered them just like gravitational waves.
Electromagnetic nwaves are fluctuations in electromagnetic field propagating as radiant energy and not much unlike the story of gravitational nwaves. The existence of invisible electromagnetic waves was predicted by maxwell s equations nwell before their discovery by heinrich hertz. So to produce radio waves. You need to create nfluctuations in electromagnetic field and to create those fluctuations you need nelectrons moving around in a conductor.
The act of radio wave synthesis is a carefully nchoreographed rhythmic dance of electrons in tiny copper wires like perturbations in still water that radiate noutward from the point of disturbance the electron flows in an antenna cause perturbations nin electromagnetic field which radiate out into space like electromagnetic waves when you press send on your favourite nmessaging app. Your mobile os sets off a chain of events that ultimately encode the message nas a careful choreography of electron dance this dance. Results in rhythmic ebbs and flows nin the electromagnetic field in the surrounding space which radiate outward towards a cell ntower the receiving antenna on the cell tower feels nthese ebbs and flows on its conducting surface inducing. An electron dance.
Very similar to nthe one at the transmitter..
This electron dance is again a set of electric nimpulses in tiny copper wires. Which are decoded by the hardware at the cell tower the decoded information is then carried on nhigh throughput cables for thousands of miles across countries continents and even oceans. Nthrough transatlantic communications. Cables or some other submarine communications cables nto.
A cell tower near your friend across the ocean from the tower to your friend s phone is nanother wireless jump and finally your friend hears the familiar nping how does the phone know where the cell tower nis. It doesn t and it doesn t need to your phone broadcasts your message in all ndirections for anyone to listen to. But don t worry your message will be encrypted nand. Only the cell tower can decode your message.
How does the cell tower. Know that the message nis from me. With every message you transmit you also ninclude a code that uniquely identifies your device that is how the cell tower knows. It s you how does the cell tower differentiate between nmessages from different phones.
All agree on a protocol to send nmessages to the tower either at different times different frequencies different locations nor using different codes the best analogy. I have for this is that of na classroom imagine a classroom with a 100 students and njust one teacher now if all the students start speaking at nonce. The teacher cannot understand any of them so they agree on a protocol. If a student wants to speak they raise their nhand and wait for the teacher to point to them the student does not speak unless they are nasked by the teacher to speak if multiple students raise their hands at nonce the teacher picks them out one by one so that only one student is speaking at any npoint in time the cell tower is the teacher and the devices nare students.
While students can speak at different times. Nto avoid interference devices can speak at different times. Different frequencies or ndifferent codes to avoid interference. So you re telling me that the majority nof.
The communication is not really wireless yes. Unless you re using a satellite phone. Wireless. Ncommunication.
Is only used for two steps along the road sender to tower 1 and tower 2 to nreceiver the communication between the cell towers nhappens through ultra high speed communication cables underground..
But aren t cables so out of fashion for n21st century. Why not use wireless all the way well the cables. We re talking about here nlike the transatlantic communications cable are definitely very high tech. They can carry terabytes of data every second nand do not face the problem of interference.
Nearly as much as their wireless counterparts. Also you ll need a lot of satellites to ncater to billions of users and their data needs if you want to go wireless. All the way and launching satellites is really really nexpensive that s it for today guys. We ll meet you with an another interesting nvideo till.
Then stay happy stay curious. ” ..
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