How does the mobile phone receive the signal Where is the mobile phone signal receiver

Mobile phones receive signals through electromagnetic waves.

In 1831, Faraday of England discovered the phenomenon of electromagnetic induction, and Maxwell further used mathematical formulas to elaborate the research results of Faraday and others, and extended the theory of electromagnetic induction to space.

More than 60 years later, Hertz experimentally confirmed the existence of electromagnetic waves. The discovery of electromagnetic waves became a turning point from wired communication to radio communication, and also became the birthpoint of the entire mobile communication.

The mobile phone communicates with the base station set up by the operator in the local area, and the mobile phone has a transceiver inside, which is connected to the antenna of the mobile phone, which is generally a piece of metal, which is generally attached to the inner shell of the mobile phone.

Communication is transmitted through radio waves of a certain frequency, generally using channels to distinguish different frequencies, for example, if you want to hit **, your mobile phone will first send a certain frequency of radio waves to tell the base station that you want to play **, and then the base station will look for a channel that is not occupied and assigned to you, of course, this is also to tell your mobile phone through radio waves, and then the two sides can start to communicate on the allocated channel.

The sound signal is converted into a current signal, which is then converted from the current to an acoustic signal.

When you make a call with mobile**, mobile** emits radio waves (also known as radio frequency energy). These radio waves can be received by the nearest base station, and once the base station receives the radio waves from the mobile**, it transmits them to the switching station, which transfers the call to another base station or fixed**line network according to the type of current call, so as to realize the call.

Since the advent of smart phones, mobile phones have been constantly updated to the present, and there are more and more functions of mobile phones, but its most important function is still **communication, when we pick up the mobile phone to call**, I don't know if you have ever had such a doubt, how is the information between mobile phones transmitted.

Mobile phones use electromagnetic waves to receive signals.

The tower is transmitted to the phone.

Through the electromagnetic waves transmitted to the signal tower, which is preaching and beating the ** people.

Superman who poops! It's about eleven o'clock, (it's too big.)

There are signal towers on the streets, and when you walk from one street to another, the towers in the street you just arrived at will become towers on another street to receive signals to your mobile phone, and there are usually places on the mobile phone to receive signals.

Satellite communication coverage is wide, ten satellites can achieve global coverage early, and to achieve global 4G signal coverage, more than 6 million base stations are used, and there are still many signal dead ends, such as some remote mountainous areas, there is no 4G signal at sea. The power of the mobile phone is not enough to use satellite communication, and soon the phone will run out of battery, and the cost is very high. The higher the cost, the higher the selling price, which is not enough to generate good business profits.

That's the real reason. Technology has never been an obstacle to business activity.

The satellite uses low-frequency electromagnetic waves below 500MHz as the working frequency band, with low frequency, long wavelength, long transmission distance and wide coverage. A satellite is like a space relay station, and the upper and lower links must complete the communication task through inter-satellite negotiation and the assistance of ground equipment. Coverage, capacity, cost, terminal and other aspects are important reasons why mobile phones cannot popularize satellite communications, and why in the field of communications, satellite communications cannot become the winner of public mobile communication networks.

The base station uses the ground, laid optical cable, and then transmitted through the optical cable, and then transmitted to the mobile phone through the action of light waves, and the connection between these base stations and mobile phones, so that the mobile phone's power use is greatly reduced, and the satellite's requirements for power are very high, and the general satellite ** is a very large battery, in order to support, based on various reasons.

The satellite is far away from the ground, and it takes a lot more time from the mobile phone to send the signal to the satellite, and then the satellite receives the signal and sends it back to the mobile phone, so the delay of the communication satellite is longer, the theoretical delay of 4G is 10 milliseconds, the theoretical delay of 5G is 1 millisecond, and the delay of the communication satellite is at least 20 milliseconds. The Tiantong-1 01 satellite was successfully launched at the Xichang Satellite Launch Center in August 2016. The launch of Tiantong-1 01 has filled the gap that China does not have an independent satellite mobile communication system.

Generally, it is through electromagnetic waves, and many base stations in the society have established confessional halls, and the signals of these base stations are also relatively comprehensive, and there will be corresponding air interfaces to receive signals.

We usually receive signals through the chip inside the mobile phone, connect with the base station, and connect to the network.

Our mobile phones have a signal receiver on it, which allows us to send and receive signals for communication.

Mobile phones were designed to have a device to receive signals, and most of them are now received through infrared.

Take the iPhone as an example:

In the frame of the fuselage, the signal receiver is shown below;

Mobile phone signal amplifier (professional name: repeater) consists of antenna, RF duplexer, low noise amplifier, mixer, ESC attenuator, filter, power amplifier and other components or modules composed of upstream and downstream amplification links. The basic principle of its operation is:

The forward antenna (donor antenna) is used to receive the downlink signal of the base station into the repeater, and the useful signal is amplified through the low-noise amplifier, the noise signal in the signal is suppressed, and the signal-to-noise ratio (SN) is improved. Then it is downconverted to the intermediate frequency signal, filtered by the filter, the intermediate frequency is amplified, and then the frequency is shifted to the radio frequency, and then the frequency is amplified by the power amplifier, and the backward antenna (retransmission antenna) is transmitted to the mobile station; At the same time, the backward antenna is used to receive the uplink signal of the mobile station, which is processed by the uplink amplification link along the opposite path: that is, it is transmitted to the base station through the low-noise amplifier, downconverter, filter, mid-amplifier, upconverter and power amplifier. So as to achieve two-way communication between the base station and the mobile station.

Generally in the upper left corner of the phone! Like the iphone is in the upper left corner MT is also nokia is all Thank you for adopting.

There is no mobile phone signal in the countryside, so sell a mobile phone number station.

Signals are received through electromagnetic bai waves.

DU1831, England Zhi

Faraday discovered the phenomenon of electromagnetic induction, and Maxwell's version further expounded the research results of Faraday et al. with the formula of number weight, and extended the theory of electromagnetic induction to space.

More than 60 years later, Hertz experimentally confirmed the existence of electromagnetic waves. The discovery of electromagnetic waves became a turning point in the transition from wired electricity to radio communication, and also became the birthpoint of the entire mobile communication.

The signal of the mobile phone is sent by the mobile phone signal station, and when two people talk, the mobile phone signal is transmitted back to the mobile phone signal station and then through the relay station. In order to ensure the quality of the call and prevent the number channeling, the mobile phone signal will be attached to the mobile phone signal station and the station of the mobile phone relay station**. The technology of the telecommunications company can find out the location of the caller based on these **.

One of the services in Beijing's Dynamic Zone is a "Dynamic Location" service, which uses this technology to return the current location of the mobile phone holder. Therefore, when the other party's mobile phone ** card is a mobile company's "Dynamic Zone" card, you can use this service to check the other party's current location. There is a "You are in **" in the dynamic location of the Dynamic Zone service.

However, if you don't have this service, you won't be able to look it up. Telecom companies don't have that big database to keep track of the "transmission paths" of all calls, which you can imagine with your toes, and there is no need for this, so you can only do this by preparing in advance and monitoring the process of the call. However, according to China's communications laws, you cannot casually monitor other people's phone calls, and only the public security procuratorate and the courts have this right.

The interface of the mobile phone is modulated into a high-frequency signal through signal processing and transmitted to the satellite, and the satellite is then transmitted to the target number, and the target mobile phone realizes signal transmission by demodulating the high-frequency signal into the corresponding interface signal and voice and other information.