The difference between Bluetooth and wifi as two wireless transmission mediums The specific question

Wrong... You're wrong.

Laptops can also be connected peer-to-peer via wifi.

My roommate and I are directly connected with wifi without wireless routing, and the difference between the two is mainly in the wireless frequency bands used, transmission distance and speed.

The power consumption of Bluetooth is very small, so it is suitable for small file transfer at close range on mobile phones, wifi speed is high, long distance is suitable for network application connection.

I only know that the Bluetooth transmission is slow, the wifi is wireless, and the transmission is faster than Bluetooth.

If there is Bluetooth between mobile phones, mobile phones and computers can also be interconnected, but Bluetooth adapters and Bluetooth driver software are required....The two transmission methods are not the same, wifi is not common in China, only developed cities have signals, but Bluetooth transmission seems to be now copycat machines are very mature technology....

Bluetooth is a wireless transmission medium.

In the computer network, wireless transmission can break through the limitations of the wired network, use space electromagnetic waves to achieve communication between sites, and can provide mobile communication for the majority of users. The most commonly used wireless transmission media are: radio waves, microwaves, and infrared.

Methods of wireless communication include radio waves, microwaves, Bluetooth, and infrared.

Radio wave. Radio waves refer to electric lead-induced magnetic waves in the radio frequency band that propagate in free space, including air and vacuum. Radio technology is the technology that transmits sound or other signals through the stimulation of radio waves.

The principle of radio technology is that a change in the intensity of the current in a conductor produces radio waves. Using this phenomenon, information can be loaded on top of radio waves by modulation. When the radio wave travels through space to the receiver, the change in the electromagnetic field caused by the radio wave will generate an electric current in the conductor.

The purpose of information transmission is achieved by extracting the information from the current change through demodulation.

Microwave. Microwave refers to electromagnetic waves with a frequency of 300MHz-300GHz, which is the abbreviation of a limited frequency band in radio waves, that is, electromagnetic waves with a wavelength between 1 meter (excluding 1 meter) and 1 millimeter, which is a general term for decimeter waves, centimeter waves, and millimeter waves. The frequency of microwaves is higher than that of ordinary radio waves, and it is also commonly referred to as "ultra-high frequency electromagnetic waves".

Infrared. Infrared is one of the many invisible rays of the sun's rays, discovered by the German scientist Hoxel in 1800, also known as infrared thermal radiation, he used a prism to break down the sunlight, placed a thermometer on the position of the color band of various colors, trying to measure the heating effect of various colors of light. It turned out that the thermometer on the outside of the red light warmed up the fastest.

Therefore, it is concluded that in the solar spectrum, there must be invisible light on the outside of the red light, which is infrared light. It can also be used as a medium for transmission.

The wavelength of infrared rays on the solar spectrum is greater than that of visible light, and the wavelength is. Infrared can be divided into three parts, namely near-infrared, with wavelengths between; mid-infrared, wavelengths between; Far infrared, wavelength between.

Infrared communication has two most prominent advantages:

1. It is not easy to be found and intercepted, and the confidentiality is strong;

2. It is almost free from electrical, celestial and man-made interference, and has strong anti-interference. In addition, the infrared communication machine is small in size, light in weight, simple in structure, and inexpensive. However, it must communicate within direct visual distance, and its propagation is affected by the weather.

In the case that you can't set up a wired line, and you are afraid of exposing yourself to the radio, it is better to use infrared communication.

WLAN is a wireless LAN based on wireless APs.

Wi-Fi refers to connecting to the Internet through radio waves; The common one is a wireless router, then the effective range of the radio wave coverage of this wireless router can be connected to the Internet by wifi connection, if the wireless router is connected to an ADSL line or other Internet lines, it is also called a "hot spot".

WLAN and WiFi are actually the same in practical applications, but one refers to wireless connection technology and the other is the way of connection.

Bluetooth is a radio technology that supports short-range communication between devices (typically within 10 meters).

Wi-Fi is a technology that allows terminals such as PCs and handheld devices (such as PDAs and mobile phones) to be wirelessly connected to each other. Wi-Fi is a brand of wireless network communication technology owned by the Wi-Fi Alliance. The aim is to improve interoperability between wireless network products based on IEEE standards.

Nowadays, most people confuse Wi-Fi and IEEE. Even equate Wi-Fi with wireless internet. Bluetooth, is a radio technology that supports short-distance communication between devices (generally within 10m) Bluetooth and wifi are both wireless communication network standards.

What they have in common is that they both work in the public frequency band.

The difference is that Bluetooth uses the FHSS (Frequency Hopping Spectrum Expansion) method, which generally jumps 1600 times per second, dividing the frequency band into 79 frequency band channels, and each moment only occupies 1MHz of bandwidth. The modulation mode is GFSK (Gaussian Frequency Shift Keying), which can carry out wireless communication of data and voice at the same time, and the communication distance is generally 10 meters, and the transmission distance of the latest version launched in April this year can reach 50 meters. Nowadays, Bluetooth functions can be integrated in various digital products, such as mobile phones, headphones, printers, keyboards and mice, cameras, etc., which are widely used.

The protocol used by WiFi is the LAN protocol, which has a transmission range of 100 meters and a maximum speed of 11Mbps, using DSSS (Straight Sequence Spread Spectrum) and QPSK or BPSK (Phase Shift Keying), and the bandwidth is 22MHz. It mainly provides wireless Internet access services, so it can often be seen in devices that need wireless mobile Internet access, such as notebooks, PDAs, smartphones, etc.

Another point, Bluetooth belongs to WPAN wireless personal area network, upstairs said about the same, that is, point-to-point. Wifi belongs to WLAN wireless LAN, a network mode in which multiple terminals transmit at the same time.

Hehe. I'll say.

There is only one thing in common.

It is. It's all wireless.

Difference 1: Bluetooth.

Infrared. Short transmission distance.

Bluetooth is generally limited to less than 10 meters.

Infrared is even shorter-circuited.

More than 1 meter is not good.

Radio is different.

The distance of a radio is generally measured in kilometers.

You know that China's War of Resistance Against Japanese Aggression is the first thing to talk about.

The communications soldier inside is carrying the radio equipment.

Different basis points2

Bluetooth infrared is generally used to transfer files at close range.

Radios are generally used for wireless conversations over long distances.

Difference point 3: The difference between Bluetooth and infrared.

Bluetooth transfer files are non-directional.

Simply put, there is no need to focus.

No matter how you move within a valid range of 10 meters, it will not affect the file transfer.

Infrared is different.

The IR transfer file is to be focused.

It's two points in a line.

And there can be no obstacle in between.

The distance should not exceed 1 meter.

Now the phone.

Bluetooth is standard.

As for infrared. It has been eliminated in the first two years.

That's my question to you.

It is also based on my understanding of yours.

Hope it works for you.