Why Wi-Fi is faster than data record bluetooth module? Even though they are operate on the same frequency. And at the same time, let's figure out why wireless technologies can be safe using the ble system as an example. And find out what we can expect from the next generations of 6G and Wi-Fi 7?
We are already accustomed to transmitting data over the air: Wi-Fi, AirDrop, Bluetooth, and NFC. But have you ever wondered how it works? Why there are so many standards and how they don't conflict with each other. How does a YouTube video appear out of nowhere on your smartphone screen?
Radio, GPS, Bluetooth, 5G - all these technologies transmit data using electromagnetic waves. But how do they do it?
A simple example: if you throw a stone into the water, waves appear - this is a kind of perturbation of the water surface. And if a new electromagnetic field forms somewhere, it also perturbs the space around it in the same way and waves form then, data record bluetooth module works. And when we run an alternating current through the conductor, it perturbs the space alternately - this generates electromagnetic waves.
These waves propagate in airspace at the speed of light (about 300,000 km/s). And this is not surprising, because light is also an electromagnetic wave.
It's just that our eyes, as they evolved, became susceptible to a certain spectrum of electromagnetic radiation that comes from the sun data record bluetooth module works through these waves.
In addition to simple propagation in space, these waves can reflect or absorb by an object. Therefore, when the wave coming from the transmitter absorbs by the receiver antenna, an electrical impulse arises in it, the same as in the transmitter.
Therefore, if we intelligently encode these electromagnetic waves, we can transmit information through the air. But how exactly is the signal encoded?
Let's start with a very simple example, a radio signal. The very first type of radio signal coding that mankind came up with is amplitude modulation. Remember the letters AM on old radios. This is it - Amplitude modulation
Here is the principle of data record bluetooth module coding is elementary. It's like if we put a speaker in a pond: and a big wave would arise from loud fragments. Such a signal is very easy to transmit and decrypt.
True, he has a drawback - he is very sensitive to interference. In particular, therefore, amplitude modulation did not take root in broadcasting, and it was quickly replace by frequency modulation, better known to us as FM - Frequency modulation. Here the principle is similar, but instead of the amplitude, the oscillation frequency changes.
These were examples of analog signals, but a digital signal can also transmit using amplitude or frequency modulation.
This is even simpler and more reliable, because instead of a continuous analog signal, you just need to transmit zeros and ones. There is oscillation - no oscillation for amplitude modulation, high frequency - low frequency for frequency.
Naturally, now data record bluetooth module coding methods are much more inventive, in mobile communications and Wi-Fi, methods of orthogonal frequency division (OFDM), as well as quadrature amplitude modulation (QAM) use.
All this looks much more complicated, but I think you understand the basic principle: by the amplitude, frequency, phase of the carrier signal, we can encode a lot of information.
After all, in theory, a signal over the air can be easily intercepted.
Naturally, the signal encrypts. We did a separate article about how encryption works. We'll give you some good advice here. In the router settings, you need to select the type of protection and the type of encryption.
If WEP (Wired Equivalent Privacy) selects in your protection type, the code is red. This is not an up-to-date standard; it is easily hacked due to vulnerabilities.
As a protection, choose WPA of any version, but the latest WPA3 (Wi-Fi Protected Access) is better for data record bluetooth module.
Algorithms based on AES are also use in various security systems. For example, in an AJAX wireless security system, all transmits data protects. It uses its own noise-resistant communication protocol with AES encryption with a floating key. Therefore, hacking such a system will take an astronomically long time.
Okie-docks, we learned to transfer data through data record bluetooth module. But what determines the transfer rate? There are several factors.
First, it is the frequency of the signal. Everything seems to be simple here. It has higher the frequency, the higher the transmission rate. Because the more vibrations per second we can transmit, the more bits of information we can cram.
That is why new data record bluetooth module communication standards are moving to higher and higher frequencies.
For example, if from the first to the fourth generation of mobile networks, we somehow managed with frequencies from 750 to 2700 MHz and the maximum data transfer rate on 4G was 1 Gb / s, then with the advent of 5G, frequencies up to 30 GHz and higher began to use, which data record bluetooth module will allow increase the data transfer rate by 20 times.
So why not transmit all data at a frequency of 100 GHz or even higher? Let's just say there is a side effect.
High frequency improves data record bluetooth module speed but reduces coverage and reliability. This we understood. But does this mean that all standards that operate at the same frequency are the same in speed and reliability?
Of course not: the speed and coverage are also greatly affected by the power of the transmitter.
For example, Wi-Fi and Bluetooth operate on the same 2.4 GHz frequency. But at the same time, Wi-Fi hits further, and the speed is higher.
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