A chart shows how 5G is better than 4G, with a challenge

灞波儿奔

A chart shows how 5G is better than 4G, with a challenge [Copy link]

The word "5G" is often encountered these days, such as "Huawei's 5G technology is leading, and others will catch up in 2 to 3 years", "Trump urges the United States to step up 5G/6G", and yesterday's "Ministry of Industry and Information Technology issued 4 5G commercial licenses", "China enters the first year of 5G", etc.

So how is the fifth generation of mobile communication technology (5G) better than the current 4G? See the figure below.

The above figure shows that 5G is superior to 4G in all performance indicators, but there is a "challenge", that is, a "hidden" hero in maintaining fairness in the college entrance examination: signal jammers. The development of technology has provided convenience for those who use technology to cheat, but also posed challenges to the other party. The contest between spear and shield will not stop.

Warm reminder: Today is the first day of the college entrance examination. If you find that your mobile phone signal is poor at home, don’t panic and don’t blame the operator. It may be that your home is near the school and the signal is blocked.

Generally, signal shielding in examination rooms does not mean turning off nearby base stations, but installing signal blockers in the examination rooms, which falls into the category of communication interference. Since the frequency bands allocated by major operators are known, mobile phone signal blockers only need to ensure that communication signals are shielded within a certain small range. After all, the interference source is in the protection area, which has a great power advantage.

There are many communication interference technologies, such as broadband noise interference, partial frequency band noise interference, multi-tone interference, sweep frequency interference, tracking interference, smart interference and so on.

Modern communication technology uses advanced anti-interference technology, such as frequency hopping, direct sequence spread spectrum (DSSS) and other technologies, but the suppression of interference by frequency hopping and spread spectrum mainly depends on intermediate frequency filtering. However, since the front-end high-frequency amplifier and mixer are nonlinear devices, they will deteriorate when there is strong interference, that is, the RF front-end will be blocked. Therefore, generally speaking, as long as the frequency band can be covered, it is easier to interfere.

In addition to mobile phone signals, the jammer should also consider the WIFI frequency bands of 2.4~2.4835GHz and 5.735~5.835GHz.

In addition, if there is illegal homemade radio transceiver equipment that uses the frequency band maliciously, then drones equipped with radio detection equipment will be deployed to locate the radiation source and catch the perpetrators in the act.

When 5G is commercially available, the signal jammers should also be upgraded next year! Basically, they need to cover the frequency band below 6GHz, and the millimeter wave band needs to cover 24.25~42.5GHz, which is a big challenge.

There is nothing wrong with technology. Please do not use it for personal gain, but use it to benefit all mankind and build a "community with a shared future for mankind." This is a bit of a stretch, but I mainly want to say: I wish all candidates to get good grades, do not underestimate communication jamming technology, do not rely on luck, and do not take crooked paths.

btty038

Win with large quantity + wide bandwidth

strong161

In fact, if you really want to cheat and transmit information, you can consider using 24G and 77G directional transmission. The frequency is high and the direction is correct, so it can be less detected. It is an open frequency band for cars and cannot be blocked. Also, radio reconnaissance is useless. Many high-end cars have it. In addition, you can also use visible light communication, such as electric lights.

灞波儿奔

strong161 Published on 2019-6-8 14:13 In fact, if you really want to cheat and transmit information, consider using 24G and 77G directional transmission. The frequency is high and the direction is positive, which can reduce detection. It is also an open frequency band for automobiles, and there is no...

Well said, that's it.

alan000345

灞波儿奔 posted on 2019-6-9 22:17 Very well said, that's it

I learned something new.