What is China s third generation mobile communications?

1.Multi-antenna technology.

This means that the communication signal generated by either party will be emitted by multiple antennas. This method has many advantages over traditional single-antenna transmission. In the implementation process, diversity technology is mainly used, which is characterized by the fact that the transmitter does not need to analyze the signal, but the receiver decides which type of signal to receive.

Technology. For the Internet, the most important problem to be solved is the IP address.

The IPv4 technology used before was only 32 bits long and could only provide a maximum of 2 32 different IPs. In other words, a router device can only guarantee 2 32 users at the same time.

With the application of IPv6, the capacity of the address space increased to 2 128. Therefore, IPv6 technology can be called the key point of 4G communication.

3.Smart antenna technology.

Smart antennas are used in a wide range of applications. For example, 4G mobile phones have become an important communication tool for people's work, study and life. As an important technical point of 4G communication engineering technology, the working principle of smart antenna technology is very simple, that is, by writing a program, this group of programs becomes a group of antenna units, and the transmission direction of the signal can be obtained through the antenna unit.

1. OFDM (Orthogonal Frequency Division Multiple Access): OFDM is one of the basic modulation technologies of 4G. It divides the high-speed data signal into multiple low-speed sub-signals for transmission, which improves the transmission efficiency and anti-interference ability.

2. MIMO (Multiple-Input Multiple-Output): MIMO technology uses multiple transmitting and receiving antennas to increase the capacity and coverage of the signal, improving the data transmission rate and system performance.

3. LTE (Long Term Evolution): LTE is the main access technology standard for 4G, which adopts an all-IP (Internet Protocol) network architecture to provide higher bandwidth and lower latency.

In the third-generation mobile communication system, China Mobile China Electric-||Letter adopted by China Unicom.

In the third-generation mobile communication system, China Mobile China Electric-||China Unicom adopts the following technology, which is based on the second generation of mobile communication technology, which is based on broadband CDMA technology, and can simultaneously provide voice and data services for the mobile communication system, that is, the future mobile communication system, which is a generation capable of completely solving the problem.

The main drawbacks of the first and second generation mobile communication systems are the most preferred mobile communication systems. One of the outstanding features of the third-generation mobile communication system is that it is necessary to realize that individual end users can complete mobile communication and transmission of any information between any person at any time, any place, and in any way and with high quality in the future mobile communication system. It can be seen vertically that the third generation of mobile communication attaches great importance to the autonomy of individuals in the communication system, highlighting the main position of the individual in the communication system, so it is also called the future personal communication system.

At present, there are four third-generation mobile communication standards: CDMA2000 in the United States, WCDMA in Europe, TD-SCDMA and LAS-CDMA in China. From the perspective of technology development trend and business function, there are three standards based on the CDMA standard:

TDSCDMA, WCDMA, and CDMA2000 are considered to be the three mainstream application technology standards for 3G.

The three major standards have their own advantages in technology, at present, there will not be a certain standard with an "absolute advantage" to occupy a "dominant position" situation, so which standard can achieve a larger market share in the 3G era, in addition to the needs of market competition, the key also depends on the degree of compliance with market demand.