Key technologies of LTE systems.
With the rapid development of the mobile Internet, users have higher and higher requirements for data transmission rate and spectrum efficiency. To meet these needs, key technologies such as OFDM and MIMO have been introduced into LTE systems, and the application of these technologies has significantly improved spectral efficiency and data transmission rates.
Orthogonal frequency-division multiplexing (OFDM) is a multi-carrier modulation technique that disperses high-speed data streams across multiple quadrature subcarriers, thereby improving spectral efficiency and data transmission rates. At the same time, OFDM technology also has strong anti-multipath interference ability, which can maintain high transmission performance in complex wireless environments.
The multiple-input, multiple-output (MIMO) technology uses multiple antennas to achieve spatial multiplexing and diversity, thereby improving the channel capacity and reliability of the system. By using multiple antennas at both the transmitter and receiver ends, MIMO technology is able to exponentially increase data rates and spectral efficiency without increasing spectrum resources.
In addition to OFDM and MIMO technologies, LTE systems support a variety of bandwidth allocation methods, including 14MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz, etc. This flexible bandwidth allocation method allows operators to flexibly configure LTE networks according to actual needs and scenarios, thereby improving spectrum utilization and network performance.
In addition, the LTE system supports mainstream 2G and 3G bands as well as some new frequency bands, which allows operators to deploy LTE networks more flexibly and make full use of existing infrastructure. At the same time, this spectrum allocation method also significantly improves the capacity and coverage of LTE systems.
In summary, the key technologies of LTE systems include OFDM, MIMO, multiple bandwidth allocation methods, and flexible spectrum allocation. The application of these technologies makes LTE systems have significant advantages in spectrum efficiency, data transmission rate, system capacity and coverage, and thus become an important development direction of future mobile communication systems.