China Aerospace Science and Industry Second Academy has completed the country's first real-time wireless transmission of terahertz orbital angular momentum in Beijing, a breakthrough that will provide important support for the development of 6G communication technology in China, according to the institute 25.

 

It is reported that this experiment uses high precision helical phase plate antenna to realize 4 different beam modes in 110GHz band, and achieves 100Gbps wireless real-time transmission on 10GHz transmission bandwidth through the synthesis of 4 modes, which maximizes the bandwidth utilization rate.

 

                                                                              

 

 

Wireless backpass is the key technology of connecting base station and core network equipment in mobile backpass network. With the increasing demand of communication rate, the mobile communication frequency band is extended to millimeter wave and higher terahertz frequency band, the signal transmission loss increases greatly, and the deployment density of base station will increase exponentially. In the 5G/6G communication era with "highly dense" base stations, traditional fiber-based bearer network transmission will face high cost, long deployment cycle, poor flexibility and other problems, and wireless backtransmission technology will gradually occupy a dominant position. Studies have pointed out that in 2023, the proportion of base stations using wireless backpass will reach more than 62% worldwide.

 

As a new spectrum technology, terahertz communication has gradually become one of the key technologies of 6G communication, which can provide a larger transmission bandwidth and meet the needs of higher transmission rates. In the future, the peak rate of 6G communication will reach 1Tbps, so it is necessary to further improve the utilization rate under the existing spectrum resources to achieve higher wireless transmission capability.

 

It is reported that since 2021, 25 Institute aims at the hot demand of 6G communication, closely follows the forefront of international communication technology, chooses terahertz orbital angular momentum communication as a new breakthrough direction, realizes multiplex signal multiplexing transmission in terahertz frequency band, completes the super-large capacity data transmission, and improves the spectrum utilization rate by more than two times. In the future, the technology can also be used for short-range broadband transmission of 10 meters to 1 kilometer, providing support for high-speed transmission between lunar and fire exploration landers and cruisers, and cable-free bus transmission inside space vehicles.