英文摘要：
In order to promote the rapid development of 5G networks, China adjusted the use plan of the 700MHz frequency band and re-planned this section of spectrum for use in mobile communication systems. This section of the spectrum is a traditional broadcast television frequency band. Many broadcast television services across the country are already operating on this section of the spectrum and need to be transferred to other frequency bands. In the process of transfer, it is inevitable that broadcast television services and mobile services coexist on the same channel. In order to study the problem of mutual interference when DTMB signal and 5G NR signal coexist on the same channel, a laboratory test platform for testing DTMB signal interference by 5G NR signal was built, and tested the co-channel interference, upper adjacent channel interference, and lower adjacent channel interference of 5G NR signals with different bandwidths to the two modes of DTMB signals. The test results show that, in the same mode, 5G NR signals of different bandwidths have basically the same protection rate for co-channel interference to DTMB signals within the effective bandwidth of DTMB, and its value is basically the same as the protection rate of DTMB signal interfered with by DTMB signal in the same mode. In the same mode, the DTMB signal interference protection rate for 5G NR signals from the upper adjacent channel is basically the same as the lower adjacent channel interference protection rate. Comparing the protection rate of the DTMB signal interfered by the adjacent channel of the DTMB signal in the same mode, the protection rate of the upper adjacent channel is basically the same, and the difference of the protection rate of the lower adjacent channel is about 6dB. These results play an important role in studying the characteristics of DTMB signals interfered by 5G NR signals when coexisting in the same frequency band.
|