DTMB与5G NR兼容性研究

Research on the compatibility between DTMB and 5G NR

为了推动5G网络的快速发展,我国调整了700MHz频段的使用规划,将这段频谱重新规划用于移动通信系统,这段频谱是传统的广播电视频段,全国各地有许多广电业务已经在这段频谱中运营,需要搬移到其他频段。在搬移的过程中,不可避免地存在广电业务和移动业务在同一频道并存的情况。为了研究DTMB信号与5G NR信号在同一频道并存时的相互干扰问题,本文搭建了实验室测试DTMB信号受5G NR信号干扰的测试平台,并且测试了不同带宽的5G NR信号对两种模式的DTMB信号的同频干扰保护率和上、下邻频干扰保护率,并对测试结果进行了分析,结果表明,在同种模式下,不同带宽的5G NR信号在DTMB有效带宽内对DTMB信号的同频干扰保护率基本相同,其数值与相同模式下DTMB信号受DTMB信号同频干扰的保护率基本相同。在同种模式下,DTMB信号对来自上邻频的5G NR信号干扰保护率与下邻频干扰保护率基本一致,对比相同模式下DTMB信号受DTMB信号邻频干扰的保护率,上邻频保护率基本相同,下邻频保护率相差约6dB。这些结果对于研究在同一频段并存时DTMB信号受5G NR信号干扰的特性,有着重要作用。

In order to promote the rapid development of 5 G networks, China adjusted the use plan of the700 MHz 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 5 G NR signal coexist on the same channel, a laboratory test platform for testing DTMB signal interference by 5 G NR signal was built, and tested the co-channel interference, upper adjacent channel interference, and lower adjacent channel interference of 5 G NR signals with different bandwidths to the two modes of DTMB signals. The test results show that, in the same mode, 5 G 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 5 G 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 6 dB. These results play an important role in studying the characteristics of DTMB signals interfered by 5 G NR signals when coexisting in the same frequency band.