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随着信息技术和网络技术的快速发展,广播电视的发展重心由普通接收转到移动接收。目前我国科学技术的水平在一定程度上可以解决广播移动接收技术,广播的移动接收比电视的移动接收更容易,但是技术的落后、更新缓慢是移动接收发展困难的原因之一。移动接收的关键技术是OFDM,OFDM的特点是各子载波相互正交,扩频调制后的频谱可相互重叠,不但减少了子载波间的相互干扰,还使得频谱利用率得到很大提高。本文主要探讨广播电视面临的问题和主要技术。
With the rapid development of information technology and network technology, the focus of the development of radio and television has shifted from normal reception to mobile reception. At present, the level of science and technology in our country can solve the broadcast mobile reception technology to a certain extent. The mobile reception of broadcasting is easier than the mobile reception of television. However, the backward and slow updating of technology is one of the reasons why mobile reception is difficult to develop. The key technology of mobile reception is OFDM. The characteristic of OFDM is that the subcarriers are orthogonal to each other, and the spectrum after the spread spectrum modulation can overlap with each other, which not only reduces mutual interference between subcarriers but also greatly improves spectrum utilization. This article mainly discusses the problems and main technologies of radio and television.