摘要
作为一种解决码间干扰的有效手段,正交频分复用技术(OFDM)已成为各种数据通信标准诸如AD-SL(DMT)、数字音频/视频广播(DAB/DVB)的核心技术,但是脉冲噪声影响仍然是限制其应用的一个重要问题。文中分析了几种DVB系统脉冲噪声抑制算法,对输入解调器前的数字信号进行非线性处理,以限制脉冲噪声的幅度。仿真表明,对输入信号中幅度较大的样值点进行限幅比置零效果更好。
Orthogonal frequency division multiplexing （OFDM） , which is inherently resistant to inter-symbol interference （ISI）, has been accepted as core technique in various voice/data communication standards such as ADSL and DAB/DVB, however, the effect of impulse noise is still a significant problem in its application. A number of impulse noise mitigation algorithms of DVB system, which are based on nonlinear operation, are analyzed in this paper. Simulation shows that the most effective nonlinearity is clipping of input signal samples with large amplitudes.
出处
《舰船科学技术》
北大核心
2006年第1期59-61,共3页
Ship Science and Technology
基金
国家自然科学基金资助项目(60172029)
