As a common co-channel interference overlapping on spread spectrum, the effect of Narrow-Band Interference (NBI) could not be neglectable. Although spread spectrum systems could suppress NBI themselves to a certain extent, the effective rejection techniques used for NBI suppression would enhance the performance greatly. Over the past 30 years, the focus of NBI suppression has shifted from the single-user Direct Sequence Spread Spectrum (DSSS) systems to the multi-user Code-Division Multiple-Access (CDMA) systems. From the aspects of prediction, transform domain and Code-Aided techniques, this paper provides tutorial overview of current status,category comparison and development trend on NBI suppression of DSSS and CDMA systems.%窄带干扰(NBI,Narrow-Band Interference)作为一类常见的共道干扰对扩频系统的影响不容忽视,虽然扩频系统本身具备一定的NBI对抗能力,但有效的NBI抑制技术可以显著提高系统性能.在过去的30年中,扩频系统NBI抑制技术的关注重心由单用户直扩(DSSS,Direct Sequence Spread Spectrum)系统扩展到多用户码分多址(CDMA,Code-Division Multiple-Access)系统.文章从预测技术、变换域技术、码辅助技术的角度对DSSS和CDMA系统NBI抑制技术的研究现状、分类比较以及发展趋势进行了全面概述.
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