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扩频通信系统有许多用途,包括干扰抑制,多址联接,多径抑制,低概率监听传输,以及精密测距。所有的潜在用途中,扩频通信系统抗有意和无意干扰的能力大概是它的最大优点。当然,任何扩频接收机只能抑制定量的干扰,如果干扰电平变得太大,系统将起不到适当的作用。但是,即使在这后一种情况下,除了单纯地利用扩频技术本身自动改善系统性能外,还可应用其他一些技术来提高系统的性能。这些技术通常包括某些类型的附加信号处理,研究这些处理技术正是本文的目的。尤其是,对两种通用型窄带干扰抑制方案将进行深入的讨论并对若干其他技术也给出简要评述。本文着重讨论的两类抑制方案是1)基于最小均方估值技术和2)基于变换域处理结构的方案,
Spread spectrum communication system has many uses, including interference suppression, multiple access, multi-path suppression, low probability of monitoring transmission, and precision ranging. Among all potential uses, the ability of spread-spectrum communication systems to resist intentional and unintentional interference is probably its greatest strength. Of course, any spread-spectrum receiver can only suppress the quantitative interference, the system will not play a proper role if the interference level becomes too large. However, even in this latter case, there are several other techniques that can be used to improve system performance, besides simply using spread-spectrum techniques that automatically improve system performance. These techniques often include some type of additional signal processing, and it is the purpose of this article to study these processing techniques. In particular, two general types of narrowband interference suppression schemes will be discussed in depth and brief comments will be given on several other techniques. The two types of suppression schemes discussed in this paper are 1) based on the least square estimation technique and 2) the scheme based on transform domain processing structure,