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发明公开
CN101689881A 检测扩展频谱信号的存在 有权

检测扩展频谱信号的存在
摘要：
本发明涉及检测扩展频谱信号的存在。在接收器(10)中通过以下步骤来检测给定频率范围内扩展频谱信号的存在：接收信号；针对测量频率(ω 0 )确定指示信号；以及将该指示信号用作存在具有与所述测量频率(ω 0 )相等的载波频率(ω c )的扩展频谱信号的指示。通过将接收到的信号与具有所述测量频率(ω 0 )的振荡器信号进行混频来提供同相信号(B)和正交信号(C)；对这些信号中的至少一个进行相移；生成和信号(E)跟差信号(F)：以及将该和信号乘以该差信号并进行低通滤波。这样，就提供了一种在给定频率范围内检测扩展频谱信号的存在的方法和电路，其在被用于低成本认知无线电方面较简单且足够快。
摘要（英）：

The presence of spread spectrum signals in a given frequency range is detected in a receiver (10) by receiving a signal; determining for a measurement frequency (Omega o) an indication signal; and using it as an indication of the presence of spread spectrum signals having a carrier frequency (Omega c) equal to said measurement frequency (Omega o). An in-phase signal (B) and a quadrature signal (C) are provided by mixing the received signal with an oscillator signal having said measurement frequency (Omega o); at least one of these signals is phase shifted; a sum signal (E) and a difference signal (F) are generated; and the sum signal is multiplied by the difference signal and low pass filtered. In this way a method and a circuit of detecting the presence of spread spectrum signals in a given frequency range are provided, which are simple and fast enough to be used in low-cost cognitive radios.

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