Abstract
In this chapter, other spectrum estimation approaches are introduced that will be referred to as high-resolution spectrum estimations. Their major advantage is that they can provide higher frequency resolution than the FFT, especially on simultaneous signals. If there are two signals with frequencies very close, an FFT operation may generate one peak containing both signals. High-resolution spectrum estimation may separate the two signals by generating two sharp peaks. The major drawback of applying high-resolution spectrum estimation to digital microwave receivers is the complexity of the operation. Because of the large number of operations required to estimate the frequencies, this type of estimation will probably not be implemented for real-time application in the near future. However, it might be implemented for special applications. For example, if the peak of an FFT output appears to contain more than one signal, high-resolution spectrum estimation might be used to find the frequencies, thus the operation may not be required on all the input data.
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