One of the most frequent measurement tasks in radiocommunications is
the examination of signals in the frequency domain. Spectrum analyzers
required for this purpose are therefore among the most versatile and widely
used RF measuring instruments. Covering frequency ranges of up to 40
GHz and beyond, they are used in practically all applications of wireless
and wired communication in development, production, installation and
maintenance efforts. With the growth of mobile communications, parameters
such as displayed average noise level, dynamic range and frequency
range, and other exacting requirements regarding functionality
and measurement speed come to the fore. Moreover, spectrum analyzers
are also used for measurements in the time domain, such as measuring
the transmitter output power of time multiplex systems as a function of
time.
This book is intended to familiarize the uninitiated reader with the field of
spectrum analysis. To understand complex measuring instruments it is
useful to know the theoretical background of spectrum analysis. Even for
the experienced user of spectrum analyzers it may be helpful to recall
some background information in order to avoid measurement errors that
are likely to be made in practice.
In addition to dealing with the fundamentals, this book provides an insight
into typical applications such as phase noise and channel power
measurements.
Thanks: 
Fundamentals of Spectrum Analysis
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