IEEE - Complex signal processing is not complex.pdf

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【文件名】:0666@52RD_IEEE - Complex signal processing is not complex.pdf
【格　式】:pdf
【大　小】:527K
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Abstract—Wireless systems often make use of the quadrature relationship
between pairs of signals to effectively cancel out-of-band
and interfering in-band signal components. The understanding of
these systems is often simplified by considering both the signals
and system transfer functions as “complex” quantities. The complex
approach is especially useful in highly integrated multistandard
receivers where the use of narrow-band fixed-coefficient filters
at the RF and high IF must be minimized. This paper first
presents a tutorial review of complex signal processing for wireless
applications. The review emphasizes a graphical and pictorial
description rather than an equation-based approach. Next, a
number of classical modulation architectures are described using
this formulation. Finally, more recent developments such as complex
filters, image-reject mixers, low-IF receivers, and oversampling
analog–digital converters are discussed.